10138-62-2Relevant articles and documents
Ternary chlorides in the systems ACl/HoCl3 (A = Cs, Rb, K)
Roffe,Seifert
, p. 128 - 133 (1997)
The phase diagrams of the pseudo-binary systems ACl/HoCl3 (A = Cs, Rb, K) were investigated by DTA and XRT. The existence of compounds A3HoCl6, Cs2HoCl5, Cs3Ho2Cl7 and AHo2Cl7 could be confirmed. Additionally, the 2:1-compounds Rb2HoCl5 (Cs2DyCl5-structure) and K2HoCl5(K2PrCl5-structure) were found. By solution enthalpy and e.m.f vs. T measurements in galvanic chlorine cells for solid electrolytes, the thermodynamic functions for the formation from ACl and HoCl3 and for the formation from the compounds adjacent in the phase diagrams were measured. The compounds A3HoCl6 could be prepared also from acetic acid solutions. From aqueous solutions, the ternary halides Cs4HoCl7 and Cs3HoCl6 crystallizing in the space group Pbcm were prepared. Anhydrous HoCl3 can be obtained comfortably from holmium formiate at approximately 300 °C in an HCl gas stream.
Refractive indexes and electronic polarizabilities of molten HoCl3-NaCl and HoCl3-KCl mixtures
Shirao,Iida,Fukushima,Iwadate
, p. 163 - 168 (1998)
The refractive indexes of molten HoCl3-NaCl and HoCl3-KCl mixtures were measured by goniometry using visible light at eight wavelengths and expressed as functions of both temperature and wavelength into empirical formulas by a least-squares method. The electronic polarizabilities of ions in the mixture melts were obtained from the data of refractive indexes and molar volumes, and the polarizability of a Ho3+ ion was evaluated to be about 0.98 × 10-30 m3 according to the Clausius-Mossotti equation. The isotherms of these properties show little deviation from their additivity line.
Synthesis, characterization and thermal behaviour of solid-state tartrates of heavy trivalent lanthanides and yttrium(III)
Ambrozini, B.,Dametto, P. R.,Ionashiro, M.
, p. 867 - 871 (2011/10/31)
Solid state Ln2-L3 compounds, where Ln stands for heavy trivalent lanthanides (terbium to lutetium) and yttrium, and L is tartrate [(C4H4O6)-2] have been synthesized. Simultaneous thermogra
Structural characterization of methanol substituted lanthanum halides
Boyle, Timothy J.,Ottley, Leigh Anna M.,Alam, Todd M.,Rodriguez, Mark A.,Yang, Pin,Mcintyre, Sarah K.
, p. 1784 - 1795 (2010/07/03)
The first study into the alcohol solvation of lanthanum halide [LaX3] derivatives as a means to lower the processing temperature for the production of the LaBr3 scintillators was undertaken using methanol (MeOH). Initially the de-hydration of {[La(μ-Br)(H2O)7](Br)2}2 (1) was investigated through the simple room temperature dissolution of 1 in MeOH. The mixed solvate monomeric [La(H2O)7(MeOH)2](Br)3 (2) compound was isolated where the La metal center retains its original 9-coordination through the binding of two additional MeOH solvents but necessitates the transfer of the innersphere Br to the outersphere. In an attempt to in situ dry the reaction mixture of 1 in MeOH over CaH2, crystals of [Ca(MeOH)6](Br)2 (3) were isolated. Compound 1 dissolved in MeOH at reflux temperatures led to the isolation of an unusual arrangement identified as the salt derivative {[LaBr2.75·5.25(MeOH)]+0.25 [LaBr3.25·4.75(MeOH)]-0.25} (4). The fully substituted species was ultimately isolated through the dissolution of dried LaBr3 in MeOH forming the 8-coordinated [LaBr3(MeOH)5] (5) complex. It was determined that the concentration of the crystallization solution directed the structure isolated (4 concentrated; 5 dilute) The other LaX3 derivatives were isolated as [(MeOH)4(Cl)2La(μ-Cl)]2 (6) and [La(MeOH)9](I)3·MeOH (7). Beryllium Dome XRD analysis indicated that the bulk material for 5 appear to have multiple solvated species, 6 is consistent with the single crystal, and 7 was too broad to elucidate structural aspects. Multinuclear NMR (139La) indicated that these compounds do not retain their structure in MeOD. TGA/DTA data revealed that the de-solvation temperatures of the MeOH derivatives 4-6 were slightly higher in comparison to their hydrated counterparts.
