Abstract
This chapter discusses that lead zinc niobate PbZnl/3Nb2/303 (PZN) is classified into perovskite-type mixed compounds with formula AB'B"O3. Though PZN possesses excellent properties required for relaxor ferroelectrics, much are left unknown about its crystallography, growth mechanism, and thermal stability. The compound was reported to show rhombohedral symmetry at room temperature. Crystals have never been synthesized through the solid state reaction under the atmospheric pressure. Some past studies assumed that the perovskite-type phase of PZN is unstable at room temperature. However, it was recently reported that single crystals can be grown from the solution with PbO flux, which also enabled a detailed crystallographic study. To understand the nature of relaxor materials, knowledge of the local distortion of the structure is as important as that of the average structure. This chapter investigates the crystal structure of PZN by both the single crystal X-ray diffraction and EXAFS techniques.
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