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Jobbins SA, Boulfelfel SE, Leoni S. Metashooting: a novel tool for free energy reconstruction from polymorphic phase transition mechanisms. Faraday Discuss 2018; 211:235-251. [PMID: 30039129 DOI: 10.1039/c8fd00053k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
We introduce a novel scheme for the mechanistic investigation of solid-solid phase transitions, which we dub 'metashooting'. Combining transition path sampling, molecular dynamics and metadynamics, this scheme allows for both a complete mechanistic analysis and detailed mapping of the free energy surface. This is illustrated by performing metashooting calculations on the pressure-induced B4/B3 → B1 phase transition in ZnO. The resulting free energy map helps to clarify the role of intermediate configurations along this activated process and the competition between different mechanistic regimes with superior accuracy. We argue that metashooting can be efficiently applied to a broader class of activated processes.
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Wang Q, Li S, He Q, Zhu W, He D, Peng F, Lei L, Zhang L, Zhang Q, Tan L, Li X, Li X. Reciprocating Compression of ZnO Probed by X-ray Diffraction: The Size Effect on Structural Properties under High Pressure. Inorg Chem 2018; 57:5380-5388. [PMID: 29641188 DOI: 10.1021/acs.inorgchem.8b00357] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Zinc oxide, ZnO, an important technologically relevant binary compound, was investigated by reciprocating compress the sample in a diamond anvil cell using in situ high-pressure synchrotron X-ray diffraction at room temperature. The starting sample (∼200 nm) was compressed to 20 GPa and then decompressed to ambient condition. The quenched sample, with average grain size ∼10 nm, was recompressed to 20 GPa and then released to ambient condition. The structural stability and compressibility of the initial bulk ZnO and quenched nano ZnO were compared. Results reveal that the grain size and the fractional cell distortion have little effect on the structural stability of ZnO. The bulk modulus of the B4 (hexagonal wurtzites structure) and B1 (cubic rock salt structure) phases for bulk ZnO under hydrostatic compression were estimated as 164(3) and 201(2) GPa, respectively. Importantly, the effect of pressure in atomic positions, bond distances, and bond angles was obtained. On the basis of this information, the B4-to-B1 phase transformation was demonstrated to follow the hexagonal path rather than the tetragonal path. For the first time, the detail of the intermediate hexagonal ZnO, revealing the B4-to-B1 transition mechanism, was detected by experimental method. These findings enrich our knowledge on the diversity of the size influences on the high-pressure behaviors of materials and offer new insights into the mechanism of the B4-to-B1 phase transition that is commonly observed in many other wurzite semiconductor compounds.
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Affiliation(s)
- Qiming Wang
- National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics , Chinese Academy of Engineering Physics , Mianyang 621900 , China.,Institute of Atomic and Molecular Physics , Sichuan University , Chengdu 610065 , China
| | - Shourui Li
- National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics , Chinese Academy of Engineering Physics , Mianyang 621900 , China
| | - Qiang He
- National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics , Chinese Academy of Engineering Physics , Mianyang 621900 , China
| | - Wenjun Zhu
- National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics , Chinese Academy of Engineering Physics , Mianyang 621900 , China
| | - Duanwei He
- Institute of Atomic and Molecular Physics , Sichuan University , Chengdu 610065 , China
| | - Fang Peng
- Institute of Atomic and Molecular Physics , Sichuan University , Chengdu 610065 , China
| | - Li Lei
- Institute of Atomic and Molecular Physics , Sichuan University , Chengdu 610065 , China
| | - Leilei Zhang
- Institute of Atomic and Molecular Physics , Sichuan University , Chengdu 610065 , China
| | - Qiang Zhang
- Institute of Atomic and Molecular Physics , Sichuan University , Chengdu 610065 , China
| | - Lijie Tan
- Institute of Atomic and Molecular Physics , Sichuan University , Chengdu 610065 , China
| | - Xin Li
- Institute of Atomic and Molecular Physics , Sichuan University , Chengdu 610065 , China
| | - Xiaodong Li
- Institute of High Energy Physics , Chinese Academy of Sciences , Beijing 100049 , China
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Lin CM, Liu HT, Zhong SY, Hsu CH, Chiu YT, Tai MF, Juang JY, Chuang YC, Liao YF. Structural Transitions in Nanosized Zn 0.97Al 0.03O Powders under High Pressure Analyzed by in Situ Angle-Dispersive X-ray Diffraction. MATERIALS (BASEL, SWITZERLAND) 2016; 9:E561. [PMID: 28773683 PMCID: PMC5456907 DOI: 10.3390/ma9070561] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Revised: 06/28/2016] [Accepted: 07/07/2016] [Indexed: 11/16/2022]
Abstract
Nanosized aluminum-doped zinc oxide Zn1-xAlxO (AZO) powders (AZO-NPs) with x = 0.01, 0.03, 0.06, 0.09 and 0.11 were synthesized by chemical precipitation method. The thermogravimetric analysis (TGA) indicated that the precursors were converted to oxides from hydroxides near 250 °C, which were then heated to 500 °C for subsequent thermal processes to obtain preliminary powders. The obtained preliminary powders were then calcined at 500 °C for three hours. The structure and morphology of the products were measured and characterized by angle-dispersive X-ray diffraction (ADXRD) and scanning electron microscopy (SEM). ADXRD results showed that AZO-NPs with Al content less than 11% exhibited würtzite zinc oxide structure and there was no other impurity phase in the AZO-NPs, suggesting substitutional doping of Al on Zn sites. The Zn0.97Al0.03O powders (A₃ZO-NPs) with grain size of about 21.4 nm were used for high-pressure measurements. The in situ ADXRD measurements revealed that, for loading run, the pressure-induced würtzite (B4)-to-rocksalt (B1) structural phase transition began at 9.0(1) GPa. Compared to the predicted phase-transition pressure of ~12.7 GPa for pristine ZnO nanocrystals of similar grain size (~21.4 nm), the transition pressure for the present A₃ZO-NPs exhibited a reduction of ~3.7 GPa. The significant reduction in phase-transition pressure is attributed to the effects of highly selective site occupation, namely Zn2+ and Al3+, were mainly found in tetrahedral and octahedral sites, respectively.
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Affiliation(s)
- Chih-Ming Lin
- Department of Applied Science, National Hsinchu University of Education, Hsinchu 30014, Taiwan.
| | - Hsin-Tzu Liu
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan.
- Chemical Systems Research Division, Chung-Shan Institute of Science & Technology, Taoyuan 32546, Taiwan.
| | - Shi-Yao Zhong
- Department of Applied Science, National Hsinchu University of Education, Hsinchu 30014, Taiwan.
| | - Chia-Hung Hsu
- Department of Applied Science, National Hsinchu University of Education, Hsinchu 30014, Taiwan.
| | - Yi-Te Chiu
- Department of Applied Science, National Hsinchu University of Education, Hsinchu 30014, Taiwan.
| | - Ming-Fong Tai
- Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan.
| | - Jenh-Yih Juang
- Department of Electrophysics, National Chiao Tung University, Hsinchu 33013, Taiwan.
| | - Yu-Chun Chuang
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan.
| | - Yen-Fa Liao
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan.
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Fan Z, Koster RS, Wang S, Fang C, Yalcin AO, Tichelaar FD, Zandbergen HW, van Huis MA, Vlugt TJH. A transferable force field for CdS-CdSe-PbS-PbSe solid systems. J Chem Phys 2014; 141:244503. [DOI: 10.1063/1.4904545] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Zhaochuan Fan
- Process and Energy Department, Delft University of Technology, Leeghwaterstraat 39, 2628 CB Delft,The Netherlands
| | - Rik S. Koster
- Debye Institute for Nanomaterials Science and Center for Extreme Matter and Emergent Phenomena, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands
| | - Shuaiwei Wang
- Institute of Nanostructured Functional Materials, Huanghe Science and Technology College, Zhengzhou, Henan 450006, China
| | - Changming Fang
- Debye Institute for Nanomaterials Science and Center for Extreme Matter and Emergent Phenomena, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands
| | - Anil O. Yalcin
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Frans D. Tichelaar
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Henny W. Zandbergen
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Marijn A. van Huis
- Debye Institute for Nanomaterials Science and Center for Extreme Matter and Emergent Phenomena, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands
| | - Thijs J. H. Vlugt
- Process and Energy Department, Delft University of Technology, Leeghwaterstraat 39, 2628 CB Delft,The Netherlands
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Sorokin AV, Zhukovskii YF, Purans J, Kotomin EA. The effect of Zn vacancies and Ga dopants on the electronic structure of ZnO:Ab initiosimulations. ACTA ACUST UNITED AC 2012. [DOI: 10.1088/1757-899x/38/1/012015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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