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Crystal structure and compositional analysis of epitaxial (K0.56Na0.44)NbO3 films prepared by hydrothermal method

Published online by Cambridge University Press:  07 March 2016

Takahisa Shiraishi ,
Hiro Einishi ,
Takao Shimizu ,
Hiroshi Funakubo ,
Minoru Kurosawa ,
Hiroshi Uchida ,
Nobuhiro Kumada ,
Takanori Kiguchi  and
Toyohiko J. Konno
Takahisa Shiraishi
Affiliation:
Department of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8502, Kanagawa, Japan; and Institute for Material Research, Tohoku University, Sendai 980-8577, Miyagi, Japan
Hiro Einishi
Affiliation:
Department of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8502, Kanagawa, Japan
Takao Shimizu
Affiliation:
Department of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8502, Kanagawa, Japan; and Materials Research Center for Element Strategy (Tokyo Tech MCES), Yokohama 226-8502, Kanagawa, Japan
Hiroshi Funakubo*
Affiliation:
Department of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8502, Kanagawa, Japan; and Materials Research Center for Element Strategy (Tokyo Tech MCES), Yokohama 226-8502, Kanagawa, Japan
Minoru Kurosawa
Affiliation:
Department of Information Processing, Tokyo Institute of Technology, Yokohama 226-8502, Kanagawa, Japan
Hiroshi Uchida
Affiliation:
Department of Materials and Life Sciences, Sophia University, Chiyoda, 102-8554, Tokyo, Japan
Nobuhiro Kumada
Affiliation:
Center for Crystal Science and Technology, University of Yamanashi, Koufu, 400-8510, Yamanashi, Japan
Takanori Kiguchi
Affiliation:
Institute for Material Research, Tohoku University, Sendai 980-8577, Miyagi, Japan
Toyohiko J. Konno
Affiliation:
Institute for Material Research, Tohoku University, Sendai 980-8577, Miyagi, Japan
*
a)Address all correspondence to this author. e-mail: funakubo.h.aa@m.titech.ac.jp
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Abstract

(KxNa1−x)NbO3 films were deposited on Nb-doped (100)SrTiO3 substrates at 240 °C for times between 1 and 6 h by a hydrothermal method. Over this time series, the measured (K + Na)/Nb ratio of the films was found to remain constant, but the bulk K/(K + Na) ratio, x, decreased from an initial value of 0.75–0.56. It was determined that film growth initially proceeded through crystallization of the K-rich phase (K0.75Na0.25)NbO3. For film growth times greater than 3 h, a second perovskite phase with a smaller unit cell volume was detected, with an estimated composition of (K0.36Na0.64)NbO3. As such, the measured bulk composition value x = 0.56 was determined to be the result of a combination of these two phases, as opposed to originating from a single phase. Cross-sectional transmission electron microscopy analyses of films prepared for 6 h revealed that they consist of two layers in the direction normal to the substrate; this bilayer-type structure, only observed for hydrothermal growth of this material, is considered to arise from the large solubility mismatch between the Nb precursor and KOH and NaOH in the growth solution.

Keywords

hydrothermalcrystallographic structurefilm
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 6 , 28 March 2016 , pp. 693 - 701
Copyright
Copyright © Materials Research Society 2016 

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