Relation between the optical extinction orientations corresponding to the polarizations for various phases and domains projected on the (001) plane.
Dielectric permittivities of ZFH and FR-ZFH measured at .
Frequency vs . is the temperature corresponding to (ZFH) maximum in the region of . The solid and dashed lines are, respectively, fittings of Eqs. (1) and (2) with parameters given in the figure.
(Color) Domain structures observed in the FR-ZFH at 198 and .
⟨002⟩ x-ray diffraction spectra with and without a prior -field poling along . The calculated lattice parameters and possible symmetries are given in the figure. and represent, respectively, tetragonal and monoclinic symmetries.
Optical transmission without poling and with a prior poling at .
Refractive indices measured at room temperature. The curves are fittings of the Cauchy equation with parameters given in Table I.
The Cauchy equations of and measured at room temperature without poling and with a prior dc -field poling at , where is in .
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