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Journal of Materials Science

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27-02-2017 | Original Paper

The microstructural evolution in high sodium epitaxial sodium potassium niobate films deposited by low-temperature hydro-thermal method

Authors: P. S. Sankara Rama Krishnan, Takahisa Shiraishi, Hiroshi Funakubo

Published in: Journal of Materials Science | Issue 12/2017

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Abstract

Sodium potassium niobate [(K_xNa_1−x)NbO₃] films with high sodium composition (x = 0.06 and 0.24) were fabricated using a low-temperature (240 °C) hydro-thermal method on (001) niobium-doped strontium titanate (Nb-STO) substrate. The films were annealed subsequently at 600 °C. Thicknesses of the films were maintained in the range of ~800–1000 nm. Transmission electron microscopy-selected area electron diffraction studies revealed the appearance of super-spots, thereby confirming the tilting of the oxygen sub-lattice at both high Na compositions. The bright-field imaging and scanning transmission electron microscopy-energy dispersive spectroscopy elemental mapping revealed KNN film with K-rich interfacial regions and Na-rich top region of the film at both the high Na composition, whereas the potassium niobate (KNbO₃, x = 1) film showed no such oxygen sub-lattice tilting, and a sharp substrate-film interface was observed. The observed tilting of oxygen sub-lattice is a direct consequence of the reduced structural stability in high Na compositions in the KNN solid solutions.

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Title: The microstructural evolution in high sodium epitaxial sodium potassium niobate films deposited by low-temperature hydro-thermal method
Authors: P. S. Sankara Rama Krishnan
Takahisa Shiraishi
Hiroshi Funakubo
Publication date: 27-02-2017
Publisher: Springer US
Published in: Journal of Materials Science / Issue 12/2017
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-017-0927-7

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