Pressure-induced valence change and semiconductor-metal transition in PbCrO3

Min Wu; Lirong Zheng; Shengqi Chu; Zhenxing Qin; Xiao Jia Chen; Chuanlong Lin; Zheng Tang; Tiandou Hu

doi:10.1021/jp5072346

Pressure-induced valence change and semiconductor-metal transition in PbCrO₃

Min Wu
, Lirong Zheng
, Shengqi Chu
, Zhenxing Qin
, Xiao Jia Chen
, Chuanlong Lin
, Zheng Tang
, Tiandou Hu^*

^*Corresponding author for this work

CAS - Institute of High Energy Physics
South China University of Technology
Taiyuan University of Science and Technology
Center for High Pressure Science & Technology Advanced Research

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

Abstract

Pressure-induced valence change and semiconductor-metal transition were revealed in perovskite compound PbCrO₃ by X-ray absorption spectroscopy (XAS) and resistance measurements, respectively. The Cr L_2,3 edge XAS spectra indicate a charge disproportionation of Cr (3Cr⁴⁺ → 2Cr³⁺ + Cr⁶⁺) at ambient pressure, suggesting that the ambient-pressure phase of PbCrO₃ has complex local structure and cannot be explained using the simple cubic perovskite structure (Pm-3m). Upon compression up to 4.2 GPa, Cr³⁺ and Cr⁶⁺ ions were converted to Cr⁴⁺ via charge transfer, associated with semiconductor-metal transition. The high-pressure metal phase is determined to be cubic perovskite structure (Pm-3m). Compared with the previous X-ray diffraction experiment, the large volume collapse (∼9.8% at 1.6 GPa) may be related to valence change and semiconductor-metal transition.

Original language	English
Pages (from-to)	23274-23278
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	118
Issue number	40
DOIs	https://doi.org/10.1021/jp5072346
State	Published - 9 Oct 2014
Externally published	Yes

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@article{a9b9057abb664c2abcbb3bf078eff1db,

title = "Pressure-induced valence change and semiconductor-metal transition in PbCrO3",

abstract = "Pressure-induced valence change and semiconductor-metal transition were revealed in perovskite compound PbCrO3 by X-ray absorption spectroscopy (XAS) and resistance measurements, respectively. The Cr L2,3 edge XAS spectra indicate a charge disproportionation of Cr (3Cr4+ → 2Cr3+ + Cr6+) at ambient pressure, suggesting that the ambient-pressure phase of PbCrO3 has complex local structure and cannot be explained using the simple cubic perovskite structure (Pm-3m). Upon compression up to 4.2 GPa, Cr3+ and Cr6+ ions were converted to Cr4+ via charge transfer, associated with semiconductor-metal transition. The high-pressure metal phase is determined to be cubic perovskite structure (Pm-3m). Compared with the previous X-ray diffraction experiment, the large volume collapse (∼9.8\% at 1.6 GPa) may be related to valence change and semiconductor-metal transition.",

author = "Min Wu and Lirong Zheng and Shengqi Chu and Zhenxing Qin and Chen, \{Xiao Jia\} and Chuanlong Lin and Zheng Tang and Tiandou Hu",

note = "Publisher Copyright: {\textcopyright} 2014 American Chemical Society.",

year = "2014",

month = oct,

day = "9",

doi = "10.1021/jp5072346",

language = "英语",

volume = "118",

pages = "23274--23278",

journal = "Journal of Physical Chemistry C",

issn = "1932-7447",

publisher = "American Chemical Society",

number = "40",

}

TY - JOUR

T1 - Pressure-induced valence change and semiconductor-metal transition in PbCrO3

AU - Wu, Min

AU - Zheng, Lirong

AU - Chu, Shengqi

AU - Qin, Zhenxing

AU - Chen, Xiao Jia

AU - Lin, Chuanlong

AU - Tang, Zheng

AU - Hu, Tiandou

PY - 2014/10/9

Y1 - 2014/10/9

N2 - Pressure-induced valence change and semiconductor-metal transition were revealed in perovskite compound PbCrO3 by X-ray absorption spectroscopy (XAS) and resistance measurements, respectively. The Cr L2,3 edge XAS spectra indicate a charge disproportionation of Cr (3Cr4+ → 2Cr3+ + Cr6+) at ambient pressure, suggesting that the ambient-pressure phase of PbCrO3 has complex local structure and cannot be explained using the simple cubic perovskite structure (Pm-3m). Upon compression up to 4.2 GPa, Cr3+ and Cr6+ ions were converted to Cr4+ via charge transfer, associated with semiconductor-metal transition. The high-pressure metal phase is determined to be cubic perovskite structure (Pm-3m). Compared with the previous X-ray diffraction experiment, the large volume collapse (∼9.8% at 1.6 GPa) may be related to valence change and semiconductor-metal transition.

AB - Pressure-induced valence change and semiconductor-metal transition were revealed in perovskite compound PbCrO3 by X-ray absorption spectroscopy (XAS) and resistance measurements, respectively. The Cr L2,3 edge XAS spectra indicate a charge disproportionation of Cr (3Cr4+ → 2Cr3+ + Cr6+) at ambient pressure, suggesting that the ambient-pressure phase of PbCrO3 has complex local structure and cannot be explained using the simple cubic perovskite structure (Pm-3m). Upon compression up to 4.2 GPa, Cr3+ and Cr6+ ions were converted to Cr4+ via charge transfer, associated with semiconductor-metal transition. The high-pressure metal phase is determined to be cubic perovskite structure (Pm-3m). Compared with the previous X-ray diffraction experiment, the large volume collapse (∼9.8% at 1.6 GPa) may be related to valence change and semiconductor-metal transition.

UR - https://www.scopus.com/pages/publications/84908167557

U2 - 10.1021/jp5072346

DO - 10.1021/jp5072346

M3 - 文章

AN - SCOPUS:84908167557

SN - 1932-7447

VL - 118

SP - 23274

EP - 23278

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 40

ER -

Pressure-induced valence change and semiconductor-metal transition in PbCrO₃

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