Study of high-pressure-induced phase transition in nanocrystalline perovskite (LaSr)(MnFe)O3by Raman spectroscopy

2008 ◽  
Vol 39 (12) ◽  
pp. 1765-1771 ◽  
Author(s):  
Nita Dilawar ◽  
Usha Chandra ◽  
G. Parthasarathy ◽  
A. K. Bandyopadhyay
Keyword(s):  
Phase Transition ◽  
Raman Spectroscopy ◽  
High Pressure

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.

Phase Transition and vibration properties of MnCO3 at high pressure and high-temperature by Raman spectroscopy

2018 ◽  
Vol 38 (3) ◽  
pp. 212-223 ◽  
Author(s):  
Chaoshuai Zhao ◽  
Heping Li ◽  
Jianjun Jiang ◽  
Yu He ◽  
Wen Liang
Keyword(s):  
Phase Transition ◽  
Raman Spectroscopy ◽  
High Pressure ◽  
High Temperature ◽  
Vibration Properties

Raman Scattering Spectroscopic Study of n-Pentane under High Pressure

2005 ◽  
Vol 59 (5) ◽  
pp. 650-653 ◽  
Author(s):  
Erwei Qiao ◽  
Haifei Zheng
Keyword(s):  
Phase Transition ◽  
Raman Spectroscopy ◽  
High Pressure ◽  
Ambient Temperature ◽  
Pressure Range ◽  
High Pressure Phase Transition ◽  
Stretching Vibration ◽  
Twist Mode ◽  
Solid Liquid ◽  
Pressure Phase

The Raman spectroscopy of n-pentane was investigated in a Moissanite anvil cell from 0.07 GPa to 4.77 GPa at ambient temperature. The result shows that the CH3 symmetric stretching vibration (2877 cm−1) and asymmetric stretching vibration (2964 cm−1), the CH2 symmetric stretching vibration (2856 cm−1) and asymmetric stretching vibration (2935 cm−1), and –(CH2)n– in-phase twist mode (1303 cm−1) shifted to higher wavenumbers almost linearly with increasing pressure. Around 2.4 GPa an abrupt visible change took place, indicating a sort of phenomenon of freezing due to over-pressurization. In the pressure range of 2.84 to 4.77 GPa a high-pressure phase transition may occur in the crystallized n-pentane. By determining pressure with the method of solid–liquid coexistence, we concluded that the equilibrium freezing pressure of n-pentane is 1.90 ± 0.05 GPa at 27 °C.

scholarly journals Phase Transition and Metallization of Orpiment by Raman Spectroscopy, Electrical Conductivity and Theoretical Calculation under High Pressure

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 784 ◽  
Author(s):  
Kaixiang Liu ◽  
Lidong Dai ◽  
Heping Li ◽  
Haiying Hu ◽  
Linfei Yang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Electrical Conductivity ◽  
Raman Spectroscopy ◽  
High Pressure ◽  
First Principles ◽  
Theoretical Calculations ◽  
Structural Phase ◽  
Theoretical Research ◽  
Continuous Change ◽  
Transmission Electron

The structural, vibrational, and electronic characteristics in orpiment were performed in the diamond anvil cell (DAC), combined with a series of experimental and theoretical research, including Raman spectroscopy, impedance spectroscopy, atomic force microscopy (AFM), high-resolution transmission electron microscopy (HRTEM), and first-principles theoretical calculations. The isostructural phase transition at ~25.0 GPa was manifested as noticeable changes in the compressibility, bond lengths, and slope of the conductivity, as well as in a continuous change in the pressure dependence of the unit cell volume. Furthermore, a pressure-induced metallization occurred at ~42.0 GPa, accompanied by reversible electrical conductivity. We also determined the metallicity of orpiment at 45.0 GPa by first-principles theoretical calculations, and the results were in good agreement with the results of the temperature-dependent conductivity measurements. The HRTEM and AFM images of the recovered sample confirmed that orpiment remains in the crystalline phase with an intact layered structure and available crystal-shaped clusters. These high-pressure behaviors of orpiment present some crucial information on the structural phase transition, metallization, amorphization and superconductivity for the A2B3-type of engineering materials at high pressure.

High-pressure fcc-to-hcp phase transition in solid krypton studied by Raman spectroscopy

2009 ◽  
Vol 79 (13) ◽  
Author(s):  
Hiroyasu Shimizu ◽  
Masashi Kawajiri ◽  
Tetsuji Kume ◽  
Shigeo Sasaki ◽  
Yuri A. Freiman ◽  
...  
Keyword(s):  
Phase Transition ◽  
Raman Spectroscopy ◽  
High Pressure ◽  
Solid Krypton

High‐pressure Raman spectroscopy of CeOCl: Observation of the isostructural phase transition

2019 ◽  
Vol 50 (12) ◽  
pp. 1962-1968 ◽  
Author(s):  
Leilei Zhang ◽  
Ya Cheng ◽  
Xianlong Wang ◽  
Qiwei Hu ◽  
Zhi Zeng ◽  
...  
Keyword(s):  
Phase Transition ◽  
Raman Spectroscopy ◽  
High Pressure ◽  
Isostructural Phase Transition

scholarly journals Structural Phase Transition and Metallization of Nanocrystalline Rutile Investigated by High-Pressure Raman Spectroscopy and Electrical Conductivity

Minerals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 441 ◽  
Author(s):  
Meiling Hong ◽  
Lidong Dai ◽  
Heping Li ◽  
Haiying Hu ◽  
Kaixiang Liu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Electrical Conductivity ◽  
Raman Spectroscopy ◽  
High Pressure ◽  
Structural Phase Transition ◽  
Electrical Transport ◽  
Structural Phase ◽  
Pressure Coefficient ◽  
Complex Impedance ◽  
Atmospheric Condition

We investigate the structural, vibrational, and electrical transport properties of nanocrystalline rutile and its high-pressure polymorphs by Raman spectroscopy, and AC complex impedance spectroscopy in conjunction with the high-resolution transmission electron microscopy (HRTEM) up to ~25.0 GPa using the diamond anvil cell (DAC). Experimental results indicate that the structural phase transition and metallization for nanocrystalline rutile occurred with increasing pressure up to ~12.3 and ~14.5 GPa, respectively. The structural phase transition of sample at ~12.3 GPa is confirmed as a baddeleyite phase, which is verified by six new Raman characteristic peaks. The metallization of the baddeleyite phase is manifested by the temperature-dependent electrical conductivity measurements at ~14.5 GPa. However, upon decompression, the structural phase transition from the metallic baddeleyite to columbite phases at ~7.2 GPa is characterized by the inflexion point of the pressure coefficient and the pressure-dependent electrical conductivity. The recovered columbite phase is always retained to the atmospheric condition, which belongs to an irreversible phase transformation.

Raman spectroscopy and phase transition of anatase TiO2 under high pressure

2001 ◽  
Vol 62 (4) ◽  
pp. 717-721 ◽  
Author(s):  
T. Sekiya ◽  
S. Ohta ◽  
S. Kamei ◽  
M. Hanakawa ◽  
S. Kurita
Keyword(s):  
Phase Transition ◽  
Raman Spectroscopy ◽  
High Pressure ◽  
Anatase Tio2
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