560069-78-5Relevant articles and documents
Physicochemical properties of the EuBr2-KBr binary system
Rycerz,Ingier-Stocka,Cieslak-Golonka,Wojciechowska,Gadzuric,Gaune-Escard
, p. 157 - 161 (2008)
The phase diagram of the EuBr2-KBr binary system was derived from DSC measurements. It exhibits three eutectics and three stoichiometric compounds. The first compound, K2EuBr4, melts congruently at 834 K. The second one, KEuBr3 undergoes a solid-solid phase transition at 810 K and decomposes peritectically at 846 K. The third compound, KEu2Br5, melts congruently at 880 K. The composition of the three eutectic mixtures, x(EuBr2) = 0.318, 0.433 and 0.789, respectively, were determined by the Tamman method. The respective eutectic temperatures are 829, 811 and 854 K. Diffuse reflectance spectra of the pure components and their solid mixtures confirmed the existence of new phases exhibiting their own spectral characteristics, which may be related to the existence of above mentioned compounds in the system under investigation.
Thermal properties of the aquadimethylsulfoxide complexes [Ln(DMSO)n(H2O)m][Mo3S7Br7] where Ln = Pr, Nd, Eu, Tm
Geras'ko,Fedorov,Logvinenko,Hegetsweiler,Elsegood,Paek
, p. 411 - 420 (2008/10/08)
Synthesis, X-ray structural investigation, and study of the thermal properties of new aquadimethylsulfoxide complexes [Ln(DMSO)n(H2O)m][Mo3S7Br7] containing the rare earth metals (Ln = Pr, Nd, Eu, Tm) were performed. In all complexes DMSO is co-ordinated through the O atoms. Thermal transformations of these salts were studied by quasi-equilibrium thermogravimetry a variant of CRTA (Controlled Rate Thermal Analysis) with constant rate of mass loss (0.3 mg min-1); helium flow keeps the partial pressure of self-generated DMSO/H2O atmosphere approximately 0.01 atm. [Pr(DMSO)6(H2O)]X where X = [Mo3S7Br7] decomposes with the formation of the intermediate phases Pr(DMSO)5X at 100-190 °C and Pr(DMSO)3X at 250-270 °C. Thermal decomposition of [Nd(DMSO)6(H2O)]X·CH3CN leads to the intermediate phase Nd(DMSO)5X at 200-210 °C. [Eu(DMSO)7(H2O)]X forms the intermediate phases Eu(DMSO)6X at 50-150 °C and Eu(DMSO)5X at 190-210 °C. Thermal decomposition of [Tm(DMSO)6(H2O)]X gives the intermediate phases Tm(DMSO)5X at 170-200 °C and Tm(DMSO)4X at 240-250 °C. The further decomposition takes place continuously for all phases.
