AC (102-3*105 Hz) measurements have been performed on Sawyer premium-quality synthetic quartz oriented along the z axis, in the temperature range between 240 and 1500 K. The samples were both 'as-received' and X-rayed, in the case of the lower-temperature measurements. The results confirm that the conductivity, in the temperature range considered, is essentially due to extrinsic phenomena, i.e. to the dissociation of Al-Na substitutional centres and to the migration process of alkali ions. An interpretative scheme is proposed, which involves the detailed structure of the attractive potential of Na+ ion in the vicinity of an aluminium impurity and the increase in the radius of the z-axis channels in the beta -quartz-to-tridymite transition.

Martini, M., Paleari, A., Spinolo, G., & Vedda, A. (1990). NEW HIGH-TEMPERATURE RESULTS ON THE IONIC-CONDUCTIVITY OF QUARTZ AND IMPLICATIONS ON THE TRANSPORT MECHANISMS. JOURNAL OF PHYSICS. CONDENSED MATTER, 2(33), 6921-6927 [10.1088/0953-8984/2/33/004].

NEW HIGH-TEMPERATURE RESULTS ON THE IONIC-CONDUCTIVITY OF QUARTZ AND IMPLICATIONS ON THE TRANSPORT MECHANISMS

MARTINI, MARCO;PALEARI, ALBERTO MARIA FELICE;SPINOLO, GIORGIO MARIO;VEDDA, ANNA GRAZIELLA
1990

Abstract

AC (102-3*105 Hz) measurements have been performed on Sawyer premium-quality synthetic quartz oriented along the z axis, in the temperature range between 240 and 1500 K. The samples were both 'as-received' and X-rayed, in the case of the lower-temperature measurements. The results confirm that the conductivity, in the temperature range considered, is essentially due to extrinsic phenomena, i.e. to the dissociation of Al-Na substitutional centres and to the migration process of alkali ions. An interpretative scheme is proposed, which involves the detailed structure of the attractive potential of Na+ ion in the vicinity of an aluminium impurity and the increase in the radius of the z-axis channels in the beta -quartz-to-tridymite transition.
Articolo in rivista - Articolo scientifico
ionic conductivity;quartz; alkali ions
English
6921
6927
7
Martini, M., Paleari, A., Spinolo, G., & Vedda, A. (1990). NEW HIGH-TEMPERATURE RESULTS ON THE IONIC-CONDUCTIVITY OF QUARTZ AND IMPLICATIONS ON THE TRANSPORT MECHANISMS. JOURNAL OF PHYSICS. CONDENSED MATTER, 2(33), 6921-6927 [10.1088/0953-8984/2/33/004].
Martini, M; Paleari, A; Spinolo, G; Vedda, A
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/31798
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