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Structure–Property Relations in xBaTiO3–(1−x)La(Mg1/2Ti1/2)O3 Solid Solutions

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The microwave dielectric properties and microstructures of compounds in the solid solution series xBaTiO3–(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·fo) of 9600 GHz.
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Keywords: dielectric materials/properties; solid solutions; structure

Document Type: Research Article

Affiliations: 1: Department of Ceramics and Glass Engineering/CICECO, University of Aveiro, 3810-193 Aveiro, Portugal 2: Centre for Physical Electronics and Materials, South Bank University, London SE1 0AA, United Kingdom 3: Department of Engineering Materials, University of Sheffield, Sheffield S1 3JD, United Kingdom

Publication date: April 1, 2004

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