Divalent ion exchange of alkaline-earth cations into the triple-layered perovskite RbCa2Nb3O10
1998; Elsevier BV; Volume: 33; Issue: 11 Linguagem: Inglês
10.1016/s0025-5408(98)00166-4
ISSN1873-4227
AutoresCharles H. Mahler, Brian L. Cushing, John N. Lalena, John Wiley,
Tópico(s)Microwave Dielectric Ceramics Synthesis
ResumoAbstract Ion exchange reactions between the Dion-Jacobson-type, triple-layered perovskite RbCa 2 Nb 3 O 10 and calcium, strontium, and barium cations were investigated. Exchange occurs in all systems, but only the strontium and barium systems form stable compounds. The final products, Rb 1−x Sr x/2 Ca 2 Nb 3 O 10 (x = 0.45) and Rb 1−x Ba x/2 Ca 2 Nb 3 O 10 (x = 0.55), are isostructural with the parent. Unit cells contract upon replacement of rubidium with the smaller, more highly charged cation. The effect of layer contraction in directing the extent of exchange is discussed.
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