Structure–Property Relations in xBaTiO3–(1−x)La(Mg1/2Ti1/2)O3 Solid Solutions |
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Authors: | Maria P Seabra Maxim Avdeev Victor M Ferreira Rob C Pullar Neil McN Alford Ian M Reaney |
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Affiliation: | Department of Ceramics and Glass Engineering/CICECO, University of Aveiro, 3810-193 Aveiro, Portugal;Centre for Physical Electronics and Materials, South Bank University, London SE1 0AA, United Kingdom;Department of Engineering Materials, University of Sheffield, Sheffield S1 3JD, United Kingdom |
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Abstract: | The microwave dielectric properties and microstructures of compounds in the solid solution series x BaTiO3–(1? x )La(Mg1/2Ti1/2)O3 (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 (τf) vs the relative permittivity (?r) was linear until x = 0.5 at which point in the solid solution the transition to a nontilted structure resulted in nonlinear behavior. τf values close to zero (?2 ppm/°C) were achieved at x = 0.5 (?r~ 60), which had a quality factor ( Q · f o) of 9600 GHz. |
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Keywords: | structure dielectric materials/properties solid solutions |
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