Calorimètre adiabatique à température variable et à surfaces d'échanges sphériques

Mainard, R.; Kleinclauss, J.; Fousse, H

doi:10.1051/rphysap:0197000506082300

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1975

1982

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Cited by 6 publications

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Vibration Spectra, Structure, and Phase Transition in Neodymium and Gadolinium Bromate Enneahydrates

Poulet

Mathieu

Vergnat

et al. 1975

Phys. Stat. Sol. (a)

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Single crystals of ,M(BrO,), . 9 H,O (M = rare earth) are biaxial and therefore cannot have the hexagonal structure that was accepted. Studies of Raman and infrared spectra, of specific heat, of pyroelectricity, and of dielectric constant versus temperature point to a space group C cm2, for the low-temperature phase of the crystals and shovs that a t 66 K an order-disorder transition takes place which is likely due to a change of orientation of the BrOb ions.Les monocristaux de RI(BrO,), . 9 H,O (M = terre rare) ktant biaxes ne peuvent avoir la structure hexagonale admise jusqu'b prksent. L'ktude en fonction de la temperature des spectres de diffusion Raman et d'absorption infrarouge, de la chaleur spkcifique, de la pyroklectriciti: et de la permittiviti: conduit b proposer le groupe d'espace C cm2, poiir les cristaux b basse temperature e t montre qu'b 66 K se produit une transformation ordredksordre due probablement b un changement d'orientation des ions BrO;.

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