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Published in:
19-02-2016
Study of the structure–property relationship in Ba substituted CaLa4Ti5O17 ceramics
Published in: Journal of Materials Science: Materials in Electronics | Issue 6/2016
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Abstract
Ca1−xBaxLa4Ti5O17 (0 ≤ x ≤ 0.2) compositions were fabricated via a solid-state mixed oxide route and their phase, microstructure and microwave dielectric properties were investigated. All the compositions formed single phase in the Ca1−xBaxLa4Ti5O17 (0 ≤ x ≤ 0.2) solid solutions within the detection limit of in-house X-ray diffraction. The sintered microstructure of these ceramics comprised densely packed elongated and plate-like grains. The dielectric properties varied linearly with increasing x content. Relative permittivity (ε
r
) increased from 53.2 to 56.6, Q
u
f
o
decreased from 14,600 to 12,630 GHz and τ
f
was tuned through zero and increased from −33.6 to 1.4 ppm/°C with increase in x value from 0 to 0.2. In the present study, εr ≈ 56.6, Q
u
f
o
≈ 12,630 GHz and a near zero τf ≈ 1.4 ppm/°C was achieved for Ba0.2Ca0.80La4Ti5O17 (x = 0.2) ceramics.