TY - JOUR
T1 - Epitaxial thin films of ATiO 3-xH x (A = Ba, Sr, Ca) with metallic conductivity
AU - Yajima, Takeshi
AU - Kitada, Atsushi
AU - Kobayashi, Yoji
AU - Sakaguchi, Tatsunori
AU - Bouilly, Guillaume
AU - Kasahara, Shigeru
AU - Terashima, Takahito
AU - Takano, Mikio
AU - Kageyama, Hiroshi
N1 - Generated from Scopus record by KAUST IRTS on 2022-09-13
PY - 2012/5/30
Y1 - 2012/5/30
N2 - Epitaxial thin films of titanium perovskite oxyhydride ATiO 3-xH 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 0.5Ta 0.5O 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 2.75H 0.25). The electric resistivity of all the ATiO 3-xH x films exhibited metallic (positive) temperature dependence, as opposed to negative as in BaTiO 3-xH x powder, revealing that ATiO 3-xH 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. © 2012 American Chemical Society.
AB - Epitaxial thin films of titanium perovskite oxyhydride ATiO 3-xH 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 0.5Ta 0.5O 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 2.75H 0.25). The electric resistivity of all the ATiO 3-xH x films exhibited metallic (positive) temperature dependence, as opposed to negative as in BaTiO 3-xH x powder, revealing that ATiO 3-xH 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. © 2012 American Chemical Society.
UR - https://pubs.acs.org/doi/10.1021/ja302465c
UR - http://www.scopus.com/inward/record.url?scp=84861637832&partnerID=8YFLogxK
U2 - 10.1021/ja302465c
DO - 10.1021/ja302465c
M3 - Article
SN - 0002-7863
VL - 134
SP - 8782
EP - 8785
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 21
ER -