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The effect of pressure on both the structure and the electrical conductivity of the superionic Ag7GeSe5I phase has been studied at room temperature (i) by powder X-ray diffraction from 0.1 MPa to 10 GPa, (ii) by single crystal X-ray diffraction from 0.1 MPa to 2 GPa and (iii) by impedance spectroscopy from 0.1 MPa to 1.5 GPa. The decrease in conductivity of about one order of magnitude, when the pressure increases up to 1.5 GPa, can be explained by the compression of the cell.
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