Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 21, Issue 15, Pages 2703-2711Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0955-2219(01)00349-1
Keywords
Ba6-3xR8+2xTi18O54 solid solutions; internal strain; microwave dielectric ceramics; resonator; tungstenbronze-type crystal structure
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The crystallography of tungsten bronze-type like Ba6-3xR8+2xTi18O54 solid solutions for microwave dielectric materials applied for mobile phone and base station were studied. The crystal data and crystal structure of the fundamental lattice and supperlattice, and derivation of chemical formula and structural formula are summarized. Fourier map of the fundamental struct Lire showed that oxygen ion positions of TiO6 octahedra were splitted. This fact proved the tilting of octahedra which is cause of superlattice. The mechanisms of microwave dielectric properties are summarized. Finally, guidelines for the design of the microwave dielectric materials are presented. (C) 2001 Elsevier Science Ltd. All rights reserved.
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