定向Pb(Zn/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbTiO/sub 3/单晶的介电性能和相变

Proceedings of the 13th IEEE International Symposium on Applications of Ferroelectrics, 2002. ISAF 2002. Pub Date : 2002-05-28 DOI:10.1109/ISAF.2002.1195958

W. Ren, S-F. Liu, B. Mukherjee

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引用次数: 0

摘要

研究了取向(1-x)Pb(Zn/sub 1/3/Nb/sub 2/3/)O/sub 3/-xPbTiO/sub 3/ (PZN-PT)单晶在x = 4.5%和x = 8%时介电性质和相变随温度的变化规律。这些晶体表现出频率色散，增加模晶中PT含量抑制了弛豫行为的程度。随着偏置场的增大超过一个临界值，四边形-立方体相变温度升高，而菱形-四边形相变温度随偏置场的增大而降低。偏置场可以稳定取向PZN-PT晶体的四方相，从而形成长程有序态并诱导正常的铁电行为。

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Dielectric properties and phase transitions of <001>-oriented Pb(Zn/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbTiO/sub 3/ single crystals

The temperature dependence of dielectric properties and phase transitions of <001> oriented (1-x)Pb(Zn/sub 1/3/Nb/sub 2/3/)O/sub 3/-xPbTiO/sub 3/ (PZN-PT) single crystals for x = 4.5% and x = 8% have been investigated as a function of DC bias field. These crystals exhibit frequency dispersion and increasing the PT content in die crystals suppresses the degree of relaxor behavior. As the bias field increases over a critical value, the temperature of the tetragonal-cubic phase transition increases but the temperature of the rhombohedral-tetragonal phase transition decreases with bias field. A bias field can stabilize the tetragonal phase in <001> oriented PZN-PT crystals resulting in a long-range ordered state and induced normal ferroelectric behavior.

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Proceedings of the 13th IEEE International Symposium on Applications of Ferroelectrics, 2002. ISAF 2002.

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