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Pb 2 MnO 4 and Sr-doped Pb 2 MnO 4 powders have been synthesized along the Pechini process. Partial substitution of Pb 2+ by Sr 2+ has been effective up to 2 at.%. Beyond this value, secondary phases appeared among others PbO or SrMnO 3 . The effect of high pressures (<6 GPa) and high temperatures (<900 °C) on Pb 2 MnO 4 ...
The high-pressure behaviour of dipotassium sulfide K 2 S with the antifluorite structure (Fm3m, Z=4) has been studied up to 23.0 GPa by in situ synchrotron angle-dispersive X-ray powder diffraction in a diamond anvil cell at room temperature. There occurs a transformation into a distorted Ni 2 In-type structure (Pmma, Z=4) at about 6 GPa upon compression. A mixture of several phases...
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