Pressure-induced structural instability and amorphization in compressed alpha-V2O5

Zou, Yongtao1,2,3,4; Zhang, Hua3,4

2019-06-25

10.1016/j.jallcom.2019.03.176

JOURNAL OF ALLOYS AND COMPOUNDS   影响因子和分区

0925-8388

1873-4669

We report pressure-induced structural instability and amorphization in compressed orthorhombic alpha-V2O5 by in situ synchrotron x-ray diffraction observations and Raman spectroscopy measurements in diamond-anvil cells up to 20.2 GPa and 21.9 GPa, respectively. In situ x-ray lattice parameters (a, b, c) and d-spacings at high pressure show that the orthorhombic alpha-V2O5 exhibits an apparent discontinuity at -4.3 GPa, indicating the occurrence of structural distortion upon compression. Upon further pressurization, the distorted alpha-V2O5 starts to be amorphizing at -12.6 GPa and becomes fully amorphous at -20.2 GPa, which is again confirmed by our high-pressure Raman spectroscopy measurements. This obtained amorphous V 2 0 5 polymorph can be recovered at ambient conditions, showing that the pressure-driven distorted orthorhombic-to-amorphous phase transformation is irreversible. Moreover, Gruneisen parameters of various Raman modes for alpha-V2O5 are derived, which are in agreement with the previously experiential study by Arora et al. Our results might be important to understand the highpressure behaviors in M2O5 polymorphs for their uses at extreme conditions. (C) 2019 Elsevier B.V. All rights reserved.

Vanadium oxide High pressure Phase transition Amorphization Synchrotron x-ray diffraction Raman spectroscopy measurements

SCI ; EI

英语

第一 ; 通讯

Guangdong Innovative & Entrepreneurial Research Team Program[2016ZT06C279]

Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering

Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000464663600020

ELSEVIER SCIENCE SA

20191206663345

Amorphization ; Phase transitions ; Raman spectroscopy ; Synchrotron radiation ; X ray diffraction

Physical Chemistry:801.4 ; Chemical Operations:802.3 ; Particle Accelerators:932.1.1

MATERIALS SCIENCE

Web of Science

1.Southern Univ Sci & Technol SUSTech, Acad Adv Interdisciplinary Studies, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol SUSTech, Dept Phys, Shenzhen 518055, Peoples R China
3.Jilin Univ, State Key Lab Superhard Mat, Changchun 130012, Jilin, Peoples R China
4.Jilin Univ, Sch Phys, Changchun 130012, Jilin, Peoples R China

Zou, Yongtao,Zhang, Hua. Pressure-induced structural instability and amorphization in compressed alpha-V2O5[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2019,790:164-169.

Zou, Yongtao,&Zhang, Hua.(2019).Pressure-induced structural instability and amorphization in compressed alpha-V2O5.JOURNAL OF ALLOYS AND COMPOUNDS,790,164-169.

Zou, Yongtao,et al."Pressure-induced structural instability and amorphization in compressed alpha-V2O5".JOURNAL OF ALLOYS AND COMPOUNDS 790(2019):164-169.