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Diffusion of proton in alumina-rich nonstoichiometric magnesium aluminate spinel

Authors:	Y Okuyama N Kurita N Fukatsu

Institution:	(1) Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan;(2) Department of Environment and Materials Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

Abstract:	The phenomenon of the diffusion of proton and deuteron in a single crystal of magnesium aluminate spinel was studied by infrared absorption. The chemical diffusion coefficient of proton was determined by the relaxation time of the absorption intensity upon the substitution of deuteron with proton. The temperature dependence of the chemical diffusion coefficient of proton for ${\text{Mg}}_{{\text{1}} - x} {\text{Al}}_{\text{2}} {\text{O}}_{{\text{4}} - {\text{ $ \delta $ }}} \left( {x = 0.34} \right)$ was expressed as $\tilde D = 0.16\exp \left( {{{ - 210 \times 10^3 \left( {{\text{J mol}}^{ - {\text{1}}} {\text{K}}^{ - {\text{1}}} } \right)} \mathord{\left/ {\vphantom {{ - 210 \times 10^3 \left( {{\text{J mol}}^{ - {\text{1}}} {\text{K}}^{ - {\text{1}}} } \right)} {{\text{RT}}}}} \right. \kern-\nulldelimiterspace} {{\text{RT}}}}} \right){{{\text{cm}}^2 } \mathord{\left/ {\vphantom {{{\text{cm}}^2 } {\text{s}}}} \right. \kern-\nulldelimiterspace} {\text{s}}}$ . The chemical diffusion coefficient of proton was found to be independent of the composition of spinel and of the atmosphere. Paper presented at the 11th Euro Conference on the Science and Technology of Ionics, Batz-sur-Mer, Sept. 9–15 2007.

Keywords:	Drift mobility of proton Diffusion pair Spinel Magnesium conductor IR absorption
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