Epitaxial thin films of ATiO(3-x)H(x) (A = Ba, Sr, Ca) with metallic conductivity

Journal of the American Chemical Society
Takeshi YajimaHiroshi Kageyama

Abstract

Epitaxial thin films of titanium perovskite oxyhydride ATiO(3-x)H(x) (A = Ba, Sr, Ca) were prepared by CaH(2) reduction of epitaxial ATiO(3) thin films deposited on a (LaAlO(3))(0.3)(SrAl(0.5)Ta(0.5)O(3))(0.7) substrate. Secondary ion mass spectroscopy detected a substantial amount and uniform distribution of hydride within the film. SrTiO(3)/LSAT thin film hydridized at 530 °C for 1 day had hydride concentration of 4.0 × 10(21) atoms/cm(3) (i.e., SrTiO(2.75)H(0.25)). The electric resistivity of all the ATiO(3-x)H(x) films exhibited metallic (positive) temperature dependence, as opposed to negative as in BaTiO(3-x)H(x) powder, revealing that ATiO(3-x)H(x) are intrinsically metallic, with high conductivity of 10(2)-10(4) S/cm. Treatment with D(2) gas results in hydride/deuteride exchange of the films; these films should be valuable in further studies on hydride diffusion kinetics. Combined with the materials' inherent high electronic conductivity, new mixed electron/hydride ion conductors may also be possible.

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Citations

Oct 23, 2012·Inorganic Chemistry·Tatsunori SakaguchiHiroshi Kageyama
Nov 21, 2015·Nature Chemistry·Takeshi YajimaHiroshi Kageyama
Dec 10, 2016·Journal of the American Chemical Society·Xiuquan ZhouEfrain E Rodriguez
Jan 27, 2017·Chemistry : a European Journal·Hugo BarrouxRomain Gautier
Jul 3, 2015·Chemical Communications : Chem Comm·Daniel D TaylorEfrain E Rodriguez
Mar 10, 2018·Angewandte Chemie·Lun JinMichael A Hayward
Jul 12, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·T OnozukaT Hasegawa
Feb 1, 2018·Science and Technology of Advanced Materials·Yoji KobayashiHiroshi Kageyama
May 8, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Yingfen WeiWenhui Xie
May 4, 2017·Angewandte Chemie·Julie L Fenton, Raymond E Schaak
Jul 25, 2017·The Journal of Chemical Physics·Nobuya SatoShinji Tsuneyuki
May 10, 2020·Physical Review Letters·Liang SiKarsten Held
Oct 3, 2018·Chemical Communications : Chem Comm·Ryo NakayamaHiroshi Kitagawa
Jan 14, 2021·Angewandte Chemie·Alexander MutschkeNathalie Kunkel
Jun 1, 2021·Chemistry of Materials : a Publication of the American Chemical Society·Rasmus LavénMaths Karlsson
Jan 17, 2015·Inorganic Chemistry·Takafumi YamamotoHiroshi Kageyama
Feb 26, 2019·Journal of the American Chemical Society·Xin LiuReidar Haugsrud
Nov 23, 2019·Journal of the American Chemical Society·Masaaki KitanoHideo Hosono
Aug 17, 2018·Inorganic Chemistry·Olivier J HernandezHiroshi Kageyama
May 24, 2019·ACS Applied Materials & Interfaces·Thomas OrvisJayakanth Ravichandran

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