Theoretical design and experimental study of hydrothermal synthesis of KNbO3 |
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Authors: | Xiangyun Han Duanming Zhang Zhicheng Zhong Nian Wei Zhihua Li |
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Institution: | a Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, China b Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei 430074, China |
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Abstract: | In the framework of the Lencka-Riman thermodynamic model, we give a theoretical design for the hydrothermal synthesis of pure KNbO3 powder in a K-Nb-O tri-component system, where the stability yield diagrams and the optimum conditions (i.e., synthesis temperature, precursor concentrations, solution pH) are provided. Additionally, a hydrothermal experiment is carried out to synthesize KNbO3 powder by reacting niobium pentoxide with potassium hydroxide at a temperature above 523 K and highly alkaline conditions. It is found that the experiment is in great agreement with the theoretical design. This research shows that the newly developed Lencka-Riman model is a powerful theoretical tool for designing hydrothermal synthesis of new materials. |
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Keywords: | A Electronic materials B Chemical synthesis D Phase equilibria |
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