CONFIGURATION AND COORDINATION NUMBER OF CATION POLYHEDRA OF TUNSTENBRONZE-TYPE-LIKE Ba6-3xSm8+2xTi18O54 SOLID SOLUTIONS

The crystal structures and microwave dielectric properties of Ba6-3xR8+2xTi18O54 solid solutions (R = Sm, Nd, Pr, and La) were studied. The dielectric constant is affected by the volumes of cation polyhedra in which ions are located: octahedral B-site for Ti ion; rhombic A1-site mainly for R ions, d...

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Published inJournal of the European Ceramic Society Vol. 23; no. 14; pp. 2529 - 2533
Main Authors Ohsato, H, Futamata, Y, Sakashita, H, Araki, N, Kakimoto, K, Nishigaki, S
Format Journal Article
LanguageEnglish
Published 01.01.2003
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Summary:The crystal structures and microwave dielectric properties of Ba6-3xR8+2xTi18O54 solid solutions (R = Sm, Nd, Pr, and La) were studied. The dielectric constant is affected by the volumes of cation polyhedra in which ions are located: octahedral B-site for Ti ion; rhombic A1-site mainly for R ions, deformed from cuboctahedron in perovskite structure; pentagonal A2-site for Ba ions and trigonal C-site for small ions. In the more precise crystal structure, the A1- and A2-sites separate into five and two independent positions, respectively. The configurations and coordination numbers of the cation polyhedra are presented. The dielectric constant is also discussed based on the volume of these polyhedra. 7 refs.
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ISSN:0955-2219