Abstract
Nearly half of the microwave dielectric materials include rare-earth elements based on a database presented by M. T. Sebastian. The presence of rare-earth elements helps to improve the microwave dielectric properties because the crystal structure is adjusted by the ionic radius of the rare-earth element. The microwave dielectrics are grouped by the crystal structure: (1) pseudotungstenbronze Ba6−3x R 8+2x Ti18O54 solid solutions, (2) homologous Ba n La4-Ti3+n O12+3n compounds (3) Y2BaCu2O5 green phases, (4) aeschynite LaYTiO6 and scheelite BaWO4 compounds, (5) perovskite-type ABO3 compounds, (6) garnet A 3 B 2′B 3″O12 compounds. The materials group (3)–(6) are presented. We discuss the groups (1)–(2) in this paper, and presented in “Microwave Dielectric Ceramics with Rare-earth (II)”.
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