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Low‐Temperature Sintering and Microwave Dielectric Properties of Li 2 MgSiO 4 Ceramics
Author(s) -
George Sumesh,
Anjana Prabhakaran Sreekumari,
Deepu Vasudevan Nair,
Mohanan Pezholil,
Sebastian Mailadil Thomas
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.02998.x
Subject(s) - sintering , materials science , ceramic , borosilicate glass , microstructure , dielectric , calcination , mineralogy , scanning electron microscope , composite material , analytical chemistry (journal) , optoelectronics , chemistry , biochemistry , chromatography , catalysis
Development of a low‐temperature sintered dielectric material derived from Li 2 MgSiO 4 (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 ɛ r =5.1 and tan δ=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 ɛ r =5.5 and tan δ=7 × 10 −5 at 8 GHz. Two weight percent LMZBS mixed with LMS sintered at 875°C/2 h had ɛ r =5.9 and tan δ=6.7 × 10 −5 at 8 GHz.