scholarly journals Structural Phase Transition to a Lower-Symmetry Phase with Increasing Temperature

1986 ◽  
Vol 76 (4) ◽  
pp. 810-819 ◽  
Author(s):  
K. Yoshimitsu
Keyword(s):  
Phase Transition ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Lower Symmetry ◽  
Symmetry Phase ◽  
Increasing Temperature

The first-order structural phase transition of YSb

2010 ◽  
Vol 88 (8) ◽  
pp. 591-596
Author(s):  
Hongzhi Fu ◽  
WenFang Liu ◽  
Tao Gao
Keyword(s):  
Phase Transition ◽  
Structural Phase Transition ◽  
Density Functional ◽  
Theoretical Calculations ◽  
Structural Phase ◽  
Density Functional Theory Method ◽  
Generalized Gradient ◽  
First Order ◽  
Thermal Expansion Coefficients ◽  
Increasing Temperature

The high-pressure induced phase transition of YSb has been studied using the density functional theory method within the generalized gradient approximation. It was found that the first-order structural phase transition began to occur at 30.8 GPa, agreeing well with available experiments and theoretical calculations. In this phase transition, we do not find changes in the heat capacity and thermal expansion coefficients at lower and higher temperature, but the transition pressures decrease with temperature. The bulk modulus and Debye temperature decrease with increasing temperature, while they increase with increasing pressure. Also, the density of states and band structure of these two compounds with B1 and B2 structures have been presented and analyzed.

scholarly journals PRETRANSITIONAL PHENOMENA IN REGION OF STRUCTURAL PHASE TRANSITION IN SODIUM PERCHLORATE

2019 ◽  
Vol 63 (1) ◽  
pp. 64-70
Author(s):  
Amil R. Aliev ◽  
Isa R. Akhmedov ◽  
Murad G. Kakagasanov ◽  
Zakir A. Aliev ◽  
Sergey P. Kramynin
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Sodium Perchlorate ◽  
First Order ◽  
Temperature Range ◽  
Temperature Dependences ◽  
Increasing Temperature

Structural and dynamic properties and molecular relaxation processes in crystalline sodium NaClO4 perchlorate in the temperature range from 300 K to 650 K were studied by Raman spectroscopy. The temperature dependences of the position of the maximum v (frequency), the width w and the intensity I of the spectral band, corresponding to the fully symmetric vibration v1(A) of the ClO4–1 perchlorate ion, in the spectral range from 933 cm–1 to 944 cm–1 were analyzed. The frequency v and intensity I decrease, and the width w increases with the increasing temperature. It is shown that these temperature dependences have certain features at a temperature of 460 K. With a further increase in temperature, the frequency v decreases more rapidly, the width w increases, and the intensity I decreases more intensively. In the temperature range from 460 K to the temperature Tstr = 581 K of the first order structural phase transition, we observe a deviation of the temperature dependence of the frequency and width from the linear dependences characteristic of lower temperatures. These deviations appear at a temperature of 460 K and increase with the increasing temperature and approaching the phase transition temperature. It has been established that in the crystalline sodium perchlorate NaClO4 a structural first-order phase transition is stretched. At the phase transition temperature (Tstr = 581 K), the width increases sharply, and the frequency decreases sharply, decreasing with a further increase in temperature. The existence of a pretransitional region in the studied crystalline sodium perchlorate NaClO4 was found. This pre-transition region occurs in the temperature range from 460 K to Tstr = 581 K.

Structural Phase Transition of Multilayer VSe2

2020 ◽  
Vol 12 (22) ◽  
pp. 25143-25149 ◽  
Author(s):  
Dian Li ◽  
Xiong Wang ◽  
Chi-ming Kan ◽  
Daliang He ◽  
Zejun Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
Structural Phase Transition ◽  
Structural Phase

scholarly journals Raman spectroscopy study of the behavior of the soft mode in a structural phase transition in the Pr3Sb5O12 crystal

2015 ◽  
Vol 57 (11) ◽  
pp. 2286-2289 ◽  
Author(s):  
A. S. Oreshonkov ◽  
A. K. Khodzhibaev ◽  
A. S. Krylov ◽  
M. F. Umarov ◽  
A. N. Vtyurin
Keyword(s):  
Phase Transition ◽  
Raman Spectroscopy ◽  
Structural Phase Transition ◽  
Soft Mode ◽  
Structural Phase ◽  
Spectroscopy Study

High-pressure structural phase transition and metallization in Ga2S3 under non-hydrostatic and hydrostatic conditions up to 36.4 GPa

2021 ◽  
Author(s):  
Linfei Yang ◽  
Jianjun Jiang ◽  
Lidong Dai ◽  
Haiying Hu ◽  
Meiling Hong ◽  
...  
Keyword(s):  
Phase Transition ◽  
Raman Spectroscopy ◽  
High Pressure ◽  
Structural Properties ◽  
Structural Phase Transition ◽  
First Principles ◽  
Theoretical Calculations ◽  
Structural Phase

The vibrational, electrical and structural properties of Ga2S3 were explored by Raman spectroscopy, EC measurements, HRTEM and First-principles theoretical calculations under different pressure environments up to 36.4 GPa.

scholarly journals Study of the structural phase transition in diamond (100) & (111) surfaces

Carbon Trends ◽  
2021 ◽  
Vol 3 ◽  
pp. 100033
Author(s):  
H. Gomez ◽  
M.N. Groves ◽  
M.R. Neupane
Keyword(s):  
Phase Transition ◽  
Structural Phase Transition ◽  
Structural Phase
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