Ferroelectric ceramics in the Na/sub 0.5/Bi/sub 0.5/TiO/sub 3/-K/sub 0.5/Bi/sub 0.5/TiO/sub 3/, Na/sub 0.5/Bi/sub 0.5/TiO/sub 3/-PbTiO/sub 3/ and K/sub 0.5/Bi/sub 0.5/TiO/sub 3/-PbTiO/sub 3/ systems

Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics Pub Date : 1994-08-07 DOI:10.1109/ISAF.1994.522351

O. Elkechai, J. P. Mercurio

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Abstract

The study of the Na/sub 0.5/Bi/sub 0.5/TiO/sub 3/-K/sub 0.5/Bi/sub 0.5/TiO/sub 3/, Na/sub 0.5/Bi/sub 0.5/TiO/sub 3/-PbTiO/sub 3/ and K/sub 0.5/Bi/sub 0.5/TiO/sub 3/-PbTiO/sub 3/ systems was carried our using X-ray diffraction, DSC and dielectric measurements. The limits of the rhombohedral (Na/sub 0.5/Bi/sub 0.5/TiO/sub 3/-rich side) and orthorhombic (K/sub 0.5/Bi/sub 0.5/TiO/sub 3/, and PbTiO/sub 3/-rich side) solid solutions were determined, as well as the evolutions of their lattice parameters as a function of composition. Ceramic materials have been prepared by natural sintering (1090-1220/spl deg/C/0.5 h) of powders obtained by solid state reaction (900-1000/spl deg/C/20 h) of the corresponding oxides and carbonates. The dielectric permittivities of these materials have been measured in a wide frequency range between 20 and 800/spl deg/C. The results showed that they all are ferroelectric at room temperature and some of them exhibit a relaxer-type behaviour. Several specular compositions showed the best piezoelectric characteristics for this type of ceramic materials.

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采用x射线衍射、DSC和介电测量对Na/sub 0.5/Bi/sub 0.5/TiO/sub 3/-K/sub 0.5/Bi/sub 0.5/TiO/sub 3/、Na/sub 0.5/Bi/sub 0.5/TiO/sub 3/-PbTiO/sub 3/和K/sub 0.5/Bi/sub 0.5/TiO/sub 3/-PbTiO/sub 3/体系进行了研究。确定了菱形固溶体(Na/sub 0.5/Bi/sub 0.5/TiO/sub 3/富侧)和正交体(K/sub 0.5/Bi/sub 0.5/TiO/sub 3/和PbTiO/sub 3/富侧)的极限，以及它们的晶格参数随组成的变化规律。将相应的氧化物和碳酸盐固相反应(900 ~ 1000/spl℃/20 h)得到的粉末自然烧结(1090 ~ 1220/spl℃/0.5 h)制备陶瓷材料。这些材料的介电常数已在20至800/spl度/C的宽频率范围内测量。结果表明，它们在室温下都是铁电的，其中一些表现出弛豫型行为。几种镜面组合物在这类陶瓷材料中表现出最好的压电特性。

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Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics

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