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The temperature dependence of pyroelectric and dielectric properties was measured for polycrystalline Pb[(Fe 1/3 Sb 2/3 ) x Ti y Zr z ]O 3 where x = 0.1, y = 0.4–0.5 and x + y + z = 1 in the temperature range from 300 K to 650 K. The total pyroelectric effect was determined by measuring the pyroelectric current. The changes of dielectric permittivity ϵ′ confirmed the temperature points of the phase transitions occurring in Pb[(Fe 1/3 Sb 2/3 ) x Ti y Zr z ]O 3 . Two diffused phase transitions are observed in the system. The paraelectric-ferroelectric transition near T m is demonstrated by a maximum of dielectric permittivity. The anomaly on ϵ′(T) dependence near 530 K for y = 0.43 speaks for ferroelectric(tetragonal)-ferroelectric(rhombohedral) phase transition. For y > 0.44 this transition is definitely diffuse and the coexistence of tetragonal and rhombohedral phases is observed in a wide temperature range around 530 K. The temperature dependences of the pyroelectric coefficient confirmed the diffuse character of phase transitions in Pb[(Fe 1/3 Sb 2/3 ) x Ti y Zr z ]O 3 .
Acknowledgments
This work was partially supported by the State Commitee of Scientific research (KBN). The author is grateful to dr W. Osak for suggestions and helpful discussion.