During past over 30 years, low temperature cofired ceramic (LTCC) technology has been developed to meet with the requirements of small, light weight and multifunctional electronic components through enabling fabrication of three-dimensional ceramic modules with low dielectric loss and embedded silver electrode. A recent technology is to develop new dielectrics with ultra-low sintering temperature (usually \650°C) to save energy, reduce processing time, and to enable further integrations with semiconductors, metals or even plastics. In this review, we summarized the materials with ultra-low sintering temperature developed in past over 10 years, which will be helpful for those researchers to not only develop new materials but also improve all technologies in ultra-LTCC fields.
The microwave dielectric properties of the (1−x)CaTiO3–xCa(Zn1/3Nb2/3)O3 ceramic system have been investigated. The ceramic samples sintered at 1300°–1450°C for 4 h in air exhibit orthorhombic pervoskite and form a complete solid solution for different x value. When the x value increased from 0.2 to 0.8, the permittivity ɛr decreased from 115 to 42, the unloaded quality factor Q×f increased from 5030 to 13 030 GHz, and the temperature coefficient τf decreased from 336 to −28 ppm/°C. When x=0.7, the best combination of dielectric properties, a near zero temperature coefficient of resonant frequency of τf∼−6 ppm/°C, Q×f∼10 860 GHz and ɛr∼51 is obtained.
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