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Synthesis and Mechanism of Ferroelectric Potassium Tantalate Niobate Nanoparticles by the Solvothermal and Hydrothermal Processes
Author(s) -
Wei Nian,
Zhang DuanMing,
Han XiangYun,
Yang FengXia,
Zhong ZhiCheng,
Zheng KeYu
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01628.x
Subject(s) - tantalate , hydrothermal circulation , materials science , nanoparticle , crystallite , tetragonal crystal system , transmission electron microscopy , potassium niobate , chemical engineering , solvothermal synthesis , scanning electron microscope , hydrothermal synthesis , ferroelectricity , nanotechnology , mineralogy , crystallography , crystal structure , chemistry , composite material , optoelectronics , metallurgy , dielectric , engineering
High‐purity KTa 0.3 Nb 0.7 O 3 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 KTa 0.3 Nb 0.7 O 3 shows a pseudo‐cubic to tetragonal transition with increasing crystallite size. It is believed that supercritical isopropanol plays an important role in synthesizing KTa 0.3 Nb 0.7 O 3 nanoparticles under milder conditions than the hydrothermal route. The present solvothermal method provides a new potential route for synthesizing ferroelectric potassium tantalate niobate material.