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Pressure-Induced Valence Change and Semiconductor-Metal Transition in PbCrO3
Wu M(吴敏); Zheng LR(郑黎荣); Chu SQ(储盛启); Wu, M; Zheng, LR; Chu, SQ; Qin, ZX; Chen, XJ; Lin, CL; Tang, Z; Hu, TD; Lin CL(林传龙); Hu TD(胡天斗)
AbstractPressure-induced valence change and semiconductormetal transition were revealed in perovskite compound PbCrO3 by X-ray absorption spectroscopy (XAS) and resistance measurements, respectively. The Cr L-2,L-3 edge XAS spectra indicate a charge disproportionation of Cr (3Cr(4+) -> 2Cr(3+) + 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 C-r6+ ions were converted to Cr4+ via charge transfer, associated with semiconductormetal 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 (similar to 9.8% at 1.6 GPa) may be related to valence change and semiconductormetal transition.
Subject AreaChemistry; Science & Technology - Other Topics; Materials Science
Indexed BySCI
WOS IDWOS:000343016800052
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Document Type期刊论文
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GB/T 7714
Wu M,Zheng LR,Chu SQ,et al. Pressure-Induced Valence Change and Semiconductor-Metal Transition in PbCrO3[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2014,118(40):23274-23278.
APA 吴敏.,郑黎荣.,储盛启.,Wu, M.,Zheng, LR.,...&胡天斗.(2014).Pressure-Induced Valence Change and Semiconductor-Metal Transition in PbCrO3.JOURNAL OF PHYSICAL CHEMISTRY C,118(40),23274-23278.
MLA 吴敏,et al."Pressure-Induced Valence Change and Semiconductor-Metal Transition in PbCrO3".JOURNAL OF PHYSICAL CHEMISTRY C 118.40(2014):23274-23278.
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