Microwave dielectric properties of the 5.7Li2O–Nb2O5–7.3TiO2 ceramics
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Low-firing microwave dielectrics are essential for the miniaturization of microwave devices in mobile communications. Particularly for the fabrication of a multi-chip module (MCM), a simple cofiring process of microwave dielectrics with an internal electrode is highly desirable. For this purpose, low-temperature cofired ceramics (LTCC) have been widely investigated [1, 2, 3, 4, 5]. In LTCC, firing temperature lower than 950 °C is favorable since Ag with the melting point of 960 °C can be used instead of more expensive electrodes such as Ag–Pd binary or Pt–Pd–Au ternary alloys.
Unfortunately, although most of the well-known commercial microwave dielectric ceramics could have good microwave dielectric properties, they could not be used as LTCC materials for high sintering temperatures. So, how to reduce their sintering temperatures to lower than the melting point of the electrode conductors has aroused worldwide interest. Up to now, three kinds of methods have been commonly used for...
KeywordsResonant Frequency Sinter Temperature B2O3 Nb2O5 Li2O
This work was supported by National 863-project of China under grant 2006AA03Z0429, NCET-05-0840 and National 973-project of China under grant 2002CB613302.