**5. Conclusion**

Several different ferroelectric glass-ceramics systems were discussed in this chapter. All glasses types were mixed with ceramics, resulting in much improved densification behaviour at reduced sintering temperatures. In addition, nanocrystalline glass-ceramics containing perovskite-structured ferroelectric phases have been researched. These studies indicate that the materials exhibit promising dielectric properties and good stability of relative permittivity values at low heat treatment temperatures comparison with conventional preparation methods, although relatively high dielectric losses were evident. This review suggests that ferroelectric glass-ceramics exhibit promising dielectric properties with good potential for use as energy storage dielectrics at high electric field levels as a result of their nanocrystalline microstructures.
