Preparation Of ZnTiO₃ And MgTiO₃ Materials

ZnTiO3 and MgTiO3 are important microwave dielectric ceramic materials. They have excellent electrical properties, optical properties, chemical properties and play an important role in the field of functional materials. So it is important to explore the effective preparation methods and improve their properties. Various preparation methods were reported, such as solid state method, sol-gel method and hydrothermal method et al. Sintering aids can effectively improve the low-temperature sintering properties of ZnTiO3 and MgTiO3 ceramic materials.Firstly, we explore the effects of different Zn and Ti sources on the formation of ZnTiO3. The results indicate that hexagonal ZnTiO3 is readily formed when the anatase TiO2 is used in the starting mixture, while the crystal phase of powders is effected by zinc sources when rutile TiO2 is used. The particles of as-prepared ZnTiO3 are 200 nm.And then, ZnTiO3 are prepared by improved molten salt method. We discuss the effects of different factors on the preparation of ZnTiO3 and study the low-temperature sintering properties of ZnTiO3. The results indicate that ZnTiO3 is regular in shape with crystal size of about 500 nm in diameter and 70 nm in thickness. And ZnTiO3 are well-dispersed. The optimum sintering temperature of ZnTiO3 is 875? and the optimum sintering time is 3 h. The zinc titanate ceramics with 5 wt% ZnO-B2O3 addition can be well sintered to approach the highest density.Finally, we combine the sol-gel method with the molten salt method to prepare well-dispersed MgTiO3 particles at low temperature and explore the effects of sintering additives on sintering properties of MgTiO3. The results indicate that MgTiO3 can be prepared over the temperature of 450?. V2O5 can cause the abnormal growth grains, while the abnormal growth grain resulted from single V2O5 addition is inhibted because of B2O3 added.