METHOD FOR PRODUCING FERROELECTRIC CERAMIC, AND FERROELECTRIC CERAMIC

摘要

The present invention is to provide a method for producing a dielectric ceramic which can attain firing even at a low temperature lower than 900°C, has a wide range from which the firing temperature is selected, can decrease the porosity of the resultant to densify the microstructure thereof, and can decrease steps for the production to shorten the process period and decrease costs; and the dielectric ceramic. The method of the present invention for producing a dielectric ceramic is a method comprising: shaping mixed powdery particles comprising a cordierite material (2MgO·2Al₂O₃·5SiO₂), and a low-temperature-sintering material comprising Al, Si and Sr, the Si being partially vitrified; and firing the resultant shaped body. The method comprises the step of wet-pulverizing the low-temperature-sintering material together with at least the cordierite material to prepare mixed powder particles having a median diameter D50 less than 1 µm; and, in a process until a time of the preparation of the mixed powder particles, the low-temperature-sintering material undergoes no step of wet-pulverizing only the low-temperature-sintering material, and drying the resultant pulverized material.