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Controllable hydrothermal synthesis of KTa1-xNb xO3 nanostructures with various morphologies and their growth mechanisms

机译:可控水热合成不同形态的KTa1-xNb xO3纳米结构及其生长机理

摘要

Various single-crystalline nanostructures of potassium tantalite-niobate (KTa1-xNbxO3, KTN) were synthesized by a hydrothermal method at 200 °C. Interesting structures including KTaO 3 nano-octahedrons, KTa0.5Nb0.5O3, KTa0.35Nb0.65O3, and KTa0.77Nb 0.23O3 nanocubes, KTa0.25Nb 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 KTa1-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.
机译:通过水热法在200°C的温度下合成了铌酸钽酸钾(KTa1-xNbxO3,KTN)的各种单晶纳米结构。获得了有趣的结构,包括KTaO 3纳米八面体,KTa0.5Nb0.5O3,KTa0.35Nb0.65O3和KTa0.77Nb 0.23O3纳米立方体,KTa0.25Nb 0.75O3塔状纳米结构以及KNbO3截短的八面体。 KOH和聚乙二醇(PEG)的量对于形成具有特定形态的纯相KTa1-xNb xO3至关重要。溶解-沉淀生长机制应负责形成完美的KTN立方体,并且过饱和比与纳米团簇的表面能之间的竞争可能对八面体和截短的八面体KTN的生长起反应。实验结果表明,具有塔状纳米结构的高质量单晶KTN的形成可能归因于定向附着机理。

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