Reference

Thermodynamics of the lanthanide trifluorides

Thermodynamics of the lanthanide trifluorides. V. The heat capacities of dysprosium trifluoride, DyF3, and erbium trifluoride, ErF3, from 5 to 350 K. Flotow, Howard E.; O'Hare, P. A. G. (Argonne Natl. Lab., Argonne, IL 60439, USA). J. Chem. Phys., 80(1), 460-6 (English) 1984. CODEN: JCPSA6. ISSN: 0021-9606. DOCUMENT TYPE: Journal CA Section: 69 (Thermodynamics, Thermochemistry, and Thermal Properties) The heat capacities of pure, well-characterized samples of DyF3 [13569-80-7] and ErF3 [13760-83-3] were detd. by adiabatic calorimetry at 5-350 K. The heat capacities, entropies, enthalpy increments, and the Planck functions - [G°(T) - H°(0)]/T are presented in tabular form at selected temps. to 350 K. The values of the 3 functions were adjusted for the removal of degeneracies assocd. with the magnetic ordering of DyF3 and ErF3 at <5 K. Recommended thermochem. functions at 298.15 K and tables of recommended high-temp. thermodn. functions from 400 K to the m.ps. are given. The excess heat capacities due to the internal electronic energy levels of Dy+3 in DyF3 and of Er+3 in ErF3 were calcd. from calorimetric results. In the case of DyF3, the 8 Kramer's doublets derived from spectroscopic measurements were used to calc. an excess heat capacity which is in good agreement with the calorimetric data.

Stimulable phosphors and radiographic image conversion panels

Stimulable phosphors and radiographic image conversion panels. Umemoto, Chuki (Fuji Photo Film Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 61264084 A2 21 Nov 1986 Showa, 11 pp. (Japan) CODEN: JKXXAF. CLASS: ICM: C09K011-61. ICS: G21K004-00. APPLICATION: JP 85-106752 17 May 1985. DOCUMENT TYPE: Patent CA Section: 74 (Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes) Section cross-reference(s): 73 Phosphors of the formula MFX.aNaX1.bLnX32:xEu2+ (M = Ba, Ca, Sr; X, X1 = Cl, Br, I; X2 = F, Cl, Br, I; Ln = Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu; 0 < a ￡ 2; 0 < b ￡ 5 ′ 10-2; 0 < x ￡ 0.2) and radiog. image intensification screens contg. the phosphors as stimulable phosphors are claimed. The phosphors exhibit improved emission characteristics and very low residual emission (i.e. very low emission after the latent images are erased) and hence the phosphors improve the quality of radiog. 13708-63-9 and 13569-80-7 are just another two chemicals used in this study. images. .