Vibrational studies of hexagonal bronze systems: phonon calculation and high pressure induced phase transformation

2009 ◽  
Vol 40 (9) ◽  
pp. 1150-1157 ◽  
Author(s):  
J. Santos Coelho ◽  
W. Paraguassu ◽  
M. Maczka ◽  
A. G. Souza Filho ◽  
P.T.C. Freire ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
Vibrational Studies ◽  
Phonon Calculation

Elucidating the Phase Transformation and Metallization Behavior of Zinc Phosphide under High Pressure

2021 ◽  
Author(s):  
Yue Tang ◽  
Hao Liang ◽  
Shixue Guan ◽  
Mengyang Huang ◽  
Wenqiang Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
Zinc Phosphide

scholarly journals Pressure-Induced Structural Phase Transition and Metallization in Ga2Se3 up to 40.2 GPa under Non-Hydrostatic and Hydrostatic Environments

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 746
Author(s):  
Meiling Hong ◽  
Lidong Dai ◽  
Haiying Hu ◽  
Xinyu Zhang
Keyword(s):  
Phase Transition ◽  
Electrical Conductivity ◽  
High Pressure ◽  
Phase Transformation ◽  
Transport Properties ◽  
Electrical Transport ◽  
Structural Phase ◽  
Structure Evolution ◽  
Systematic Research ◽  
Electrical Transport Properties

A series of investigations on the structural, vibrational, and electrical transport characterizations for Ga2Se3 were conducted up to 40.2 GPa under different hydrostatic environments by virtue of Raman scattering, electrical conductivity, high-resolution transmission electron microscopy, and atomic force microscopy. Upon compression, Ga2Se3 underwent a phase transformation from the zinc-blende to NaCl-type structure at 10.6 GPa under non-hydrostatic conditions, which was manifested by the disappearance of an A mode and the noticeable discontinuities in the pressure-dependent Raman full width at half maximum (FWHMs) and electrical conductivity. Further increasing the pressure to 18.8 GPa, the semiconductor-to-metal phase transition occurred in Ga2Se3, which was evidenced by the high-pressure variable-temperature electrical conductivity measurements. However, the higher structural transition pressure point of 13.2 GPa was detected for Ga2Se3 under hydrostatic conditions, which was possibly related to the protective influence of the pressure medium. Upon decompression, the phase transformation and metallization were found to be reversible but existed in the large pressure hysteresis effect under different hydrostatic environments. Systematic research on the high-pressure structural and electrical transport properties for Ga2Se3 would be helpful to further explore the crystal structure evolution and electrical transport properties for other A2B3-type compounds.

Ductile mode material removal and high-pressure phase transformation in silicon during micro-laser assisted machining

2012 ◽  
Vol 36 (2) ◽  
pp. 364-367 ◽  
Author(s):  
Deepak Ravindra ◽  
Muralidhar K. Ghantasala ◽  
John Patten
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
Material Removal ◽  
High Pressure Phase ◽  
Laser Assisted Machining ◽  
Ductile Mode ◽  
Pressure Phase

Magnetic Characterization of SUS316L Deformed by High Pressure Torsion

2011 ◽  
Vol 239-242 ◽  
pp. 1300-1303
Author(s):  
Hong Cai Wang ◽  
Minoru Umemoto ◽  
Innocent Shuro ◽  
Yoshikazu Todaka ◽  
Ho Hung Kuo
Keyword(s):  
Plastic Deformation ◽  
High Pressure ◽  
Stainless Steel ◽  
Phase Transformation ◽  
Austenitic Stainless Steel ◽  
Volume Fraction ◽  
High Pressure Torsion ◽  
Austenitic Matrix ◽  
Magnetic Characterization

SUS316L austenitic stainless steel was subjected to severe plastic deformation (SPD) by the method of high pressure torsion (HPT). From a fully austenitic matrix (γ), HPT resulted in phase transformation from g®a¢. The largest volume fraction of 70% a¢ was obtained at 0.2 revolutions per minute (rpm) while was limited to 3% at 5rpm. Pre-straining of g by HPT at 5rpm decreases the volume fraction of a¢ obtained by HPT at 0.2rpm. By HPT at 5rpm, a¢®g reverse transformation was observed for a¢ produced by HPT at 0.2rpm.

Enhanced crystallization and phase transformation of amorphous silicon nitride under high pressure

2001 ◽  
Vol 16 (1) ◽  
pp. 67-75 ◽  
Author(s):  
Ya-Li Li ◽  
Yong Liang ◽  
Fen Zheng ◽  
Xian-Feng Ma ◽  
Suo-Jing Cui ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
Silicon Nitride ◽  
Amorphous Silicon ◽  
Crystallization Temperature ◽  
Amorphous Materials ◽  
Normal Pressure ◽  
Nucleation And Growth ◽  
Amorphous Silicon Nitride ◽  
Amorphous Si

The crystallization and phase transformation of amorphous Si3N4 ceramics under high pressure (1.0–5.0 GPa) between 800 and 1700 °C were investigated. A greatly enhanced crystallization and α–β transformation of the amorphous Si3N4 ceramics were evident under the high pressure, as characterized by that, at 5.0 GPa, the amorphous Si3N4 began to crystallize at a temperature as low as 1000 °C (to transform to a modification). The subsequent a–b transformation occurred completed between 1350 and 1420 °C after only 20 min of pressing at 5.0 GPa. In contrast, under 0.1 MPa N2, the identical amorphous materials were stable up to 1400 °C without detectable crystallization, and only a small amount of a phase was detected at 1500 °C. The crystallization temperature and the a–b transformation temperatures are reduced by 200–350 °C compared to that at normal pressure. The enhanced phase transformations of the amorphous Si3N4 were discussed on the basis of thermodynamic and kinetic consideration of the effects of pressure on nucleation and growth.

scholarly journals High pressure phase transformation in iron under fast compression

2009 ◽  
Vol 95 (24) ◽  
pp. 241911 ◽  
Author(s):  
Marina Bastea ◽  
Sorin Bastea ◽  
Richard Becker
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
High Pressure Phase ◽  
Pressure Phase

Microstructural evolution and phase transformation in twinning-induced plasticity steel induced by high-pressure torsion

2016 ◽  
Vol 109 ◽  
pp. 300-313 ◽  
Author(s):  
X.H. An ◽  
Q.Y. Lin ◽  
G. Sha ◽  
M.X. Huang ◽  
S.P. Ringer ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
Microstructural Evolution ◽  
High Pressure Torsion

High-pressure phase transformation of oriented CdSb single crystals

2005 ◽  
Vol 41 (3) ◽  
pp. 217-219 ◽  
Author(s):  
A. Yu. Mollaev ◽  
R. K. Arslanov ◽  
R. G. Dzhamamedov ◽  
S. F. Marenkin ◽  
S. A. Varnavskii
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
Single Crystals ◽  
High Pressure Phase ◽  
Pressure Phase

Phase transformation of BeSe and BeTe to the NiAs structure at high pressure

1995 ◽  
Vol 52 (10) ◽  
pp. 7058-7064 ◽  
Author(s):  
H. Luo ◽  
K. Ghandehari ◽  
R. G. Greene ◽  
A. L. Ruoff ◽  
S. S. Trail ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transformation
Sign in / Sign up

Export Citation Format

Share Document