Raman scattering and absorption study of the high-pressure wurtzite to rocksalt phase transition of GaN

2004 ◽  
Vol 69 (23) ◽  
Author(s):  
M. P. Halsall ◽  
P. Harmer ◽  
P. J. Parbrook ◽  
S. J. Henley
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Raman Scattering ◽  
Absorption Study ◽  
Rocksalt Phase

High-pressure Raman Scattering and Optical Absorption Study of β-GeS2

1996 ◽  
Vol 198 (1) ◽  
pp. 533-537 ◽  
Author(s):  
Z. V. Popović ◽  
M. Holtz ◽  
K. Reimann ◽  
K. Syassen
Keyword(s):  
High Pressure ◽  
Optical Absorption ◽  
Raman Scattering ◽  
Absorption Study ◽  
Optical Absorption Study

Raman scattering studies on phase transition in barium sodium niobate at high pressure

1979 ◽  
Vol 29 (11) ◽  
pp. 779-783 ◽  
Author(s):  
S. Kojima ◽  
T. Nakamura ◽  
K. Asaumi ◽  
M. Takashige ◽  
S. Minomura
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Raman Scattering ◽  
Sodium Niobate

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.

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.

High-pressure Raman scattering and structural phase transition inYCrO4

2006 ◽  
Vol 74 (5) ◽  
Author(s):  
Y. W. Long ◽  
L. X. Yang ◽  
Y. Yu ◽  
F. Y. Li ◽  
R. C. Yu ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Raman Scattering ◽  
Structural Phase Transition ◽  
Structural 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

Experimental and theoretical evidence of the temperature-induced wurtzite to rocksalt phase transition in GaN under high pressure

2020 ◽  
Vol 102 (23) ◽  
Author(s):  
Bohdan Sadovyi ◽  
Małgorzata Wierzbowska ◽  
Svitlana Stelmakh ◽  
Silvia Boccato ◽  
Stanislaw Gierlotka ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Rocksalt Phase ◽  
Theoretical Evidence
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