scholarly journals Compressibility of the high-pressure rocksalt phase of ZnO

1998 ◽  
Vol 58 (14) ◽  
pp. 8949-8954 ◽  
Author(s):  
J. M. Recio ◽  
M. A. Blanco ◽  
V. Luaña ◽  
Ravindra Pandey ◽  
L. Gerward ◽  
...  
Keyword(s):  
High Pressure ◽  
Rocksalt Phase

Structural phase transitions in high-pressure wurtzite to rocksalt phase in GaN and SiC

2008 ◽  
Vol 92 (24) ◽  
pp. 241909 ◽  
Author(s):  
H. Y. Xiao ◽  
F. Gao ◽  
L. M. Wang ◽  
X. T. Zu ◽  
Y. Zhang ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Rocksalt Phase

Structural Evidence for a Fast-Ion Transition in the High-Pressure Rocksalt Phase of Silver Iodide

1996 ◽  
Vol 77 (24) ◽  
pp. 4914-4917 ◽  
Author(s):  
D. A. Keen ◽  
S. Hull ◽  
W. Hayes ◽  
N. J. G. Gardner
Keyword(s):  
High Pressure ◽  
Silver Iodide ◽  
Rocksalt Phase ◽  
Fast Ion

Spectroscopy of Semiconductor Nano-Crystals at High Pressure

1992 ◽  
Vol 272 ◽  
Author(s):  
John Schroeder ◽  
Markus R. Silvestri ◽  
Xue-Shu Zhao ◽  
Peter D. Persans ◽  
Lih-Wen Hwang
Keyword(s):  
High Pressure ◽  
Raman Scattering ◽  
Bulk Material ◽  
Semiconductor Nanocrystals ◽  
Electronic States ◽  
Wurtzite Phase ◽  
Glass Composites ◽  
Rocksalt Phase ◽  
Electron Phonon Coupling ◽  
Pressure Stability

ABSTRACTThe optical and vibrational properties of small CdSe and CdS particles embedded in a glass matrix and as a colloid have been studied as a function of pressure up to 90 kbar using Raman scattering and photoluminescence techniques. We will discuss the use of high pressure optical spectroscopy techniques, where the sample is contained in a diamond anvil.cell with optical access, to study the nature of the electronic states in semiconductor nanocrystals. Raman scattering is employed to establish the enhanced pressure stability of the wurtzite phase in the II-VI nanocrystalline composites. Photolurninescence is used to study the energies of electronic states. The wurtzite to rocksalt phase transition behavior in the nanocrystallite systems is quite different from that in the bulk material. This different behavior is attributed to a large number of defects (vacancies) in the nanocrystallite system. This work demonstrates that the main defects in the CdS glass composites are cadmium vacancies; while in CdSe Selenium vacancies exist in the conduction band. The pressure dependence of the Huang-Rhys parameter, characteristic for the strength of the electron-phonon coupling, will also be discussed for the nanocrystalline samples versus the bulk material.

scholarly journals High Pressure Equation of State for Nanomaterials

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Jeewan C. Bhatt ◽  
Kuldeep Kholiya ◽  
Ravindra Kumar
Keyword(s):  
Experimental Data ◽  
High Pressure ◽  
Equation Of State ◽  
Nanocrystalline Materials ◽  
Empirical Equation ◽  
Rutile Phase ◽  
Pressure Equation ◽  
Rocksalt Phase ◽  
Volume Compression ◽  
Volume Relation

Shanker Equation of State is used to study the volume compression of nanocrystalline materials under different pressure. On comparing with the experimental data it gives good results at low pressure, but for higher compression it deviates from the experimental points. Therefore, the Equation of State is modified empirically to study the pressure-volume relation for nanomaterials, namely, n-Rb3C60, n-CdSe (rocksalt phase), n-TiO2 (anatase and rutile phase), Fe-filled nanotube, and γ-Fe2O3, at high pressure. The results obtained from the empirical Equation of State are found to be in better agreement with the available experimental data.

The Theoretical Study of the Cinnabar-to-Rocksalt Phase Transitions of HgTe and CdTe under High Pressure

2014 ◽  
Vol 1004-1005 ◽  
pp. 1608-1614 ◽  
Author(s):  
Xi Duo Hu ◽  
De Hai Zhu ◽  
Zhi Feng Zeng ◽  
Shao Rui Sun
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Phase Transitions ◽  
Theoretical Study ◽  
Chain Structure ◽  
Two Phase ◽  
Principle Calculation ◽  
First Principle Calculation ◽  
First Order ◽  
Rocksalt Phase

We performed the first-principle calculation to study the structures of cinnabar phase and the Cinnabar-to-rocksalt Phase transitions of HgTe and CdTe under high pressure. The calculated results show that for HgTe, the zincblende-to-cinnabar phase transition is under 2.2GPa, and the cinnabar-to-rocksalt phase transition is under 5.5 GPa; For CdTe, the two phase transitions occur under 4.0 GPa and 4.9 GPa, respectively, which well agree with the experimental results. The cinnabar-to-rocksalt phase transitions of most compounds, including HgTe and CdTe, except HgS are of first-order, and it is due to that their cinnabar phases are not chain structure as HgS and there are no relaxation process before the phase transition.

Simulated Equations of State of ZnO with Rocksalt Phase at High Temperature and High Pressure

2007 ◽  
Vol 20 (2) ◽  
pp. 161-166 ◽  
Author(s):  
Yu-xiao Liu ◽  
Xiao-wei Sun ◽  
Ting Song ◽  
Cheng-wei Wang
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Equations Of State ◽  
Rocksalt Phase

High-pressure structure of gallium nitride: Wurtzite-to-rocksalt phase transition

1993 ◽  
Vol 47 (19) ◽  
pp. 12925-12928 ◽  
Author(s):  
Hui Xia ◽  
Qing Xia ◽  
Arthur L. Ruoff
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Gallium Nitride ◽  
Rocksalt Phase
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