The phenomenon of conversion polymorphism in Bi-containing metastable perovskites

2019 ◽  
Vol 55 (32) ◽  
pp. 4683-4686 ◽  
Author(s):  
Dmitry D. Khalyavin ◽  
Andrei N. Salak ◽  
Elena L. Fertman ◽  
Oleksandr V. Kotlyar ◽  
Edwin Eardley ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Irreversible Phase Transitions

The high-pressure stabilised BiFe1−yScyO3 perovskites exhibit annealing-stimulated irreversible phase transitions, which allows them to be obtained in different structural polymorphs.

scholarly journals High-Pressure Induced Phase Transitions in High-Entropy Alloys: A Review

Entropy ◽  
2019 ◽  
Vol 21 (3) ◽  
pp. 239 ◽  
Author(s):  
Fei Zhang ◽  
Hongbo Lou ◽  
Benyuan Cheng ◽  
Zhidan Zeng ◽  
Qiaoshi Zeng
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Future Research ◽  
High Entropy Alloys ◽  
High Entropy ◽  
New Class ◽  
Materials Research ◽  
The Stability ◽  
Irreversible Phase Transitions

High-entropy alloys (HEAs) as a new class of alloy have been at the cutting edge of advanced metallic materials research in the last decade. With unique chemical and topological structures at the atomic level, HEAs own a combination of extraordinary properties and show potential in widespread applications. However, their phase stability/transition, which is of great scientific and technical importance for materials, has been mainly explored by varying temperature. Recently, pressure as another fundamental and powerful parameter has been introduced to the experimental study of HEAs. Many interesting reversible/irreversible phase transitions that were not expected or otherwise invisible before have been observed by applying high pressure. These recent findings bring new insight into the stability of HEAs, deepens our understanding of HEAs, and open up new avenues towards developing new HEAs. In this paper, we review recent results in various HEAs obtained using in situ static high-pressure synchrotron radiation x-ray techniques and provide some perspectives for future research.

scholarly journals High-Pressure Spectroscopy Study of Zn(IO3)2 Using Far-Infrared Synchrotron Radiation

Crystals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 34
Author(s):  
Akun Liang ◽  
Robin Turnbull ◽  
Enrico Bandiello ◽  
Ibraheem Yousef ◽  
Catalin Popescu ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Synchrotron Radiation ◽  
Infrared Radiation ◽  
Room Temperature ◽  
Far Infrared ◽  
Low Pressure ◽  
Pressure Response ◽  
Spectroscopy Study ◽  
Far Infrared Radiation

We report the first high-pressure spectroscopy study on Zn(IO3)2 using synchrotron far-infrared radiation. Spectroscopy was conducted up to pressures of 17 GPa at room temperature. Twenty-five phonons were identified below 600 cm−1 for the initial monoclinic low-pressure polymorph of Zn(IO3)2. The pressure response of the modes with wavenumbers above 150 cm−1 has been characterized, with modes exhibiting non-linear responses and frequency discontinuities that have been proposed to be related to the existence of phase transitions. Analysis of the high-pressure spectra acquired on compression indicates that Zn(IO3)2 undergoes subtle phase transitions around 3 and 8 GPa, followed by a more drastic transition around 13 GPa.

High-pressure phase transitions in AlSb

2001 ◽  
Vol 62 (5) ◽  
pp. 941-949 ◽  
Author(s):  
H. Hirano ◽  
S. Uehara ◽  
A. Mori ◽  
A. Onodera ◽  
K. Takemura ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
High Pressure Phase ◽  
Pressure Phase

Phase Transitions of Nematic Main-Chain Polyesters Under High Pressure

1988 ◽  
Vol 155 (1) ◽  
pp. 521-529 ◽  
Author(s):  
V. N. Raja ◽  
R. Shashidhar ◽  
S. Chandrasekhar ◽  
A. Blumstein ◽  
R. B. Blumstein ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Main Chain

Hydrostatic Deformation Potentials and Phase Transitions in CuGa(SxSe1−x)2 Alloys at High Pressure

1995 ◽  
Vol 187 (1) ◽  
pp. 149-156 ◽  
Author(s):  
J. González ◽  
E. Calderón ◽  
F. Capet
Keyword(s):  
High Pressure ◽  
Phase Transitions

scholarly journals Irreversible phase transitions induced by an oscillatory input

2000 ◽  
Vol 52 (1) ◽  
pp. 8-14 ◽  
Author(s):  
A. C López ◽  
G. P Saracco ◽  
E. V Albano
Keyword(s):  
Phase Transitions ◽  
Irreversible Phase Transitions

Crystal structure, compressibility and possible phase transitions in \boldvarepsilon-FeSi studied by first-principles pseudopotential calculations

1999 ◽  
Vol 55 (4) ◽  
pp. 484-493 ◽  
Author(s):  
Lidunka Vočadlo ◽  
Geoffrey D. Price ◽  
I. G. Wood
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Phase Transitions ◽  
First Principles ◽  
Stable Phase ◽  
Third Order ◽  
First Derivative ◽  
Pseudopotential Calculations ◽  
Cscl Type ◽  
Murnaghan Equation

An investigation of the relative stability of the FeSi structure and of some hypothetical polymorphs of FeSi has been made by first-principles pseudopotential calculations. It has been shown that the observed distortion from ideal sevenfold coordination is essential in stabilizing the FeSi structure relative to one of the CsCl type. Application of high pressure to FeSi is predicted to produce a structure having nearly perfect sevenfold coordination. However, it appears that FeSi having a CsCl-type structure will be the thermodynamically most stable phase for pressures greater than 13 GPa. Fitting of the calculated internal energy vs volume for the FeSi structure to a third-order Birch–Murnaghan equation of state led to values, at T = 0 K, for the bulk modulus, K 0, and for its first derivative with respect to pressure, K 0′, of 227 GPa and 3.9, respectively.

Phase Transitions of Urea Adducts with n-Paraffins under High Pressure

1990 ◽  
Vol 180 (2) ◽  
pp. 405-416 ◽  
Author(s):  
K. Fukao ◽  
T. Horiuchi ◽  
S. Taki ◽  
K. Matsushige
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Urea Adducts
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