In this work, the sintering temperatures of Mg2Al4Si5O18 ceramics was reduced to ∼ 900°C by adding BaCu(B2O5) (BCB). Mg2Al4Si5O18 reacts with BCB to form the second phase BaAl2Si2O8. As the sintering temperature was 950°C, the second phase transformed from hexagonal BaAl2Si2O8 to monoclinic BaAl2Si2O8 with increasing BCB content. When the BCB content was 15 wt.%, the second phase formed from hexagonal BaAl2Si2O8 to monoclinic BaAl2Si2O8 with increasing sintering temperature. Especially, the sintering temperature of Mg2Al4Si5O18 + 30 wt.%BCB ceramic was reduced to 900°C and the ceramics exhibited good microwave dielectric properties with Q × f = 21,300 GHz, εr= 3.4 and τf = − 30 ppm/°C. The results showed that Mg2Al4Si5O18-BCB ceramics are candidates for LTCC devices.
Microwave dielectric ceramic Mg2Al4Si5O18Low relative permittivity Sintering temperature
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1.Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, School of Materials Science and EngineeringGuilin University of TechnologyGuilinChina