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Structure–Property Relations in x BaTiO 3 –(1− x )La(Mg 1/2 Ti 1/2 )O 3 Solid Solutions
Author(s) -
Seabra Maria P.,
Avdeev Maxim,
Ferreira Victor M.,
Pullar Rob C.,
Alford* Neil McN.,
Reaney* Ian M.
Publication year - 2004
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.1551-2916.2004.00584.x
Subject(s) - solid solution , x ray crystallography , dielectric , diffraction , analytical chemistry (journal) , crystallography , materials science , phase (matter) , crystal structure , temperature coefficient , microstructure , mineralogy , chemistry , physics , optics , metallurgy , optoelectronics , organic chemistry , chromatography , composite material
The microwave dielectric properties and microstructures of compounds in the solid solution series x BaTiO 3 –(1− x )La(Mg 1/2 Ti 1/2 )O 3 (BTLMT) have been investigated. The structural phase transitions that occur as a function of x have been studied and are related to changes in the dielectric properties. For compounds where x ≤ 0.1, X‐ray diffraction (XRD) showed evidence of 1:1 ordering between Mg and Ti cations. For x ≤ 0.3, XRD and electron diffraction revealed that compounds were tilted in both antiphase and in‐phase. However, for 0.3 < x < 0.7, only antiphase tilting was present. The temperature coefficient of resonant frequency (τ f ) vs the relative permittivity (ɛ r ) was linear until x = 0.5 at which point in the solid solution the transition to a nontilted structure resulted in nonlinear behavior. τ f values close to zero (−2 ppm/°C) were achieved at x = 0.5 (ɛ r ∼ 60), which had a quality factor ( Q · f o ) of 9600 GHz.