Abstract
The structure and phase transition in lead zinc niobate (PZN) werestudied using very high resolution powder neutron diffraction between 4.2and 450 K. The structure is unequivocally rhombohedral in space groupR3m with a = 4.060 48 Å and α = 89.8693° at 4.2 K. No low symmetry phases were observed, nor was an octahedral tilting transition toR3c as occurs in some parallel systems (e.g. PZT). Within the rhombohedral structure, largeaverage ion displacements were found relative to the rather small spontaneous strains. Onheating, a transition to a cubic perovskite occurs, with a critical temperature of∼384 K.
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