Sintering Behavior and Microwave Dielectric Properties of Ba_(1+x)(Mg_(1/3)Nb_(2/3))O_3 CeramicsTIAN Zhong-qing1,ZHAO Wei-lin1,YU Hong-tao2,CHEN Wei-ling1 (1.School of Materials Science and Engineering,Chongqing Institute of Technology,Chongqing 400050,China;2.State Key Lab of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China)Sintering behavior,microstructure and microwave dielectric properties of Ba1+x(Mg1/3Nb2/3)O3(-0.01≤x≤0.01) were investigated.An improvement of the degree of 1∶2 ordering and sinterability was found in Ba-deficient Ba(Mg1/3Nb2/3)O3 because there existed Ba vacancies.Excessive Ba inhibits the sintering and the degree of 1∶2 ordering.It was proposed that excessive Ba exist in grain boundary and inhibit the movement of grain boundary.Therefore,the sintering was restrained.Ba-deficiency had little effect on dielectric constant of Ba(Mg1/3Nb2/3)O3 ceramics.With Ba-deficiency increasing,Qf value decreased drastically.microwave dielectric ceramic;sinterability;ordering;Ba(Mg1/3Nb2/3)O3