Abstract
AbstractFrom differential thermal analysis (DTA), thermal etching, perfectly reversable redox treatments and electric conductivity it is concluded that the Pb/Mo ratio of the PbMoO4 crystals is always 1 and that phase transitions do not occur. Pb3+ ions detectable by an absorption band at 435 nm cause a p‐conductivity due to the reaction Pb3+ ⇌ Pb++ + e+. At elevated temperatures the p‐conductivity increases with increasing oxygen partial pressure of the surrounding atmosphere. The influence of foreign ions on the concentration of ionic and electronic defects in PbMoO4, CaMoO4, PbO, and PbTiO3 can be explained by an anti‐Frenkel disorder of the oxygen ion sublattice. For PbMoO4 crystals the mobility O− ion vacancies and the free formation enthalpy of anti‐Frenkel defects are found to be vv = \documentclass{article}\pagestyle{empty}\begin{document}$ \mathop - \limits_T^{9160} $\end{document} exp (−1.15 eV/kT) cm2 K/Vs and gAF = 3.6kT −2.2 eV, respectively.
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