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Inorg Chem. 2016 Jul 5;55(13):6770-5. doi: 10.1021/acs.inorgchem.6b01091. Epub 2016 Jun 16.

Pressure-Induced Structural and Electronic Transition in Sr2ZnWO6 Double Perovskite.

Li N1, Manoun B2, Tang L1,3, Ke F1, Liu F1,4, Dong H1,5, Lazor P6, Yang W1,3.

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Center for High Pressure Science and Technology Advanced Research , Shanghai 201203, China.
Universite Hassan 1er , Laboratoire des Sciences des Matériaux, des Milieux et de la modélisation (LS3M), 25000, Khouribga, Morocco.
High Pressure Synergetic Consortium, Geophysical Laboratory, Carnegie Institution of Washington , Argonne, Illinois 60439, United States.
The state Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University , Shanghai 200433, China.
Key Laboratory of High-temperature and High-pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences , Guizhou 550081, China.
Department of Earth Sciences, Uppsala University , SE-752 36 Uppsala, Sweden.


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 W(6+), thus increasing the covalence, which in turn lowers the charge transfer energy between O(2-) and W(6+) and induces the resistivity increase under high pressure.

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