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Abstract
Measurements of the optic index of refraction, along the c axis, are presented for three representative single crystals in the (PbxBa 1-x) Nb2O6 ferroelectric system. In particular, we show that as the temperature is lowered, crystals at the morphotropic phase boundary (x=0.63±0.03) first develop a polarization along the c axis and then, at lower temperature, the polarization rotates to the ab plane.
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