Abstract
Pb 2MnO 4 and Sr-doped Pb 2MnO 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 2MnO 4, containing Pb 2+ cations with electron lone pairs, has been studied. In spite of the lone pairs present, this semiconductor (Eg = 1.5 eV) did not exhibit any phase transition under pressure. Instead, decomposition into three phases (Pb 3Mn 7O 15, PbO and Pb 3O 4) has been observed with reduction of Mn 4+ to Mn 3+ and concomitant to oxidation of Pb 2+ to Pb 4+. Strontium doping, bearing no electron lone pair, turned out, however, to lead to the same decomposition, the one difference being a higher decomposition temperature. Electronic and thermal properties of pure and doped Pb 2MnO 4 were also investigated.
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