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 Orpiment under compression: metavalent bonding at high pressure

2020 ◽  
Vol 22 (6) ◽  
pp. 3352-3369 ◽  
Author(s):  
Vanesa Paula Cuenca-Gotor ◽  
Juan Ángel Sans ◽  
Oscar Gomis ◽  
Andres Mujica ◽  
Silvana Radescu ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Strong Change ◽  
Isostructural Phase Transition

Orpiment (α-As2S3) under compression reports a strong change in the coordination of As atoms at 25 GPa, which can be ascribed to an isostructural phase transition. These changes are consistent with the formation of metavalent bonds in orpiment.

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

Isostructural Phase Transition in Bismuth Oxide Chloride Induced by Redistribution of Charge under High Pressure

2015 ◽  
Vol 119 (49) ◽  
pp. 27657-27665 ◽  
Author(s):  
Jinggeng Zhao ◽  
Lingling Xu ◽  
Yang Liu ◽  
Zhenhai Yu ◽  
Chunyu Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Bismuth Oxide ◽  
Isostructural Phase Transition

Publisher's Note: Experimental Evidence for a High-Pressure Isostructural Phase Transition in Osmium [Phys. Rev. Lett.93, 095502 (2004)]

2004 ◽  
Vol 93 (10) ◽  
Author(s):  
Florent Occelli ◽  
Daniel L. Farber ◽  
James Badro ◽  
Chantel M. Aracne ◽  
David M. Teter ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Experimental Evidence ◽  
Isostructural Phase Transition

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.

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

scholarly journals Evidence for a high-pressure isostructural transition in nitrogen

2021 ◽  
Author(s):  
Chunmei Fan ◽  
Shan Liu ◽  
Jingyi Liu ◽  
Qiqi Tang ◽  
Binbin Wu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
High Pressure ◽  
Lattice Parameter ◽  
Molecular Symmetry ◽  
Solid Nitrogen ◽  
Slight Rotation ◽  
Pressure Phase ◽  
Important Objective ◽  
Isostructural Phase Transition

Abstract Understanding the high-pressure behaviors of diatomic molecules (H2, O2, N2, etc) is one of the most basic as well as important objective in high-pressure physics. Under high pressure diatomic molecule solids often exhibit rich crystal polymorphs. High-pressure isostructural transitions (HPIT) in solid hydrogen and oxygen, involving considerable technical challenges, have been experimentally documented, suggesting a possible prevailing pressure-driven molecular-symmetry breaking pathway. In spite of extensive efforts, however, HPIT in nitrogen has not been observed so far. Here we present a monoclinic-to-monoclinic isostructural phase transition (λ→λ’) in solid nitrogen at approximately 50 GPa accompanied with anomalies in lattice parameter, atomic volume and Raman vibron modes. Further ab initio calculations strongly confirmed the HPIT in nitrogen, showing the weak distortion of orientation and slight rotation in nitrogen molecules possibly drive the low-pressure phase, λ-N2, to an isostructural high-pressure phase, λ’-N2 without changing crystal symmetry. In addition, we probed in detail the phase stability and revisited the pressure-temperature (P-T) phase diagram of nitrogen, discovering a new high-pressure amorphous phase, η’-N2.

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