Unusual ferroelastic behavior in ferroelectric lead bismuth nioebte (PbBi2Nb2O9) |
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| Authors: | O. Delaporte G. R. Barsch L. E. Cross E. Ryba |
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| Affiliation: | a Materials Research Laboratory, The Pennsylvania State University, University Park, PA, USAb Department of Materials Science, The Pennsylvania State University, University Park, PA, USA |
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| Abstract: | X-ray and optical measurements are used to show that the spontaneous strain (b/a-1) and optical birefringence Δnab in single crystals of ferroelectric PbBi2Nb2O9 are a function of the state of electrical poling, going to a zero in the unpoled state. In poled crystals all spontaneous strain is lost at a temperature ≃200°C below the dielectric Curie temperature in a manner reminiscent of the behavior of the perovskite relaxor ferroelectrics which have diffuse phase transitions. |
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