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Published in:
01-07-2015
Phase, microstructure and microwave dielectric properties of Ca1−x La x Ti1−x/4O3 (x = 0–1) ceramics
Published in: Journal of Materials Science: Materials in Electronics | Issue 7/2015
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Abstract
La-doped CaTiO3 compounds with general formula Ca1−x
La
x
Ti1−x/4O3 (x = 0–1) were prepared via a mixed oxide solid state sintering route. X-ray diffraction analysis revealed the formation of single phase compounds with orthorhombic (Pbnm) symmetry for x ≤ 0.25. At x ≥ 0.5, A
n
B
n−1O3n
type B-site deficient hexagonal perovskite phases formed along with minor secondary phases. The grain size and morphology and hence, the microwave dielectric properties varied substantially with change in dopant concentration (x). The optimum microwave dielectric properties (εr = 45.3, Q × f
o = 20506 GHz and τf = −14.8 ppm/°C) were achieved at x = 0.75.