Structure-property relations in xBaTiO(3)-(1-x)La(Mg1/2Ti1/2)O-3 solid solutions
authors Seabra, MP; Avdeev, M; Ferreira, VM; Pullar, RC; Alford, NM; Reaney, IM
nationality International
journal JOURNAL OF THE AMERICAN CERAMIC SOCIETY
keywords TEMPERATURE-COEFFICIENT; MICROWAVE APPLICATIONS; DIELECTRIC-PROPERTIES; COMPLEX PEROVSKITES; TOLERANCE FACTOR; CERAMICS
abstract The microwave dielectric properties and microstructures of compounds in the solid solution series chiBaTiO(3)-(1-chi)La(Mg1/2- Til)03 (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 chi less than or equal to 0.1, X-ray diffraction (XRD) showed evidence of 1:1 ordering between Mg and Ti cations. For x less than or equal to 0.3, XRD and electron diffraction revealed that compounds were tilted in both antiphase and in-phase. However, for 0.3 < χ < 0.7, only antiphase tilting was present. The temperature coefficient of resonant frequency (tau(f)) vs the relative permittivity (epsilon(r) was linear until chi = 0.5 at which point in the solid solution the transition to a nontilted structure resulted in nonlinear behavior. tau(f), values close to zero (-2 ppm/degreesC were achieved at chi = 0.5 (epsilon(r) similar to 60), which had a quality factor (Q:f(o)) of 9600 GHz.
publisher AMER CERAMIC SOC
issn 0002-7820
year published 2004
volume 87
issue 4
beginning page 584
ending page 590
digital object identifier (doi) 10.1111/j.1551-2916.2004.00584.x
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000220981700009
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