期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 27, 期 13-15, 页码 4085-4092出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2007.02.099
关键词
platelike KNbO3 particle; niobates perovskites; piezoelectric properties
Polycrystalline rectangular-platelike KNbO3 particles with an orthorhombic perovskite structure were synthesized by the topochemical microcrystal conversion (TMC) method from rectangular-platelike precursor particles of layer-structured K4Nb6O17 at 850 degrees C in molten KCl-salt. TMC-synthesized KNbO3 particles preserved the shape of precursor particles, and had a thickness of about I pm, a width of 5-10 mu m and a length of 20-40 mu m. However. TMC-synthesized rectangular-platelike KNbO3 particles exhibited a polycrystalline morphology having preferred pseudo-cubic {0 0 1} orientation. Oriented particulate layer (OPL) X-ray diffraction analysis revealed that, in the TMC reaction, the crystallographic {010} plane of K4Nb6O17, which is the largest extensive face, is converted into the {0 01} plane of polycrystalline KNbO3 particles, which is the largest developed face, in spite of polycrystalline morphology. Using the polycrystalline rectangular-platelike KNbO3 particles as template in the reactive templated grain growth method, gram-oriented (K0.5Na0.5)NbO3-1 m01% CuO ceramics having a pseudo-cubic {0 01} orientation degree (Logering's factor) of 39.7% could be fabricated. The result indicates that not only single crystalline particles, which were generally used, but also the polycrystalline particles can be act as template in the templated grain growth process. The availability of polycrystalline particles will give a new synthesis design of templates for texturing of various kinds of ceramics. (c) 2007 Elsevier Ltd. All rights reserved.
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