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Abstract
Microcrystalline glass ceramics are those materials bearing the major characteristics of both glass and ceramic. In the development of high performance ceramic materials, structural, compositional and chemical purifications are the most important weapons of ceramic scientists and engineers. However, in many cases, even the purist single crystalline materials can no longer satisfy the very complicated and comprehensive requirements on the properties and processes of ceramic materials from modern technology. It is the time for us to look for help from novel multiphase ceramic materials. Sol-gel process is introduced to prepare ferroelectric and ferromagnetic microcrystalline glass powders. Various ferroelectric and ferromagnetic crystallites in the size of nanometers and micrometers can be in-situ precipitated from amorphous glass matrices. Then, conventional ceramic processing is used to sinter such microcrystalline glass powders into ceramics. The processing, structure, property and application of PT, BT and KTP based ferroelectric glass ceramics, spinel Mn-Zn ferrite and magnetoplumbite Ba ferrite ferromagnetic glass ceramics will be discussed.