Fast proton conducting glasses: Creation by proton implantation and a requirement for fast proton conduction
- Tokyo Institute of Technology, Materials and Structures Laboratory, Nagatsuta, Midori-ku, Yokohama 226 (Japan)
- Nagoya University, Energy Technology and Science, Furo-cho, Chikusa-ku, Nagoya 460-01 (Japan)
- Nagoya Institute of Technology, Department of Materials Science and Technology, Gokiso-cho, Showa-ku, Nagoya 466 (Japan)
Fast proton conducting glasses have been obtained in Mg(PO{sub 3}){sub 2} glasses by implantation of protons at 120 keV to a fluence of 1{times}10{sup 18} cm{sup {minus}2}. The dc conductivity and the activation energy of the conduction in the implanted glasses are 5{times}10{sup {minus}4} scm{sup {minus}1} at room temperature and 0.18 eV, respectively. No fast proton conduction was observed for H{sup +}-implanted SiO{sub 2} and Ca(PO{sub 3}){sub 2} glasses. Infrared absorption spectra revealed that implanted protons are present in the form of X{endash}OH (X=Si or P) in SiO{sub 2} and Ca(PO{sub 3}){sub 2} glasses implanted with H{sup +} ions to 1{times}10{sup 18} cm{sup {minus}2}, but exist as POH groups and molecular water H{sub 2}O in Mg(PO{sub 3}){sub 2} glasses. A quantitative discussion on the proton conductivity led to the conclusion that the coexistence of acidic groups such as POH and molecular water H{sub 2}O is a structural requirement for the emergence of fast proton conduction in oxide glasses. The formation of H{sub 2}O in Mg(PO{sub 3}){sub 2} was understood by considering its thermodynamic stability over SiO{sub 2} and Ca(PO{sub 3}){sub 2} glasses. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 450229
- Journal Information:
- Journal of Applied Physics, Vol. 81, Issue 3; Other Information: PBD: Feb 1997
- Country of Publication:
- United States
- Language:
- English
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