Novel series of ultra-low loss microwave dielectric ceramics: Li2Mg3BO6 (B = Ti, Sn, Zr)

Using a conventional solid-state reaction Li2Mg3BO6 (B =Ti, Sn, Zr) ceramics were prepared and their microwave dielectric properties were investigated. The analysis revealed that cubic Li2Mg3BO6 (B=Ti,Sn, Zr) ceramics with a rock salt structure could be obtained in their respective sintering temperature range. Three promising ceramics Li2Mg3TiO6, Li2Mg3SnO6 and Li2Mg3ZrO6 sintered at 1280 degrees C, 1360 degrees C and 1380 degrees C possessed out-bound microwave dielectric properties: epsilon r =15.2, 8.8 and 12.6, Qxf= 152,000 GHz (at 83 GHz), 123,000 GHz (at 10.7 GHz) and 86,000 GHz (at 9.3 GHz), and tau(f) = -39 ppm/degrees C, -32 ppm/ C and -36 ppm/degrees C, respectively. 2015 Elsevier Ltd. All rights reserved.