Pressure-Induced Structural and Electronic Transition in Sr2ZnWO6 Double Perovskite

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• 作者：Nana Li ; Bouchaib Manoun ; Lingyun Tang ; Feng Ke ; Fengliang Liu ; Haini Dong ; Peter Lazor ; Wenge Yang
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：July 5, 2016
• 年：2016
• 卷：55
• 期：13
• 页码：6770-6775
• 全文大小：550K
• 年卷期：0
• ISSN：1520-510X

文摘

High-pressure structural and electrical properties of Sr₂ZnWO₆ double perovskite were investigated using in situ angle-dispersive synchrotron X-ray diffraction (XRD), Raman, and alternating current (AC) impedance spectroscopy. A structural transition from monoclinic (P2₁/n) to triclinic (P1̅) phase around 9 GPa was observed due to the pressure-induced distortion of (W, Zn)O₆ octahedron. In situ high-pressure Raman spectroscopy showed the increasing interaction among O–W–O in WO₆ octahedron with pressure and a transition pressure consistent with the XRD results. From the AC impedance spectroscopy measurements, the resistivity increased steeply by ∼1 order of magnitude around 11 GPa, indicating an electronic transition accompanying the symmetry change. The increase in the interaction among O–W–O enhances the attraction of O^2– electrons toward W⁶⁺, thus increasing the covalence, which in turn lowers the charge transfer energy between O^2– and W⁶⁺ and induces the resistivity increase under high pressure.