A helium-gas-pressure apparatus with optical-reflectivity detection tested with a spin-transition solid

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, , Citation Jelena Jeftic et al 1999 Meas. Sci. Technol. 10 1059 DOI 10.1088/0957-0233/10/11/314

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Author affiliations

1 Laboratoire de Magnétisme et d'Optique, CNRS UMR 8634, Bâtiment Fermat, Université de Versailles, 45 Avenue des Etats Unis, 78 035 Versailles Cedex, France

2 Groupe Matière Condensée, CNRS UMR 6626, Bâtiment 11A, Université de Rennes, 263 Avenue du General Leclerc, 35 042 Rennes Cedex, France

3 Laboratoire de Physique des Milieux Condensés (Département Hautes Pressions), CNRS UMR 7602, Université Pierre et Marie Curie, 4 Place Jussieu, F-75 252 Paris Cedex 05, France

Dates

  1. Received 9 March 1999
  2. Accepted 22 July 1999

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Abstract

We have constructed a low-temperature helium pressure device that incorporates optical-reflectivity detection and is useful for the study of thermochromic materials. We have tested the device up to 1600 bar (0.16 GPa) and down to 10 K. The performance of the device is illustrated by the results of constant-pressure and constant-temperature runs for the spin-transition solid [Fe(btr)2(NCS)2]·H2O. The data establish a consistent pressure-temperature phase diagram, which is discussed.

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10.1088/0957-0233/10/11/314