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B M AK, Sarkar D, Guin SN. Room-Temperature Synthesis and Low Thermal Conductivity in Nanocrystalline Ag 3CuS 2. Inorg Chem 2024; 63:9078-9083. [PMID: 38701336 DOI: 10.1021/acs.inorgchem.4c00231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2024]
Abstract
Noble-metal-based chalcogenide materials recently gained massive attention in the field of thermoelectrics. In most cases, materials are synthesized using (i) high-temperature solid-state reactions or (ii) soft chemical methods where temperature requirements are lower than those of solid-state reactions (generally below 400 °C). Herein, we present a simple, surfactant-free, room-temperature, and energy-efficient synthesis of Ag3CuS2 nanocrystals. The present synthesis technique is scalable and capable of gram-scale production. A spark plasma sintering (SPS) pressed sample exhibits ultralow thermal conductivity (∼0.31 W/mK at room temperature). We found that Ag3CuS2 exhibits low sound velocity, as well as a non-Debye-like behavior based on a low-temperature heat capacity measurement. A high degree of anharmonicity of bonding, soft vibrations modes, and nanoscale grain boundary scattering in Ag3CuS2 lead to ultralow thermal conductivity, which can be important for thermoelectrics, optoelectronics, and thermal barrier coating applications.
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Affiliation(s)
- Anil Kumar B M
- Department of Chemistry, Birla Institute of Technology and Science, Pilani - Hyderabad Campus, Hyderabad 500078, India
| | - Debattam Sarkar
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur P.O., Bengaluru 560064, India
| | - Satya N Guin
- Department of Chemistry, Birla Institute of Technology and Science, Pilani - Hyderabad Campus, Hyderabad 500078, India
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2
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Thermal Analysis and Optimization of the Phase Diagram of the Cu-Ag Sulfide System. ENERGIES 2022. [DOI: 10.3390/en15020593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Thermal stabilities of selected ternary phases of industrial interest in the Ag-Cu-S system have been studied by the calorimetric and electromotive force techniques. The ternary compounds Ag1.2Cu0.8S (mineral mackinstryite) and AgCuS (mineral stromeyerite) were equilibrated through high-temperature reaction of the pure Cu2S and Ag2S in an inert atmosphere. The synthesized single solid sample constituting the two ternary phases was ground into fine powders and lightly pressed into pellets before calorimetric measurements. An electrochemical cell incorporating the two equilibrated phase and additional CuS as a cathode material was employed. The measurement results obtained with both techniques were analyzed and thermodynamic properties in the system have been determined and compared with the available literature values. Enthalpy of fusion data of the Ag-richer solid solution (Ag,Cu)2S have also been determined directly from the experimental data for the first time. The thermodynamic quantities determined in this work can be used to calculate thermal energy of processes involving the Ag-Cu-S-ternary phases. By applying the obtained results and the critically evaluated literature data, we have developed a thermodynamic database. The self-developed database was combined with the latest pure substances database of the FactSage software package to model the phase diagram of the Ag2S-Cu2S system.
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Kumar N, Guin SN, Manna K, Shekhar C, Felser C. Topological Quantum Materials from the Viewpoint of Chemistry. Chem Rev 2021; 121:2780-2815. [PMID: 33151662 PMCID: PMC7953380 DOI: 10.1021/acs.chemrev.0c00732] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Indexed: 11/29/2022]
Abstract
Topology, a mathematical concept, has recently become a popular and truly transdisciplinary topic encompassing condensed matter physics, solid state chemistry, and materials science. Since there is a direct connection between real space, namely atoms, valence electrons, bonds, and orbitals, and reciprocal space, namely bands and Fermi surfaces, via symmetry and topology, classifying topological materials within a single-particle picture is possible. Currently, most materials are classified as trivial insulators, semimetals, and metals or as topological insulators, Dirac and Weyl nodal-line semimetals, and topological metals. The key ingredients for topology are certain symmetries, the inert pair effect of the outer electrons leading to inversion of the conduction and valence bands, and spin-orbit coupling. This review presents the topological concepts related to solids from the viewpoint of a solid-state chemist, summarizes techniques for growing single crystals, and describes basic physical property measurement techniques to characterize topological materials beyond their structure and provide examples of such materials. Finally, a brief outlook on the impact of topology in other areas of chemistry is provided at the end of the article.
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Affiliation(s)
- Nitesh Kumar
- Max Planck Institute for
Chemical
Physics of Solids, 01187 Dresden, Germany
| | - Satya N. Guin
- Max Planck Institute for
Chemical
Physics of Solids, 01187 Dresden, Germany
| | - Kaustuv Manna
- Max Planck Institute for
Chemical
Physics of Solids, 01187 Dresden, Germany
| | - Chandra Shekhar
- Max Planck Institute for
Chemical
Physics of Solids, 01187 Dresden, Germany
| | - Claudia Felser
- Max Planck Institute for
Chemical
Physics of Solids, 01187 Dresden, Germany
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4
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Qu S, Wang Y, Xiao Y, Yuan Y, Li S, Chen J, Zhao L, Xia Z, Zhao J. Temperature-driven n-p conduction type switching without structural transition in a Cu-rich chalcogenide, NaCu 5S 3. Chem Commun (Camb) 2020; 56:4882-4885. [PMID: 32285903 DOI: 10.1039/d0cc01429j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report for the first time the discovery of reversible n-p conduction type switching in a chalcogenide, NaCu5S3, without structural transition. AC impedance and first-principles simulations of the ionic migration confirmed the local melting trends of the hexagonal copper lattice at high temperatures, which could result in superionic conductivity within NaCu5S3.
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Affiliation(s)
- Shangqing Qu
- The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing 100083, China. and Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing, 100094, China.
| | - Yonggang Wang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing, 100094, China.
| | - Yu Xiao
- School of Materials Science and Engineering, Beihang University, Beijing 100191, China
| | - Yujie Yuan
- The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
| | - Shengyi Li
- CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, China and School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jikun Chen
- The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
| | - Lidong Zhao
- School of Materials Science and Engineering, Beihang University, Beijing 100191, China
| | - Zhiguo Xia
- The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing 100083, China. and State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou, 510641, China
| | - Jing Zhao
- The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
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Morozova NV, Korobeinikov IV, Abrosimov NV, Ovsyannikov SV. Controlling the thermoelectric power of silicon–germanium alloys in different crystalline phases by applying high pressure. CrystEngComm 2020. [DOI: 10.1039/d0ce00672f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Si–Ge crystals are promising materials for use in various stress-controlled electronic junctions for next-generation nanoelectronic devices.
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Affiliation(s)
- Natalia V. Morozova
- M. N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences
- Yekaterinburg 620137
- Russia
| | - Igor V. Korobeinikov
- M. N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences
- Yekaterinburg 620137
- Russia
| | | | - Sergey V. Ovsyannikov
- Bayerisches Geoinstitut
- Universität Bayreuth
- Bayreuth
- Germany
- Institute for Solid State Chemistry of Ural Branch of Russian Academy of Sciences
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6
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Wen T, Wang Y, Li N, Zhang Q, Zhao Y, Yang W, Zhao Y, Mao HK. Pressure-Driven Reversible Switching between n- and p-Type Conduction in Chalcopyrite CuFeS 2. J Am Chem Soc 2018; 141:505-510. [PMID: 30484644 DOI: 10.1021/jacs.8b11269] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Temperature-dependent switching between p- and n-type conduction is a newly observed phenomenon in very few Ag-based semiconductors, which may promote fascinating applications in modern electronics. Pressure, as an efficient external stimulus that has driven collective phenomena such as spin-crossover and Mott transition, is also expected to initialize a conduction-type switching in transition metal-based semiconductors. Herein, we report the observation of a pressure-driven dramatic switching between p- and n-type conduction in chalcopyrite CuFeS2 associated with a structural phase transition. Under compression around 8 GPa, CuFeS2 undergoes a phase transition with symmetry breakdown from space group I-42 d to space group I-4 accompanying with a remarkable volume shrinkage of the FeS4 tetrahedra. A high-to-low spin-crossover of Fe2+ ( S = 2 to S = 0) is manifested along with this phase transition. Instead of pressure-driven metallization, a surprising semiconductor-to-semiconductor transition is observed associated with the structural and electronic transformations. Significantly, both photocurrent and Hall coefficient measurements confirm that CuFeS2 undergoes a reversible pressure-driven p- n conduction type switching accompanying with the structural phase transition. The absence of cationic charge transfer between copper and iron during the phase transition is confirmed by both X-ray absorption near-edge spectra (Cu/Fe, K-edge) and total-fluorescence-yield X-ray absorption spectra (Fe, K-edge) results, and the valence distribution maintains Cu2+Fe2+S2 in the high-pressure phase. The observation of an abrupt pressure-driven p- n conduction type switching in a transition metal-based semiconductor paves the way to novel pressure-responsive switching devices.
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Affiliation(s)
- Ting Wen
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
| | - Yonggang Wang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
| | - Nana Li
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
| | - Qian Zhang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
| | - Yongsheng Zhao
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
| | - Wenge Yang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
| | - Yusheng Zhao
- Department of Physics and Academy for Advanced Interdisciplinary Studies , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Ho-Kwang Mao
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China
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7
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Shi Y, Assoud A, Ponou S, Lidin S, Kleinke H. A New Material with a Composite Crystal Structure Causing Ultralow Thermal Conductivity and Outstanding Thermoelectric Properties: Tl 2Ag 12Te 7+δ. J Am Chem Soc 2018; 140:8578-8585. [PMID: 29909625 DOI: 10.1021/jacs.8b04639] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new state-of-the-art thermoelectric material, Tl2Ag12Te7+δ, which possesses an extremely low thermal conductivity of about 0.25 W m-1 K-1 and a high figure-of-merit of up to 1.1 at 525 K, was obtained using a conventional solid-state reaction approach. Its subcell is a variant of the Zr2Fe12P7 type, but ultimately its structure was refined as a composite structure of a Tl2Ag12Te6 framework and a linear Te atom chain running along the c axis. The super-space group of the framework was determined to be P63(00γ) s with a = b = 11.438(1) Å, c = 4.6256(5) Å, and that of the Te chain substructure has the same a and b axes, but c = 3.212(1) Å, space group P6(00γ) s. The modulation leads to the formation of Te2 and Te3 fragments in this chain and a refined formula of Tl2Ag11.5Te7.4. The structure consists of a complex network of three-dimensionally connected AgTe4 tetrahedra forming channels filled with the Tl atoms. The electronic structures of four different models comprising different Te chains, Tl2Ag12Te7, Tl2Ag12Te7.33, and 2× Tl2Ag12Te7.5, were computed using the WIEN2k package. Depending on the Te content within the chain, the models are either semiconducting or metallic. Physical property measurements revealed semiconducting properties, with an ultralow thermal conductivity, and excellent thermoelectric properties at elevated temperatures.
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Affiliation(s)
- Yixuan Shi
- Department of Chemistry and Waterloo Institute for Nanotechnology , University of Waterloo , Waterloo , Ontario , Canada N2L 3G1
| | - Abdeljalil Assoud
- Department of Chemistry and Waterloo Institute for Nanotechnology , University of Waterloo , Waterloo , Ontario , Canada N2L 3G1
| | - Simeon Ponou
- Polymer and Materials Chemistry , Lund University , Box 124, SE-22100 Lund , Sweden
| | - Sven Lidin
- Centre for Analysis and Synthesis, Department of Chemistry , Lund University , Box 124, SE-22100 Lund , Sweden
| | - Holger Kleinke
- Department of Chemistry and Waterloo Institute for Nanotechnology , University of Waterloo , Waterloo , Ontario , Canada N2L 3G1
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8
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Dutta M, Sanyal D, Biswas K. Tuning of p-n-p-Type Conduction in AgCuS through Cation Vacancy: Thermopower and Positron Annihilation Spectroscopy Investigations. Inorg Chem 2018; 57:7481-7489. [PMID: 29847926 DOI: 10.1021/acs.inorgchem.8b01246] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Understanding the complex phenomenon behind the structural transformations is a key requisite to developing important solid-state materials with better efficacy such as transistors, resistive switches, thermoelectrics, etc. AgCuS, a superionic semiconductor, exhibits temperature-dependent p-n-p-type conduction switching and a colossal jump in thermopower during an orthorhombic to hexagonal superionic transition. Tuning of p-n-p-type conduction switching in superionic compounds is fundamentally important to realize the correlation between electronic/phonon dispersion modulation with changes in the crystal structure and bonding, which might contribute to the design of better thermoelectric materials. Herein, we have created extrinsic Ag/Cu nonstoichiometry in AgCuS, which resulted in the vanishing of p-n-p-type conduction switching and improved its thermoelectric properties. We have performed the selective removal of cations and measured their temperature-dependent thermopower and Hall coefficient, which demonstrates only p-type conduction in the Ag1- xCuS and AgCu1- xS samples. The removal of Cu is much more efficient in arresting conduction switching, whereas in the case of Ag vacancy, p-n-p-type conduction switching vanishes at higher vacant concentrations. Positron annihilation spectroscopy measurements have been done to shed further light on the mechanisms behind this structural transition-dependent conduction switching. Cation (Ag+/Cu+) nonstoichiometry in AgCuS significantly increases the vacancy concentration, hence, the p-type carriers, which is confirmed by positron annihilation spectroscopy and Hall measurement. The Ag1- xCuS and AgCu1- xS samples exhibit ultralow thermal conductivity (∼0.3-0.5 W/m·K) in the 290-623 K temperature range because of the low-energy cationic sublattice vibration that arises as a result of the movement of loosely bound Ag/Cu within the stiff S sublattice.
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Affiliation(s)
- Moinak Dutta
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) , Jakkur P.O., Bangalore 560064 , India
| | - Dirtha Sanyal
- Variable Energy Cyclotron Centre , 1/AF Bidhannagar , Kolkata 700064 , India.,Homi Bhabha National Institute , Anushakti Nagar, Mumbai 400094 , India
| | - Kanishka Biswas
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) , Jakkur P.O., Bangalore 560064 , India
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9
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Roy P, Waghmare V, Tanwar K, Maiti T. Large change in thermopower with temperature driven p–n type conduction switching in environment friendly BaxSr2−xTi0.8Fe0.8Nb0.4O6 double perovskites. Phys Chem Chem Phys 2017; 19:5818-5829. [DOI: 10.1039/c6cp06273c] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Temperature driven p–n type conduction switching in combination with colossal change in thermo-power in BaxSr2−xTi0.8Fe0.8Nb0.4O6 (BSTFN) double perovskites.
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Affiliation(s)
- Pinku Roy
- Plasmonics and Perovskites Laboratory
- Department of Materials Science and Engineering
- Indian Institute of Technology Kanpur
- India
| | - Vikram Waghmare
- Plasmonics and Perovskites Laboratory
- Department of Materials Science and Engineering
- Indian Institute of Technology Kanpur
- India
| | - Khagesh Tanwar
- Plasmonics and Perovskites Laboratory
- Department of Materials Science and Engineering
- Indian Institute of Technology Kanpur
- India
| | - Tanmoy Maiti
- Plasmonics and Perovskites Laboratory
- Department of Materials Science and Engineering
- Indian Institute of Technology Kanpur
- India
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10
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Guin SN, Banerjee S, Sanyal D, Pati SK, Biswas K. Origin of the Order–Disorder Transition and the Associated Anomalous Change of Thermopower in AgBiS2 Nanocrystals: A Combined Experimental and Theoretical Study. Inorg Chem 2016; 55:6323-31. [DOI: 10.1021/acs.inorgchem.6b00997] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - Dirtha Sanyal
- Variable Energy Cyclotron Centre, 1/AF Bidhannagar, Kolkata 700064, India
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Guin SN, Sanyal D, Biswas K. The effect of order-disorder phase transitions and band gap evolution on the thermoelectric properties of AgCuS nanocrystals. Chem Sci 2016; 7:534-543. [PMID: 29896345 PMCID: PMC5952868 DOI: 10.1039/c5sc02966j] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Accepted: 10/07/2015] [Indexed: 11/21/2022] Open
Abstract
Copper and silver based chalcogenides, chalco-halides, and halides form a unique class of semiconductors, as they display mixed ionic and electronic conduction in their superionic phase. These compounds are composed of softly coupled cationic and anionic substructures, and undergo a transition to a superionic phase displaying changes in the substructure of their mobile ions with varying temperature. Here, we demonstrate a facile, ambient and capping agent free solution based synthesis of AgCuS nanocrystals and their temperature dependent (300-550 K) thermoelectric properties. AgCuS is known to show fascinating p-n-p type conduction switching in its bulk polycrystalline form. Temperature dependent synchrotron powder X-ray diffraction, heat capacity and Raman spectroscopy measurements indicate the observation of two superionic phase transitions, from a room temperature ordered orthorhombic (β) to a partially disordered hexagonal (α) phase at ∼365 K and from the hexagonal (α) to a fully disordered cubic (δ) phase at ∼439 K, in nanocrystalline AgCuS. The size reduction to the nanoscale resulted in a large variation in the thermoelectric properties compared to its bulk counterpart. Temperature dependent Seebeck coefficient measurements indicate that the nanocrystalline AgCuS does not display the p-n-p type conduction switching property like its bulk form, but remains p-type throughout the measured temperature range due to the presence of excess localized Ag vacancies. Nanocrystalline AgCuS exhibits a wider electronic band gap (∼1.2 eV) compared to that of the bulk AgCuS (∼0.9 eV), which is not sufficient to close the band gap to form a semimetallic intermediate state during the orthorhombic to hexagonal superionic phase transition, thus AgCuS nanocrystals do not show conduction type switching properties like their bulk counterpart. The present study demonstrates that ambient solution phase synthesis and size reduction to the nanoscale can tailor the order-disorder phase transition, the band gap and the electronic conduction properties in superionic compounds, which will not only enrich solid-state inorganic chemistry but also open a new avenue to design multifunctional materials.
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Affiliation(s)
- Satya N Guin
- New Chemistry Unit , Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) , Jakkur P.O. , Bangalore 560064 , India .
| | - Dirtha Sanyal
- Variable Energy Cyclotron Centre , 1/AF Bidhannagar , Kolkata 700064 , India
| | - Kanishka Biswas
- New Chemistry Unit , Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) , Jakkur P.O. , Bangalore 560064 , India .
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