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Preparation and Microwave Dielectric Properties of Ultra-low Temperature Sintering Ceramics in K2O-MoO3Binary System

Zhang, Gao-qun and Guo, Jing and He, Li and Zhou, Di and Wang, Hong and Koruza, Jurij and Kosec, Marija and Feteira, A. (2014):
Preparation and Microwave Dielectric Properties of Ultra-low Temperature Sintering Ceramics in K2O-MoO3Binary System.
In: Journal of the American Ceramic Society, pp. 241-245, 97, (1), ISSN 00027820, [Online-Edition: http://dx.doi.org/10.1111/jace.12646],
[Article]

Abstract

A series of microwave dielectric ceramics in the compositions of K2Mo2O7, K2Mo3O10, and K2Mo4O13 in K2O–MoO3 binary system with ultra low sintering temperatures were prepared using the solid-state reaction method. Their synthesis, phase composition, compatibility with metal electrodes, microstructures, and microwave dielectric properties were investigated. The K2Mo2O7 ceramic sintered at 460°C with a triclinic structure has a relative permittivity of 7.5, a Q × f value of 22 000 GHz, and a τf value of −63 ppm/°C. The X-ray diffraction patterns indicate that K2Mo2O7 does not react with Ag and Al electrodes at the co-fired temperatures. The K2Mo3O10 ceramic can be sintered well at 520°C with a relative permittivity of 5.6, a Q × f value of 35 830 GHz, and a τf value of −92 ppm/°C. It has compatibility with Ag electrode. The K2Mo4O13 ceramic sintered at 540°C possesses good microwave dielectric properties with a relative permittivity of 6.8, a Q × f value of 39 290 GHz and a τf value of −67 ppm/°C and it is compatible with Al electrode. For K2Mo2O7 and K2Mo4O13, it is found that the grain sizes and the number of grain boundaries play an important role in the dielectric loss. From this study, it can be seen that the three ceramics in K2O–MoO3 system have good microwave dielectric properties, ultra-low sintering temperatures, non-toxic, and low-cost characteristics. So they can be potentially applied to ultra-LTCC devices.

Item Type: Article
Erschienen: 2014
Creators: Zhang, Gao-qun and Guo, Jing and He, Li and Zhou, Di and Wang, Hong and Koruza, Jurij and Kosec, Marija and Feteira, A.
Title: Preparation and Microwave Dielectric Properties of Ultra-low Temperature Sintering Ceramics in K2O-MoO3Binary System
Language: English
Abstract:

A series of microwave dielectric ceramics in the compositions of K2Mo2O7, K2Mo3O10, and K2Mo4O13 in K2O–MoO3 binary system with ultra low sintering temperatures were prepared using the solid-state reaction method. Their synthesis, phase composition, compatibility with metal electrodes, microstructures, and microwave dielectric properties were investigated. The K2Mo2O7 ceramic sintered at 460°C with a triclinic structure has a relative permittivity of 7.5, a Q × f value of 22 000 GHz, and a τf value of −63 ppm/°C. The X-ray diffraction patterns indicate that K2Mo2O7 does not react with Ag and Al electrodes at the co-fired temperatures. The K2Mo3O10 ceramic can be sintered well at 520°C with a relative permittivity of 5.6, a Q × f value of 35 830 GHz, and a τf value of −92 ppm/°C. It has compatibility with Ag electrode. The K2Mo4O13 ceramic sintered at 540°C possesses good microwave dielectric properties with a relative permittivity of 6.8, a Q × f value of 39 290 GHz and a τf value of −67 ppm/°C and it is compatible with Al electrode. For K2Mo2O7 and K2Mo4O13, it is found that the grain sizes and the number of grain boundaries play an important role in the dielectric loss. From this study, it can be seen that the three ceramics in K2O–MoO3 system have good microwave dielectric properties, ultra-low sintering temperatures, non-toxic, and low-cost characteristics. So they can be potentially applied to ultra-LTCC devices.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 97
Number: 1
Divisions: Study Areas
Date Deposited: 09 Dec 2014 13:41
Official URL: http://dx.doi.org/10.1111/jace.12646
Identification Number: doi:10.1111/jace.12646
Funders: This work was supported by the National 973-project of China (2009CB623302) and NSFC projects of China (61025002).
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