Abstract
Lead zinc niobate (Pb(Zn1/3Nb2/3)O3 : PZN) is a ferroelectric relaxor with perovskite-related stmcture exhibiting a diffuse phase transition at ˜140°C. Single crystals of PZN have shown excellent dielectric, electro-optic and electrostrictive properties. However, attempts to achieve these properties in polycrystalline ceramic PZN samples have failed. Using conventional powder processing it has not been possible to synthesize a monophase perovskite stmcture, due to the pervasion of lead niobate pyrochlore phases. It is thought that the pyrochlore phases are the detrimental factor of most importance. However, lack of information on pyrochlore structures and on the PZN perovskite phase prevents full characterization of the microstructures of ceramic samples. To understand more completely the composition and stmcture of the various phases present in PZN ceramics, an AEM study of polycrystalline samples has been undertaken. Furthermore a clarification of the microchemical ordering situation in PZN has been achieved.
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