Synthesis and phase transitions of K2MoO4
Synthesis and phase transitions of K2MoO4
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K2MoO4 的合成和相变
DOI：
10.1039/jm9920200323
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发表时间：
1992
影响因子：
--
通讯作者：
Mio Sakai
中科院分区：
文献类型：
--
作者：
M. Inagaki;Y. Nishikawa;Mio Sakai
以KOH和（NH4）6Mo7O24为原料，在室温下用乙醇沉淀法制备了结晶良好的K2MoO4粉体。高温六方相冷却后得到亚稳的斜方相（β′相）K2MoO4，并保留了六方相的调制结构。当K_2MoO_4熔体冷却时，观察到一组尖锐的放热峰，对应于从具有调制结构的六方相（α相）向室温单斜相（γ相）的转变和样品的碎裂。
A well crystallized K2MoO4 powder has been synthesized from an aqueous solution of KOH and (NH4)6Mo7O24 by precipitation in ethanol at room temperature and removal of ammonia. A metastable orthorhombic Phase(β′-phase) of K2MoO4 was obtained when the high-temperature hexagonal phase was cooled, and the modulated structure of the hexagonal phase was retained. When the melt of K2MoO4 was cooled a group of sharp exothermic peaks were observed, corresponding to the transition from the hexagonal phase with modulated structure (α-phase) to the room-temperature monoclinic phase (γ-phase) and to fragmentation of the sample The results are discussed on the basis of stress accumulation due to the hindrance to the α′–β′ phase t which involves a large volume shrinkage.