Anisotropically shaped powder and method for producing the same
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United States of America Patent
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Jul 28, 2015
Grant Date -
Dec 27, 2012
app pub date -
Nov 24, 2010
filing date -
Nov 26, 2009
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Abstract
There is provided an anisotropically shaped powder preferred as plate-like crystals used in the process of producing niobate-based KNbO3—NaNbO3—LiNbO3-based crystal-oriented ceramics and the like, and a method for producing the same. The production method includes, an oxide powder, such as Nb2O5, and a surfactant are added to an aqueous solution of alkali hydroxides, such as NaOH and KOH to perform hydrothermal synthesis, the product obtained after this reaction is washed with an organic solvent, and further, the product after the washing is fired at 170° C. to 700° C. In addition, according to this production method, it is possible to obtain an anisotropically shaped powder having a ratio of an average particle length in a major axis direction to an average particle length in a thickness direction in the range of 2 to 20 and having a pseudo-cubic perovskite structure in which a crystal face is oriented in a (100) plane.
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