Structural and microwave dielectric properties of Ba5-xLaxTixNb4-xO15 ceramics
Tóm tắt
The structural and microwave dielectric properties of Ba5−x
La
x
Ti
x
Nb4−x
O15 (1 ≤ x ≤ 3) was investigated. The single phase with A5B4O15-type cation-deficient hexagonal perovskite structure was obtained over the whole composition range. These ceramics have high dielectric constant up to 56, high quality factors (Q × f ) up to 35,000, and low temperature coefficient of resonant frequencies (τ
f
) in the range +69 to −3 ppm °C−1. The dielectric constants and τ
f
of these ceramics gradually decrease parallel to an increase in B-site bond valence with increasing La and Ti content.
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