Controllable Hydrothermal Synthesis of KTa1−xNbxO3 Nanostructures with Various Morphologies and Their Growth Mechanisms

详细信息    查看全文

• 作者：Yongming Hu ; Haoshuang Gu ; Zhenglong Hu ; Wenning Di ; Ying Yuan ; Jing You ; Wanqiang Cao ; Yu Wang ; H. L. W. Chan
• 刊名：Crystal Growth & Design
• 出版年：2008
• 出版时间：March 2008
• 年：2008
• 卷：8
• 期：3
• 页码：832 - 837
• 全文大小：1004K
• 年卷期：v.8,no.3(March 2008)
• ISSN：1528-7505

文摘

Various single-crystalline nanostructures of potassium tantalite-niobate (KTa_1−xNb_xO₃, KTN) were synthesized by a hydrothermal method at 200 °C. Interesting structures including KTaO₃ nano-octahedrons, KTa_0.5Nb_0.5O₃, KTa_0.35Nb_0.65O₃, and KTa_0.77Nb_0.23O₃ nanocubes, KTa_0.25Nb_0.75O₃ tower-like nanostructures, and KNbO₃ truncated octahedrons were obtained. The amount of KOH and polyethylene glycol (PEG) is crucial for the formation of pure phase KTa_1−xNb_xO₃ with specific morphologies. The dissolution−precipitation growth mechanism should be accountable for the formation of perfect KTN cubes, and the competition between the supersaturation ratio and the surface energies of nanoclusters may react to the growth of octahedron and truncated octahedron KTN. The experimental results show that the formation of high-quality single-crystalline KTN with tower-like nanostructures may be ascribed to the oriented attachment mechanism.