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Abstract  

A model of an ideal associated solution, containing self-associates of different sizes and shapes, was considered. Calculations of the thermodynamic properties of mixing of Na-K liquid alloys and of liquidus line positions were carried out. Possible modifications of the model are discussed.

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Abstract  

The subject of the present study is the system SeO2-Bi2O3 that comprises two oxides with low melting points. All batches are thermal treatment in quartz ampoules, which are evacuated and sealed at a pressure P=0.1 Pa. On the basis of DTA (differential thermal analysis) and X-ray data, the most probable liquidus line of the system has been plotted. The eutectic composition lies about 90 mol% SeO2,with on eutectic temperature at 230C. Above 20 mol% Bi2O3 the liquidus temperature extremely increases. The formation of three compounds is proved:Bi2Se3O9 and Bi2Se4O11 are melting incongruently at 540 and 350C respectively and Bi2SeO5 congruently at 915C.

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Na-Gd phosphate glasses

Preparation, thermal and scintillating properties

Journal of Thermal Analysis and Calorimetry
Authors: K. Nitsch, A. Cihlář, D. Klimm, M. Nikl, and M. Rodová

Summary The present paper deals with preparation, thermal properties and radioluminescence of Ce-doped Na-Gd phosphate glasses. Thanks to their high radioluminescence intensity, three times greater than that of BGO, these glasses are promising materials for the detection of neutrons, ?- and X-rays. The glasses with a Gd concentration up to 89 mol% were prepared by a rapid quenching technique in air. Their thermal properties were determined using DSC and temperatures of glass transition were measured in addition using TMA. Temperatures of glass transition, crystallization and melting depend on Gd concentration and they follow the liquidus line in a phase diagram of binary system in which two eutectics and a congruently melting compound exist. High glass-forming ability of this glass system was found evidenced. The glasses containing at least 30 mol% Gd were moisture resistant.

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weight fraction of the minor component, R universal gas constant, molar heat of fusion of the major component and T mix is the temperature along the liquidus line as a function of w p . On the basis of the above equation, Law et al. [ 5

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Journal of Thermal Analysis and Calorimetry
Authors: Bedřich Smetana, Simona Zlá, Aleš Kroupa, Monika Žaludová, Jaromír Drápala, Rostislav Burkovič, and Daniel Petlák

). Comparison with theoretical calculations is shown in Fig. 8 . End of melting ( T L ) was observed above liquidus line of the isopleth (2 wt% of Al), slightly for A9 and about 39 °C for A8. Temperatures T E1 , T 5 and T 2 agree well with calculated lines

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