Physics and Physicochemistry of Highly Condensed Matter /Physique et Physicochimie de la Matière très Condensée

J. Phys. Colloques 45 (1984) C8-405-C8-406
DOI: 10.1051/jphyscol:1984873

PRESSURE SENSOR FOR LOW TEMPERATURE USE

D. Fabre et M.M. Thiéry

Laboratoire des Interactions Moléculaires et des Hautes Pressions, CNRS, Université Paris-Nord, 93430 Villetaneuse, France

Résumé
On a utilisé pour mesurer la pression jusqu'à 13 kbar, à basse température, la fluorescence d'un cristal de saphir dopé au titane. Les deux raies utilisées correspondent à des transitions purement électroniques de l'ion titane ; leur déplacement vers le bleu, avec la pression, est de 7,9 et 7,8 ± 0,3 cm^-1 kbar^-1 à 4K, et, de 8,5 et 8,4 ± 0,2 cm^-1 kbar^-1 à 77K.

Abstract
The fluorescence of a titanium doped sapphire crystal is used in low temperature experiments as a pressure sensor up to 13 kbar. With increasing pressure, the two zero phonon lines of the Ti ³⁺ ion show a linear blue shift in the investigated pressure range ; the pressure coefficients are 7.9 and 7.8 ± 0.3 cm^-1 kbar^-1 at 4K, and, 8.5 and 8.4 ± 0.2 cm^-1 kbar^-1 at 77K.

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