Physicochemical properties of the EuBr2–KBr binary system
摘要:
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 inixtures 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. (c) 2006 Elsevier B.V. All rights reserved.
Addition compounds between lanthanide bromides and N,N-dimethylacetamide
作者:G. Vicentini、C. Airoldi
DOI:10.1016/0022-1902(71)80610-3
日期:1971.6
hydrated lanthanide bromides and N,N-dimethylacetamide (DMA) was studied. Compounds of general formula LnBr3·5DMA (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, and Dy) and LnBr3·5DMA·3H2O (Ln = Ho, Er, Tm, Yb, Lu, and Y) were obtained. The i.r. spectra, the molar conductance of the compounds in DMA and nitromethane have been determined. A study considering the existence of cationic species in DMA solutions
A study of the thermal decomposition of hydrated europium(III) chloride and europrium(III) bromide
作者:Samuel J. Lyle、William A. Westall
DOI:10.1016/0040-6031(83)80379-7
日期:1983.9
defined in the chloride than in the bromide system, up to 350° and 390°C, respectively, above which temperatures the corresponding oxide halide is the only major product. At least part (about 30%) of the europium undergoes a valence change to europium(II) in the bromide system but not in the chloridesystem in the course of removal of water which occurs by dehydration and hydrolytic processes. The
摘要 研究了EuCl 3 ·6 H 2 O 和EuBr 3 · 6 H 2 O 在室温至900°C 温度范围内的热分解。所使用的技术是由化学分析、穆斯堡尔光谱、质谱和红外分光光度法支持的热重分析,适用于中间分解产物。当在缓慢的氮气流中加热时,水会分阶段流失,这在氯化物系统中比在溴化物系统中更明确,分别高达 350°C 和 390°C,高于此温度,相应的氧化物卤化物是唯一主要的产品。在通过脱水和水解过程除去水的过程中,至少部分(约 30%)铕在溴化物系统中发生化合价变化为铕(II),而在氯化物系统中则没有。因此,溴化物系统介于相应的氯化物和碘化物系统之间,因为后者似乎完全或接近完全转化为铕 (II)。氧化物氯化物和氧化物溴化物分别在 900 和 910°C 下转化为氧化铕 (III)。
Synthesis and kinetics of thermal decomposition of complexes of rare earth bromides with glycine
Abstract Complexes of rareearth bromides with glycine, REBr 3 ·3Gly·3H 2 O (RE is Ce, Pr, Sm, Eu, Gd, Tb, Dy and Y; Gly is glycine) have been synthesized and characterized by means of chemical analysis, elemental analysis, molar conductivity, thermogravimetry, IR spectra and X-ray diffractometry. The IR spectra of the above complexes indicate that in the complexesglycine is coordinated to rare earth
摘要 合成了稀土溴化物与甘氨酸的配合物REBr 3 ·3Gly·3H 2 O(RE为Ce、Pr、Sm、Eu、Gd、Tb、Dy和Y;Gly为甘氨酸)并通过化学分析表征。 、元素分析、摩尔电导率、热重、红外光谱和 X 射线衍射。上述配合物的红外光谱表明,在配合物中甘氨酸通过羧基的氧与稀土阳离子配位。通过TG和DTG技术研究了这些配合物从环境温度到1000°C的热分解过程。通过TG技术在非等温条件下研究了这些配合物的热分解动力学。动力学参数(活化能 E 和指前因子,
Babushkina, T. A.; Bolga, O. A.; Vaisbein, Zh. Yu., Zhurnal Neorganicheskoi Khimii, 1984, vol. 29, p. 1424 - 1426
作者:Babushkina, T. A.、Bolga, O. A.、Vaisbein, Zh. Yu.、Gerbeleu, N. V.、Zolin, V. F.、et al.