13760-79-7Relevant articles and documents
VAPORIZATION REACTIONS IN THE THULIUM - FLUORINE SYSTEM.
Biefeld,Eick
, p. 117 - 123 (1976)
The vaporization and sublimation reactions for the thulium - fluorine system were investigated by mass-loss, X-ray powder diffraction and elemental analysis techniques. Thulium trifluoride was reduced only partially by elemental thulium; a reduced stoichiometric fluoride could not be isolated. Partially reduced TmF//3 decomposes upon heating to a metal-rich vapor and a trifluoride-enriched residue. By a target collection Knudsen effusion method, equilibrium vapor pressures were determined for the reaction TmF//3 (s,l) equals TmF//3 (g). The derived thermodynamic values are compared with those of other lanthanide fluoride systems.
Synthesis and optical properties of non-stoichiometric lanthanide (Sm, Eu, Tm, Yb) fluorides
Ivanenko,Kompanichenko,Omelchuk,Zinchenko,Timukhin
, p. 841 - 847 (2010)
Nonstoichiometric samarium, europium, ytterbium, and thulium fluorides were prepared by reduction of the corresponding trifluorides with the same lanthanide metal or silicon. Crystal lattice type and lattice parameters of the compounds were determined by
Crystal chemical study of the high-temperature phase R(O,F)1.93±δ with R = Tm, Yb and Lu. Professor Dr. Georg Brauer on the occasion of his 90th birthday
Mueller,Petzel,Hormann,Greis
, p. 165 - 168 (1998)
The crystal chemistry of the non-stoichiometric compounds R(O,F)x with R = Tm, Yb, and Lu with x≈1.93±0.02, which are formed by peritectoid reaction of R2O3 with RF3 at ca. 900 K, ca. 950 K and 1076 K, respectively, has been studied by X-ray powder diffraction (Guinier method). Samples of the common composition R(O,F)1.93, which were obtained by quenching from 1375±15 K to room temperature, displayed diffraction patterns of a rather complex superstructure based on the fluorite-related parent structure. The corresponding body-centered basis structure with Z = 2 was found to be orthorhombic with the following lattice parameters: R a(angstroms) b(angstroms) c(angstroms), Tm 3.7508(2) 5.3772(3) 3.8210(2), Yb 3.7341 (2) 5.3609(4) 3.8129(3), Lu 3.7008(2) 5.3371 (4)3.8170(2). This type of compound could not be found in the system Er-O-F. It is therefore concluded that its existence is restricted to the systems with R = Tm, Yb, Lu and Sc, which are characterized by the occurrence of the monoclinic, baddeleyite-type modification of stoichiometric ROF. It could be shown that for the Tm-O-F system the parent structure formula volumes of the orthorhombic vernier phase Tm(O,F)2.11, cubic α-TmOF and orthorhombic Tm(O,F)1.93 depend approximately linearly on composition. The question, whether monoclinic baddeleyite-related TmOF, which has been described in the literature, exists as a thermodynamically stable compound, is tentatively discussed.
Optically active uniform potassium and lithium rare earth fluoride nanocrystals derived from metal trifluroacetate precursors
Du, Ya-Ping,Zhang, Ya-Wen,Sun, Ling-Dong,Yan, Chun-Hua
, p. 8574 - 8581 (2011/01/06)
This paper reports the first systematical synthesis of near-monodisperse potassium and lithium rare earth (RE) fluoride (K(Li)REF4) nanocrystals with diverse shapes (cubic KLaF4 and KCeF4 wormlike nanowires, nanocubes and
