Low-Temperature Sintering and Microwave Dielectric Properties of Li2MgSiO4 Ceramics

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Development of a low-temperature sintered dielectric material derived from Li2MgSiO4 (LMS) for low-temperature cofired ceramic (LTCC) application is discussed in this paper. The LMS ceramics were prepared by the solid-state ceramic route. The calcination and sintering temperatures of LMS were optimized at 850°C/4 h and 1250°C/2 h, respectively, for the best density and dielectric properties. The crystal structure and microstructure of the ceramic were studied by the X-ray diffraction and scanning electron microscopic methods. The microwave dielectric properties of the ceramic were measured by the cavity perturbation method. The LMS sintered at 1250°C/2 h had r=5.1 and tan =5.2 × 10−4 at 8 GHz. The sintering temperature of LMS is lowered from 1250°C/2 h to 850°C/2 h by the addition of both lithium borosilicate (LBS) and lithium magnesium zinc borosilicate (LMZBS) glasses. LMS mixed with 1 wt% LBS sintered at 925°C/2 h had r=5.5 and tan =7 × 10−5 at 8 GHz. Two weight percent LMZBS mixed with LMS sintered at 875°C/2 h had r=5.9 and tan =6.7 × 10−5 at 8 GHz.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2009.02998.x

Affiliations: 1: Materials and Minerals Division, National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, Kerala 695019, India 2: Department of Electronics, CUSAT, Cochin, Kerala 682022, India

Publication date: June 1, 2009



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