Study On Ceramic Material Of Mgtio₃-catio₃ System In High Frequency

In this paper, by choosing MgTiO₃-CaTiO₃(MTZC), we studied the effects of different processes and different contents of CaTiO₃. And discussed the improvements of dielectric properties for adding GD glass to the system.The main crystal phase of MgTiO₃(MTZ) system is MgTiO₃。Its dielectric loss is low, but its dielectric constant is not high enough, temperature coefficient is positive, and sintering temperature is too high. CaTiO₃ can increase the dielectric constant, compensate the temperature coefficient of the MTZ system and lower the sintering temperature, and it can also reduce the loss value. So appropriate to change the CaTiO₃ content can obtain the ceramic materials with zero temperature coefficients.Through extensive experiment and analysis, we found that many processes can affect the dielectric properties of system, such as pebble milling processes, sintering temperature, etc. When 2mm diameter balls were milled for 10 hours, MTZC system which sintered at 1270℃taken on the best dielectric properties. We also added GD glass to the system as the flux, which formed liquid phase in the sintering process, accelerated the sintering of MTZC ceramics. When the mass fraction of GD glass is 12%, MTZC system which sintered at 1100℃exhibited the best dielectric properties.The MTZC system ceramics with superior dielectric properties gained in this study, gives excellent dielectric characteristics (measured at 1MHz) as the follows: tanδ0.5×10^-4 c=0±20ppm/℃ε=21 2...