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Erschienen in:
28.04.2017
Microwave dielectric ceramic of LiZnPO4 for LTCC applications
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 16/2017
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Abstract
The feasibility of LiZnPO4 (LZP) ceramic prepared by a solid-state reaction method for low-temperature co-fired ceramic application was investigated. Dense ceramic with 94.37% relative density was obtained when the ceramic was sintered at 850 °C for 4 h. The LZP ceramic sintered at 850 °C for 4 h possessed a relative permittivity (εr) of 5.3 and high quality factor (Q × f) of 28,496 GHz (at 12.9 GHz) with a temperature coefficient of resonant frequency (τ
f
) of −80.4 ppm/°C. The relatively large negative τ
f
value was reduced by adding TiO2 into LZP ceramics. The microstructure, microwave dielectric properties and cofiring compatibility with silver of LZP–TiO2 composites were discussed. The composite with 0.17 volume fraction of TiO2 sintered at 950 °C for 4 h shows εr = 10.0, Q × f = 10,025 GHz, τ
f
= +1.6 ppm/°C. The LZP-TiO2 composite was chemically compatible with the commonly used electrode material silver.