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Issue 6, 2018
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Structural and morphological evolution of an octahedral KNbO3 mesocrystal via self-assembly-topotactic conversion process

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Abstract

Different morphologies of potassium niobates were prepared via a novel two-step solvothermal process. Firstly, a precursor polyion solution of [Nb6O19]8− was prepared. Secondly, the different morphologies of potassium niobates were prepared by solvothermal treatment of the polyion solution in different water–organic solvents and adjusting the composition of the solvents. A meaningful KNbO3 (KN) mesocrystal with octahedral morphology was generated for the first time using propylamine as the solvent. The as-obtained KN mesocrystal was a polycrystal constructed from uniform [110]-crystal-axis-oriented KN nanocube crystals, which show a set of single-crystal-like electron diffraction spots. The KN mesocrystal was formed via a self-assembly-topotactic conversion mechanism including the self-assembly of plate-like particles, topotactic conversion to the KN structure and mesocrystalline crystal growth of KN nanocrystals. Such mesocrystal displays a higher piezoelectric response than common individual perovskite crystals. The success in developing the KN mesocrystal can be easily applied to the preparation of a series of piezoelectric K1−xNaxNbO3 continuous solid solution mesocrystals.

Graphical abstract: Structural and morphological evolution of an octahedral KNbO3 mesocrystal via self-assembly-topotactic conversion process

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Publication details

The article was received on 04 Dec 2017, accepted on 22 Dec 2017 and first published on 02 Jan 2018


Article type: Paper
DOI: 10.1039/C7CE02094E
Citation: CrystEngComm, 2018,20, 728-737
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    Structural and morphological evolution of an octahedral KNbO3 mesocrystal via self-assembly-topotactic conversion process

    D. Hu, W. Zhang, F. Yao, F. Kang, H. Cheng, Y. Wang, X. Kong, P. Wen and Q. Feng, CrystEngComm, 2018, 20, 728
    DOI: 10.1039/C7CE02094E

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