Kamzina L. S.1
1Ioffe Institute, St. Petersburg, Russia
Email: ASKam@mail.ioffe.ru
The relationship between depolarization temperature Td and polymorphic phase transition temperature TF-R in poorly studied relaxor hot-pressed ceramics (K0.5Na0.5)·NbO_3-0.02Ba2NaNb5O15 was studied. Dielectric and optical properties of polarized samples were measured for this purpose. It was found that the temperatures Td and TF-R do not match. The obtained results are discussed in terms of the degree of the phase transition diffuseness and the size of the polar regions. It is suggested that the relative position of the depolarization temperature and the temperature of transition of the polarized sample to the relaxor phase TF-R does not depend on the type of phase boundary (polymorphic or morphotropic), but is related only to the size of the polar regions. Keywords: lead-free transparent ceramics, polymorphic phase transition, relaxors.
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