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Phase transitions and ferroelectric properties of lead ferroniobate

Journal Article · · Inorg. Mater. (Engl. Transl.); (United States)
OSTI ID:6293271
The purpose of this work was to determined the value of spontaneous polarization accurately and to obtain additional information about phase transitions in perovskite lead ferroniobate, in particular, about the effect on the electric characteristics of the ceramic. The measured values of the spontaneous polarization of PbFe/sub 0.5/Nb/sub 0.5/O/sub 3/ agree with the theoretical calculations; they are significantly higher than assumed previously, and comparable to those for P/sub 5/PbFe/sub 0.5/Ta/sub 0.5/O/sub 3/. In studying the electrophysical properties of PbFe/sub 0.5/Nb/sub 0.5/O/sub 3/ it is necessary to take into account their strong dependence on the specific conductivity, which in its turn depends on the conditions under which the ceramic is prepared. The results of dielectric and pyroelectric measurements as well as the study of the electrical conductivity, dielectric hysteresis lopps, and EPR spectra confirmed the existence of a transition in PbFe/sub 0.5/Nb/sub 0.5/O/sub 3/ between two ferroelectric phases in the region 355-360 K. This transition can significantly affect the electrophysical characteristics of the ceramic.
Research Organization:
Rostov-on-Don State Univ. (USSR)
OSTI ID:
6293271
Journal Information:
Inorg. Mater. (Engl. Transl.); (United States), Journal Name: Inorg. Mater. (Engl. Transl.); (United States) Vol. 24:2; ISSN INOMA
Country of Publication:
United States
Language:
English