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Erschienen in:
01.03.2012
Low loss and middle permittivity of (1 − x) Ca4La2Ti5O17–xNdAlO3 dielectric resonators with near-zero temperature coefficient of the resonant frequency
Erschienen in: Journal of Materials Science | Ausgabe 5/2012
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Abstract
The crystal structures, microstructure and microwave dielectric properties of (1 − x) Ca4La2Ti5O17–xNdAlO3 (0 ≤ x ≤ 0.7) ceramic system have been investigated. The results show that all the compositions form single-phase ceramics. The microwave dielectric properties are strongly correlated with composition, sintering temperature, grain sizes and lattice defects. The cell volume decreases because of the substitution of Al3+ for Ti4+ and Nd3+ for La3+ which is associated with a decrease in the permittivity. With increase in x value, the permittivity (ε
r
), temperature coefficient of resonant frequency (τ
f
) and Q × f value decrease. A near-zero τ
f
is achieved at x = 0.6 with permittivity of 41.8 and Q × f value of 13,783 GHz.