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首页> 外文期刊>Journal of Materials Research >Crystal structure and compositional analysis of epitaxial (K_(0.56)Na_(0.44)) NbO_3 films prepared by hydrothermal method
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Crystal structure and compositional analysis of epitaxial (K_(0.56)Na_(0.44)) NbO_3 films prepared by hydrothermal method

机译：水热法制备外延（K_（0.56）Na_（0.44））NbO_3薄膜的晶体结构和组成分析

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摘要

(K_xNa_(1-x))NbO_3 films were deposited on Nb-doped (100)SrTiO_3 substrates at 240 ℃ 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 (K_(0.75)Na_(0.25))NbO_3. 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 (K_(0.36)Na_(0.64))NbO_3. 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.
机译：（K_xNa_（1-x））NbO_3膜通过水热法在240℃下沉积在掺Nb（100）SrTiO_3衬底上1到6 h。在这个时间序列上，发现膜的测量的（K + Na）/ Nb比率保持恒定，但是体积K /（K + Na）比率x从初始值0.75-0.56降低。可以确定，膜的生长最初是通过富K相（K_（0.75）Na_（0.25））NbO_3的结晶来进行的。对于大于3小时的薄膜生长时间，检测到第二个钙钛矿相，其晶胞体积较小，估计组成为（K_（0.36）Na_（0.64））NbO_3。这样，与源自单一相相反，测得的本体组成值x ＝ 0.56被确定为这两个相的组合的结果。制备的薄膜经过6个小时的截面透射电子显微镜分析表明，它们在垂直于基材的方向上由两层组成；这种双层结构，仅在这种材料的水热生长中观察到，被认为是由于Nb前体与KOH和NaOH在生长溶液中的溶解度不匹配而引起的。

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  • 来源
    《Journal of Materials Research》 |2016年第6期|693-701|共9页
  • 作者

    Takahisa Shiraishi; Hiro Einishi; Takao Shimizu; Hiroshi Funakubo; Minoru Kurosawa; Hiroshi Uchida; Nobuhiro Kumada; Takanori Kiguchi; Toyohiko J. Konno;

  • 作者单位

    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;

    Department of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8502, Kanagawa, Japan;

    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;

    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;

    Department of Information Processing, Tokyo Institute of Technology, Yokohama 226-8502, Kanagawa, Japan;

    Department of Materials and Life Sciences, Sophia University, Chiyoda, 102-8554, Tokyo, Japan;

    Center for Crystal Science and Technology, University of Yamanashi, Koufu, 400-8510, Yamanashi, Japan;

    Institute for Material Research, Tohoku University, Sendai 980-8577, Miyagi, Japan;

    Institute for Material Research, Tohoku University, Sendai 980-8577, Miyagi, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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