用两步合成法制备了（１－ｘ）Ｐｈ（Ｎｉ１／３Ｎｂ２／３）Ｏ３－ｘＰｂＴｉＯ３（ｘ＝０．３０～０．４０）陶瓷，对其相 结构和介电性能进行了研究．ＸＲＤ分析表明，准同型相界在ＰＴ含量ｘ＝０．３４～０．３８范围内． 介电性能研究结果表明；组成在准同型相界处的试样，其介电常数呈现最大值．同时还发现， 准同型相界处的陶瓷出现介电双峰，其中一个为弛豫型铁电相向顺电相转变的相变峰；另一个 介电峰处于１３０～１５０℃的高温区，可能是由镍离子变价、相结构变化等缺陷引起的松弛极化 产生的．
(1-x)PNN-xPT(x=0.30～0.40) ceramics were prepared by a two-steps synthesis method. Phase structure and dielectric properties were studied.
Morphotropic phase boundary exists in (1-x)PNN-xPT system at about x=0.34～0.38 composition range according to XRD analysis. Dielectric properties
measurments showed that the optimum value of dielectric constant was obtained and the phenomenon of dielectric dual peaks was found for composition near the
morphotropic phase boundary. One dielectric peak is phase transition peak from relaxor ferroelectric phase to paraelectric phase. The other peak lying in 130～150℃ temperature range results from relaxational polarization
of the valence change of Ni ion and kinds of defects in (1-x)PNN-xPT system.
参考文献
| [1] | Guo R, Bhalla A S, Randall C A, et al. J. Appl. Phys., 1990, 67 (10): 6405--6410. [2] Lu hanh, Kenji Uchino, Shoichior Nomura. Jpn. J. Appl. Phys., 1978, 17 (4): 637--641. [3] Takahashi S, Miyao S, et al. Jpn. J. Appl. Phys., 1993, 32 (9B): 4245--4248. [4] Smolenskii G A. Jpn. J. Phys. Soc., 1970, 28, suppl: 26--37. [5] Pilgrim S M, Sutherland A E, Winzer S R. J. Am. Ceram. Soc., 1990, 73 (10): 3122--3125. [6] 姚熹，陈至立. 压电与声光, 1984, 6: 1--11. [7] 樊慧庆. 弛豫型铁电体的宏观介电性能与极化机制研究. 西安交通大学博士学位论文，(1998). [8] Dai X, Digivanni A, Vieland D. J. Appl. Phys., 1993, 74 (5): 3399--3405. [9] Yoon M-S, Jang H M. J. Appl. Phys., 1995, 77 (8): 3391--4001. [10] 张良莹, 姚熹编著. 电介质物理学. 西安交通大学出版社，1991. [11] 关振铎, 张中太, 焦金生编著. 无机材料物理性能. 北京: 清华大学出版社，1992. |
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