TY - JOUR
T1 - In situ fabrication of SrTiO3-BaTiO3 layered thin films by hydrothermal-electrochemical technique
AU - Yoshimura, Masahiro
AU - Suchanek, Wojciech L.
AU - Watanabe, Tomoaki
AU - Sakurai, Bungo
N1 - Funding Information:
This research was supported by the “Research for the Future” Program No. 96R06901 of the Japanese Society for the Promotion of Science (JSPS). The authors are greatly indebted to Professor M. Abe, Professor M. Kakihana, Professor M. Yashima, and Dr. J. Frantti (all Tokyo Institute of Technology, Japan) for stimulating discussions.
PY - 1999/6
Y1 - 1999/6
N2 - Layered thin films in the BaTiO3-SrTiO3 system have been fabricated by a hydrothermal-electrochemical method either in a closed autoclave or in a flow system using the titanium substrate and Ba- and Sr-hydroxides or acetates as sources of titanium, barium, and strontium, respectively. The synthesis conditions (temperature in the range of 120-200°C, current density of 1-20 mA/cm2, flow rates of 1-50cm3/min, duration of 1-24h) allowed an easy control of the microstructure of the titanate layers. BaTiO3 layers could be deposited easily on SrTiO3 layers at 150°C (1h, 1mA/cm2) both in the closed autoclave and in the flowing solution. To deposit SrTiO3 layers on BaTiO3 layers, a current density of 10mA/cm2 or preceding water leaching of the BaTiO3 surface were necessary. The multilayered nature of the BaTiO3-SrTiO3 films have been revealed by XRD, AFM, and XPS at various stages of their preparation. Based upon the experimental results, a growth mechanism of the BaTiO3-SrTiO3 double layers has been proposed.
AB - Layered thin films in the BaTiO3-SrTiO3 system have been fabricated by a hydrothermal-electrochemical method either in a closed autoclave or in a flow system using the titanium substrate and Ba- and Sr-hydroxides or acetates as sources of titanium, barium, and strontium, respectively. The synthesis conditions (temperature in the range of 120-200°C, current density of 1-20 mA/cm2, flow rates of 1-50cm3/min, duration of 1-24h) allowed an easy control of the microstructure of the titanate layers. BaTiO3 layers could be deposited easily on SrTiO3 layers at 150°C (1h, 1mA/cm2) both in the closed autoclave and in the flowing solution. To deposit SrTiO3 layers on BaTiO3 layers, a current density of 10mA/cm2 or preceding water leaching of the BaTiO3 surface were necessary. The multilayered nature of the BaTiO3-SrTiO3 films have been revealed by XRD, AFM, and XPS at various stages of their preparation. Based upon the experimental results, a growth mechanism of the BaTiO3-SrTiO3 double layers has been proposed.
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U2 - 10.1016/s0955-2219(98)00433-6
DO - 10.1016/s0955-2219(98)00433-6
M3 - Article
AN - SCOPUS:0032659451
SN - 0955-2219
VL - 19
SP - 1353
EP - 1359
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 6-7
ER -