Abstract
Phase equilibria in the EuBr2–CsBr binary system were investigated by the differential scanning calorimetry method. The mixing enthalpy of the liquid phase at 1055 K was measured using a Calvet calorimeter over the whole composition range. Two compounds, CsEuBr3, congruently melted at 1034 K, and CsEu3Br7, decomposed at 704 K, were found in the solid phase. Two eutectics were located at xEuBr2 = 0.197 (T = 812 K) and xEuBr2 = 0.821 (T = 864 K). The heat capacities of solid and liquid phases of CsEuBr3 were measured from 300 to 1100 K. The CALPHAD method was used to verify the thermodynamic phase compatibility of the system. The Gibbs free energy of formation of solid compounds was calculated.
Highlights
Phase equilibria in the EuBr2−CsBr binary system were investigated by the differential scanning calorimetry method
Two eutectics were located at xEuBr2 = 0.197 (T = 812 K)
The heat capacity of CsEuBr3 compound was measured with the same Setaram differential scanning calorimetry (DSC) 121 by a so-called step method described in detail previously.[8,9]
Summary
“The photoluminescence properties of divalent lanthanides have attracted a lot of attention both from theoretical and applicational perspectives due to the parity-allowed character of the 5d−4f transitions they exhibit in the UV and visible range. “Compositions based on CsBr:Eu2+ are considered as the perspective storage X-ray phosphors for visualization of the Xray images or luminophore plate production”.2,3. These phosphors can be produced by a vacuum evaporation method,[4] in which the mixture of CsBr and EuBr2 is used as the phosphor raw material.. 7787-69-1 a Content of bromine and europium determined by mercurimetric and complexometric methods, respectively. K. Chemical analysis of obtained EuBr2 performed by mercurimetric (bromine) and complexometric (europium) methods confirmed its good quality (Eu, 48.74% found, 48.75% calcd; Br, 51.26% found, 51.25% calcd). Mixtures of EuBr2 and CsBr (in appropriate proportions) were melted in vacuum-sealed quartz ampoules, homogenized, and solidified. 3−4 g of each mixture was prepared in order to avoid deviation from stoichiometry
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