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Crystalline Structure and Dielectric Properties of Li 1+ x−y Nb 1− x −3 y Ti x +4 y O 3 M ‐Phase Solid Solutions
Author(s) -
Borisevich Albina Y.,
Davies Peter K.
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00134.x
Subject(s) - solid solution , corundum , materials science , permittivity , titanium , dielectric , temperature coefficient , relative permittivity , microwave , phase (matter) , lattice constant , crystal structure , mineralogy , dielectric permittivity , analytical chemistry (journal) , crystallography , composite material , chemistry , optics , optoelectronics , metallurgy , diffraction , physics , organic chemistry , chromatography , quantum mechanics
The structure and dielectric properties of the so‐called M ‐phase solid solutions in the Li 2 O–Nb 2 O 5 –TiO 2 system have been investigated. Detailed studies of the lattice parameters of these phases agree well with structure models based on intergrowths of LiNbO 3 slabs with a titanium‐rich corundum‐type layer. The relative permittivity ranges from ∼80 to ∼55; microwave quality factors increase with the titanium content, reaching values of Q × f = 9000 at 6 GHz. The temperature coefficient of the resonant frequency changes sign within the solid solution region, thus permitting tunability to a zero value. All the compositions can be sintered to high density at temperatures ≤1100°C.