Microwave dielectric ceramic of LiZnPO4 for LTCC applications

• Published in: Journal of materials science. Materials in electronics Vol. 28; no. 16; pp. 12026 - 12031
• Main Authors: Xia, C. C., Jiang, D. H., Chen, G. H., Luo, Y., Li, B., Yuan, C. L., Zhou, C. R.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-08-2017; Springer Nature B.V
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Concentration (composition); Dielectric properties; Electrode materials; Materials Science; Optical and Electronic Materials; Permittivity; Q factors; Sintering; Titanium oxides; LiMnPO4; Microwave Dielectric Property; Sinter Temperature; Silver Powder; TiO2
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-017-7013-4

The feasibility of LiZnPO
4
(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 (ε
r
) 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 TiO
2
into LZP ceramics. The microstructure, microwave dielectric properties and cofiring compatibility with silver of LZP–TiO
2
composites were discussed. The composite with 0.17 volume fraction of TiO
2
sintered at 950 °C for 4 h shows ε
r
 = 10.0, Q × 
f
 = 10,025 GHz, τ
f
 = +1.6 ppm/°C. The LZP-TiO
2
composite was chemically compatible with the commonly used electrode material silver.