Character of order-disorder and displacive components in barium titanate.
Reconciling the apparently contradictory results of NMR and x-ray absorption fine structure measurements on the ferroelectric perovskite BaTiO3 gives insight into the character of the displacive and order-disorder components of the phase transitions of this material. The order-disorder component in the transition consists of local atomic displacements from cubic symmetry of constant magnitude that partially lose long-range order, while the displacive component consists of reorientation of these displacements.
Physics Department, Box 351560, University of Washington, Seattle, Washington 98195, USA.
Edward A
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Stern