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Hong Y, Yeon S, Jeong J, Moon D, You T. Rare earth
metal‐doped Zintl phase thermoelectric materials: The
Yb
5−
x
RE
x
Al
2
Sb
6
(
RE
=Pr, Nd, Sm) system. B KOREAN CHEM SOC 2022. [DOI: 10.1002/bkcs.12609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yeongjin Hong
- Department of Chemistry and BK21 Four Research Team Chungbuk National University Cheongju Republic of Korea
| | - Seongbeom Yeon
- Department of Chemistry and BK21 Four Research Team Chungbuk National University Cheongju Republic of Korea
| | - Jiwon Jeong
- Department of Chemistry and BK21 Four Research Team Chungbuk National University Cheongju Republic of Korea
| | - Dohyun Moon
- Beamline Department Pohang Accelerator Laboratory Pohang Republic of Korea
| | - Tae‐Soo You
- Department of Chemistry and BK21 Four Research Team Chungbuk National University Cheongju Republic of Korea
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2
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Shang R, Nguyen AT, He A, Kauzlarich SM. Crystal structure characterization and electronic structure of a rare-earth-containing Zintl phase in the Yb-Al-Sb family: Yb 3AlSb 3. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2021; 77:281-285. [PMID: 34089251 DOI: 10.1107/s2053229621005192] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 05/14/2021] [Indexed: 11/10/2022]
Abstract
A rare-earth-containing compound, ytterbium aluminium antimonide, Yb3AlSb3 (Ca3AlAs3-type structure), has been successfully synthesized within the Yb-Al-Sb system through flux methods. According to the Zintl formalism, this structure is nominally made up of (Yb2+)3[(Al1-)(1b - Sb2-)2(2b - Sb1-)], where 1b and 2b indicate 1-bonded and 2-bonded, respectively, and Al is treated as part of the covalent anionic network. The crystal structure features infinite corner-sharing AlSb4 tetrahedra, [AlSb2Sb2/2]6-, with Yb2+ cations residing between the tetrahedra to provide charge balance. Herein, the synthetic conditions, the crystal structure determined from single-crystal X-ray diffraction data, and electronic structure calculations are reported.
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Affiliation(s)
- Rongqing Shang
- Department of Chemistry, University of California Davis, 1 Shields Ave, Davis, CA 95616, USA
| | - An T Nguyen
- Department of Chemistry, University of California Davis, 1 Shields Ave, Davis, CA 95616, USA
| | - Allan He
- Department of Chemistry, University of California Davis, 1 Shields Ave, Davis, CA 95616, USA
| | - Susan M Kauzlarich
- Department of Chemistry, University of California Davis, 1 Shields Ave, Davis, CA 95616, USA
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3
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Lee J, Shin S, Jo H, Shin WH, Moon D, Ok KM, You TS. Two Steps to Improve the Thermoelectric Performance of the Ca 5-xYb xAl 2-yIn ySb 6 System. Inorg Chem 2020; 59:13572-13582. [PMID: 32876437 DOI: 10.1021/acs.inorgchem.0c01944] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of quaternary and quinary Zintl phase thermoelectric (TE) compounds, Ca5-xYbxAl2-yInySb6 (3.07(1) ≤ x ≤ 4.88(2); 0.16(2) ≤ y ≤ 2.00), containing Al/In mixed sites as well as Ca/Yb mixed sites has been successfully synthesized by a direct arc-melting method, and the X-ray diffraction analyses indicated that the products initially adopted an orthorhombic Ba5Al2Bi6-type structure (space group Pbam, Z = 2). However, after a postannealing process at 973 K for 1 month, the particular Yb rich compounds underwent a transformation of the original structure type to a Ca5Ga2Sb6-type phase regardless of the In substitution for Al. The noticeable site preference of cationic Ca and Yb in the three available cationic sites could be understood on the basis of a size match between the central cation and the volume of the anionic polyhedra. The observed phase transition was nicely explained by DFT calculations, proving that the Ca5Ga2Sb6-type phase was energetically more favorable than the Ba5Al2Sb6-type phase for the particular Yb-rich compound. Moreover, this energy difference between the two title phases was originally the result of both the site energy in the Ca site and the bond energies in the [(Al/In)2Sb8] anionic building blocks. A series of thermoelectric property data indicated that a two-step process involving a partial/full In substitution for Al and a phase transition from the Ba5Al2Sb6-type to the Ca5Ga2Sb6-type phase successfully enhanced the electrical conductivities and the Seebeck coefficients of the title compounds. This kind of combined effect eventually resulted in a ZT improvement for the quinary compound Ca1.14(2)Yb3.86Al1.68(1)In0.32Sb6 by approximately 4 times in comparison to its quaternary predecessor Ca1.55(1)Yb3.45Al2Sb6.
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Affiliation(s)
- Junsu Lee
- Department of Chemistry and BK21Plus Research Team, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea
| | - Seungeun Shin
- Department of Chemistry and BK21Plus Research Team, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea
| | - Hongil Jo
- Department of Chemistry, Sogang University, Seoul 04107, Republic of Korea
| | - Weon Ho Shin
- Department of Electronic Materials Engineering, Kwangwoon University, Seoul 01897, Republic of Korea
| | - Dohyun Moon
- Beamline Department, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, Republic of Korea
| | - Kang Min Ok
- Department of Chemistry, Sogang University, Seoul 04107, Republic of Korea
| | - Tae-Soo You
- Department of Chemistry and BK21Plus Research Team, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea
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4
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Baranets S, Darone GM, Bobev S. Synthesis and structure of Sr14Zn1+As11 and Eu14Zn1+As11 (x ≤ 0.5). New members of the family of pnictides isotypic with Ca14AlSb11, exhibiting a new type of structural disorder. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.120990] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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5
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Five new ternary indium-arsenides discovered. Synthesis and structural characterization of the Zintl phases Sr3In2As4, Ba3In2As4, Eu3In2As4, Sr5In2As6 and Eu5In2As6. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.07.050] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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6
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Lim SJ, Nam G, Shin S, Ahn K, Lee Y, You TS. Anionic Doping and Cationic Site Preference in CaYb 4Al 2Sb 6- xGe x ( x = 0.2, 0.5, 0.7): Origin of the Enhanced Seebeck Coefficient and the Structural Transformation. Inorg Chem 2019; 58:5827-5836. [PMID: 30985118 DOI: 10.1021/acs.inorgchem.9b00181] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Three Zintl phase compounds belonging to the CaYb4Al2Sb6- xGe x ( x = 0.2, 0.5, 0.7; nominal compositions) system with various Ge-doping contents were successfully synthesized by arc-melting and were initially crystallized in the Ba5Al2Bi6-type phase (space group Pbam, Pearson codes oP26). However, after post-heat treatment at an elevated temperature, the originally obtained crystal structure was transformed into the homeotypic Ca5Ga2Sb6-type structure according to powder and single-crystal X-ray diffraction analyses. Two types of crystal structures share some isotypic structural moieties, such as the one-dimensional anionic chains formed by ∞1[Al2Sb8] and the void-filling Ca2+/Yb2+ mixed cations, but the slightly different spatial arrangements in each unit cell make these two structural types distinguishable. This series of title compounds is originally investigated to examine whether anionic p-type doping using Ge can successfully enhance thermoelectric (TE) properties of the Yb-rich CaYb4Al2Sb6- xGe x series even after the phase transition from the Ba5Al2Bi6-type to the Ca5Ga2Sb6-type phase. More interestingly, we also reveal that the given structural transformation is triggered by the particularly different site-preference of Ca2+ and Yb2+ among three available cationic sites in each structure type, which is significantly affected by thermodynamic conditions of this system. Band structure and density of states analyses calculated by density functional theory using the tight-binding linear muffin-tin orbital method also prove that the Ge-doping actually increases band degeneracies and the number of resonant peaks near the Fermi level resulting in the improvement of Seebeck coefficients. Electron localization function analyses for the (0 1 0) sliced-plane and the 3D isosurface nicely illustrates the distortion of the paired-electron densities due to the introduction of Ge. The systematic TE property measurements imply that the attempted anionic p-type doping is indeed effective to improve the TE characteristics of the title CaYb4Al2Sb6- yGe y system.
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Affiliation(s)
- Sung-Ji Lim
- Department of Chemistry and BK21Plus Research Team , Chungbuk National University , Cheongju , Chungbuk 28644 , Republic of Korea
| | - Gnu Nam
- Department of Chemistry and BK21Plus Research Team , Chungbuk National University , Cheongju , Chungbuk 28644 , Republic of Korea
| | - Seungeun Shin
- Department of Chemistry and BK21Plus Research Team , Chungbuk National University , Cheongju , Chungbuk 28644 , Republic of Korea
| | - Kyunghan Ahn
- Department of Applied Physics , Kyung Hee University , Yong-in 17104 , Republic of Korea
| | - Yunho Lee
- Department of Chemistry , Korea Advanced Institute of Science and Technology , Daejeon 34141 , Republic of Korea
| | - Tae-Soo You
- Department of Chemistry and BK21Plus Research Team , Chungbuk National University , Cheongju , Chungbuk 28644 , Republic of Korea
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7
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Feng Z, Wang Y, Yan Y, Zhang G, Yang J, Zhang J, Wang C. An impurity intermediate band due to Pb doping induced promising thermoelectric performance of Ca5In2Sb6. Phys Chem Chem Phys 2015; 17:15156-64. [PMID: 25991513 DOI: 10.1039/c5cp00972c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Band engineering is one of the effective approaches for designing ideal thermoelectric materials. Introducing an intermediate band in the band gap of semiconducting thermoelectric compounds may largely increase the carrier concentration and improve the electrical conductivity of these compounds. We test this hypothesis by Pb doping in Zintl Ca5In2Sb6. In the current work, we have systematically investigated the electronic structure and thermoelectric performances of substitutional doping with Pb on In sites at a doping level of 5% (0.2 e per cell) for Ca5In2Sb6 by using density functional theory combined with semi-classical Boltzmann theory. It is found that in contrast to Zn doping, Pb doping introduces a partially filled intermediate band in the band gap of Ca5In2Sb6, which originates from the Pb s states by weakly hybridizing with the Sb p states. Such an intermediate band dramatically increases the electrical conductivity of Ca5In2Sb6 and has little detrimental effect on its Seebeck coefficient, which may increase its thermoelectric figure of merit, ZT. Interestingly, a maximum ZT value of 2.46 may be achieved at 900 K for crystalline Pb-doped Ca5In2Sb6 when the carrier concentration is optimized. Therefore, Pb-doped Ca5In2Sb6 may be a promising thermoelectric material.
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Affiliation(s)
- Zhenzhen Feng
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
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8
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Jang E, Nam G, Woo H, Lee J, Han M, Kim S, You T. Lithium‐Filled Double‐Deck Layered Structure of the
RE
Li
x
Cu
2–
y
P
2
(
RE
= La, Pr, Nd, Gd, Er; 0.82 ≤
x
≤ 1; 1.19 ≤
y
≤ 1.54) Series: Experimental and Theoretical Studies. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500387] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Eunyoung Jang
- Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 361‐763, South Korea http://issmlab.chungbuk.ac.kr
| | - Gnu Nam
- Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 361‐763, South Korea http://issmlab.chungbuk.ac.kr
| | - Hyein Woo
- Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 361‐763, South Korea http://issmlab.chungbuk.ac.kr
| | - Junseong Lee
- Department of Chemistry, Chonnam National University, Gwangju, Chonnam 500‐757, South Korea
| | - Mi‐Kyung Han
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120‐750, South Korea
| | - Sung‐Jin Kim
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120‐750, South Korea
| | - Tae‐Soo You
- Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 361‐763, South Korea http://issmlab.chungbuk.ac.kr
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9
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Aydemir U, Zevalkink A, Ormeci A, Wang H, Ohno S, Bux S, Snyder GJ. Thermoelectric properties of the Zintl phases Yb5M2Sb6(M = Al, Ga, In). Dalton Trans 2015; 44:6767-74. [DOI: 10.1039/c4dt03773a] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Zintl compounds of Yb5M2Sb6(M = Al, Ga, and In) exhibit semimetallic properties with high p-type carrier concentrations, low resistivities and low Seebeck coefficients in agreement with our band structure calculations.
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Affiliation(s)
- Umut Aydemir
- Department of Applied Physics and Materials Science
- California Institute of Technology
- Pasadena
- USA
| | - Alex Zevalkink
- Thermal Energy Conversion Technologies Group
- Jet Propulsion Laboratory
- Pasadena
- USA
| | - Alim Ormeci
- Max Planck Institute for Chemical Physics of Solids
- Dresden
- Germany
| | - Heng Wang
- Department of Applied Physics and Materials Science
- California Institute of Technology
- Pasadena
- USA
| | - Saneyuki Ohno
- Department of Applied Physics and Materials Science
- California Institute of Technology
- Pasadena
- USA
| | - Sabah Bux
- Thermal Energy Conversion Technologies Group
- Jet Propulsion Laboratory
- Pasadena
- USA
| | - G. Jeffrey Snyder
- Department of Applied Physics and Materials Science
- California Institute of Technology
- Pasadena
- USA
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10
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Zevalkink A, Swallow J, Ohno S, Aydemir U, Bux S, Snyder GJ. Thermoelectric properties of the Ca5Al2−xInxSb6solid solution. Dalton Trans 2014; 43:15872-8. [DOI: 10.1039/c4dt02206h] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Zevalkink A, Takagiwa Y, Kitahara K, Kimura K, Snyder GJ. Thermoelectric properties and electronic structure of the Zintl phase Sr5Al2Sb6. Dalton Trans 2014; 43:4720-5. [DOI: 10.1039/c3dt53487a] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Subbarao U, Sarkar S, Gudelli VK, Kanchana V, Vaitheeswaran G, Peter SC. Yb5Ga2Sb6: a mixed valent and narrow-band gap material in the RE5M2X6 family. Inorg Chem 2013; 52:13631-8. [PMID: 24224906 DOI: 10.1021/ic402185s] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new compound Yb5Ga2Sb6 was synthesized by the metal flux technique as well as high frequency induction heating. Yb5Ga2Sb6 crystallizes in the orthorhombic space group Pbam (no. 55), in the Ba5Al2Bi6 structure type, with a unit cell of a = 7.2769(2) Å, b = 22.9102(5) Å, c = 4.3984(14) Å, and Z = 2. Yb5Ga2Sb6 has an anisotropic structure with infinite anionic double chains (Ga2Sb6)(10-) cross-linked by Yb(2+) and Yb(3+) ions. Each single chain is made of corner-sharing GaSb4 tetrahedra. Two such chains are bridged by Sb2 groups to form double chains of 1/∞ [Ga2Sb6(10-)]. The compound satisfies the classical Zintl-Klemm concept and is a narrow band gap semiconductor with an energy gap of around 0.36 eV calculated from the electrical resistivity data corroborating with the experimental absorption studies in the IR region (0.3 eV). Magnetic measurements suggest Yb atoms in Yb5Ga2Sb6 exist in the mixed valent state. Temperature dependent magnetic susceptibility data follows the Curie-Weiss behavior above 100 K and no magnetic ordering was observed down to 2 K. Experiments are accompanied by all electron full-potential linear augmented plane wave (FP-LAPW) calculations based on density functional theory to calculate the electronic structure and density of states. The calculated band structure shows a weak overlap of valence band and conduction band resulting in a pseudo gap in the density of states revealing semimetallic character.
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Affiliation(s)
- Udumula Subbarao
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research , Jakkur, Bangalore, 560064, India
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13
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Zevalkink A, Swallow J, Snyder GJ. Thermoelectric properties of Zn-doped Ca5In2Sb6. Dalton Trans 2013; 42:9713-9. [DOI: 10.1039/c3dt50428j] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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He H, Tyson C, Saito M, Bobev S. Synthesis, Crystal and Electronic Structures of the New Zintl phases Ba3Al3Pn5 (Pn = P, As) and Ba3Ga3P5. Inorg Chem 2012; 52:499-505. [DOI: 10.1021/ic302437t] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hua He
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United
States
| | - Chauntae Tyson
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United
States
| | - Maia Saito
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United
States
| | - Svilen Bobev
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United
States
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15
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Synthesis and structural characterization of the ternary Zintl phases AE3Al2Pn4 and AE3Ga2Pn4 (AE=Ca, Sr, Ba, Eu; Pn=P, As). J SOLID STATE CHEM 2012. [DOI: 10.1016/j.jssc.2012.01.042] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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16
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Peter SC, Malliakas CD, Nakotte H, Kothapilli K, Rayaprol S, Schultz AJ, Kanatzidis MG. The polygallides: Yb3Ga7Ge3 and YbGa4Ge2. J SOLID STATE CHEM 2012. [DOI: 10.1016/j.jssc.2012.01.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Peter SC, Kanatzidis MG. ThSi2 Type Ytterbium Disilicide and its Analogues YbTxSi2-x (T = Cr, Fe, Co). Z Anorg Allg Chem 2012. [DOI: 10.1002/zaac.201100284] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Wilson DK, Saparov B, Bobev S. Synthesis, Crystal Structures and Properties of the Zintl Phases Sr2ZnP2, Sr2ZnAs2, A2ZnSb2 and A2ZnBi2 (A = Sr and Eu). Z Anorg Allg Chem 2011. [DOI: 10.1002/zaac.201100177] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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He H, Stearrett R, Nowak ER, Bobev S. Gallium Pnictides of the Alkaline Earth Metals, Synthesized by Means of the Flux Method: Crystal Structures and Properties of CaGa2Pn2, SrGa2As2, Ba2Ga5As5, and Ba4Ga5Pn8 (Pn = P or As). Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100065] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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He H, Stearrett R, Nowak ER, Bobev S. BaGa2Pn2 (Pn = P, As): New Semiconducting Phosphides and Arsenides with Layered Structures. Inorg Chem 2010; 49:7935-40. [DOI: 10.1021/ic100940b] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hua He
- Department of Chemistry and Biochemistry
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22
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Toberer ES, May AF, Melot BC, Flage-Larsen E, Snyder GJ. Electronic structure and transport in thermoelectric compounds AZn2Sb2 (A = Sr, Ca, Yb, Eu). Dalton Trans 2010; 39:1046-54. [DOI: 10.1039/b914172c] [Citation(s) in RCA: 171] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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