Abstract

Oxymolybdates La₂MoO₆, both pure and doped with magnesium, have been obtained by the flux crystallization method and solid-phase synthesis as single crystals and polycrystals, respectively. The compounds are described by X-ray diffraction analysis, thermogravimetry, and differential scanning calorimetry; their conducting properties have been investigated. A model of the structure of magnesium-doped La₂MoO₆ single crystals is proposed. Incorporation of divalent magnesium atoms into the sites of hexavalent molybdenum atoms in the La₂MoO₆ structure leads to the formation of oxygen vacancies and a slight increase in the conductivity of doped samples in comparison with pure crystals. The compounds under study have hygroscopic properties.

中文翻译：

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含镁氧钼酸盐La 2 MoO 6的结构和物理性质

摘要

通过助熔剂结晶法和固相合成分别获得了纯净的和掺杂有镁的氧钼酸盐La ₂ MoO ₆，分别为单晶和多晶。化合物通过X射线衍射分析，热重分析和差示扫描量热法进行描述。已经研究了它们的导电性能。提出了镁掺杂La ₂ MoO ₆单晶的结构模型。在La ₂ MoO ₆中将二价镁原子掺入六价钼原子的位点与纯晶体相比，这种结构导致氧空位的形成和掺杂样品电导率的轻微增加。所研究的化合物具有吸湿性。