Dense Ba4Ti13O30 ceramic with uniform grains and pure phase is successfully fabricated via a mixed-phase sintering method at 1 200℃and normal pressure,which making use of the additional sintering impetus provided by the solid-phase reaction during the solid-phase sintering process.The phase formation rule,sintering performance and microstructure evolution rule of Ba4 Ti13O30 ceramic are studied,and the dielectric property is characterized.Results show that Ba4 Ti13O30 phase can be synthesized at 1 150℃by using BaTiO3 powder synthesized through the solid-phase reaction method and with TiO2 powder as regent.A single phase has been always formed during the temperature range of 1 150-1 250℃.As the sintering temperature is 1 200℃,the relative density of Ba4 Ti13O30 ceramic obtained reaches a maximum value of 95％,its microwave property is the best,and its dielectric constant and figure of merit Q×f are 40 and 66 273,respectively.Its quality factor is much higher than 13 000,the reported value.However,when the sintering temperature increases slightly to 1 230℃,the relative density of the ceramic sample decreases slightly,the phenomenon of abnormal grain growth occurs,and the microwave property deteriorates sharply,possibly caused by the change of its microstructure.
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