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Microwave dielectric ceramics of Mg4Nb2O9 with various excess Mg(OH)2 were synthesized by the reaction-sintering process method. The effects of excess Mg(OH)2 on the sintering behavior, phase composition, microstructures and microwave dielectric properties were investigated. XRD patterns show that Mg(OH)2 as raw materials is more beneficial to obtain the pure Mg4Nb2O9 phase than that of MgO. The microwave...
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