Synthesis and Mechanism of Ferroelectric Potassium Tantalate Niobate Nanoparticles by the Solvothermal and Hydrothermal Processes

Autor:	Ke-Yu Zheng, Xiangyun Han, Zhicheng Zhong, Nian Wei, Fengxia Yang, Duanming Zhang
Rok vydání:	2007
Předmět:	Transmission electron microscopy Chemistry Inorganic chemistry Solvothermal synthesis Materials Chemistry Ceramics and Composites Hydrothermal synthesis Nanoparticle Crystallite Ferroelectricity Hydrothermal circulation Tantalate
Zdroj:	Journal of the American Ceramic Society. 90:1434-1437
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1551-2916.2007.01628.x
Popis:	High-purity KTa0.3Nb0.7O3 nanoparticles have been successfully synthesized by hydrothermal and solvothermal methods. The KOH concentration and the solvent composition have significant effects on the final products. The synthesis mechanism was discussed. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy investigations show that the typical samples solvothermally synthesized are nanosized, well crystallized, and single crystalline. The KTa0.3Nb0.7O3 shows a pseudo-cubic to tetragonal transition with increasing crystallite size. It is believed that supercritical isopropanol plays an important role in synthesizing KTa0.3Nb0.7O3 nanoparticles under milder conditions than the hydrothermal route. The present solvothermal method provides a new potential route for synthesizing ferroelectric potassium tantalate niobate material.
Databáze:	OpenAIRE
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