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Representation T-V-x des systemes binaires a tension de vapeur non negligeable

III. — Etude expérimentale par ATD du système NdAs-As

Journal of Thermal Analysis and Calorimetry
Authors: J. C. Rouland, C. Souleau, and R. Ceolin

The effect of the variableV/m on the appearance of DTA endotherms has been used to obtain quantitative data on theT-V-x representation of the NdAs-As system.

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Journal of Thermal Analysis and Calorimetry
Authors: J. Rouland, C. Souleau, and R. Céolin
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RepresentationT-V-x des systemes binaires a tension de vapeur non negligeable

II.-Influence du volume massique sur les courbes d'ATD lors de l'étude du système NdAs-As

Journal of Thermal Analysis and Calorimetry
Authors: J. Rouland, C. Souleau, and R. Ceolin
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Congruent melting of binary compounds with non-negligible vapour pressure

II. Application to the sulfaguanidine—water system

Journal of Thermal Analysis and Calorimetry
Authors: J. Rouland, S. Makki, J. Fournival, and R. Céolin

Abstract  

The sulfaguanidine—water (SG-H2O) system is a binary system with non-negligible vapour pressure which presents a monohydrate. The phase diagram of this system is drawn from DTA experimental results, using the temperature-specific volume-molar fraction (T-v-x) model which was described in part I of this work. The melting of the monohydrate (SG, H2O) is found to be congruent. Isochoric sections are drawn; they make it possible to determine the limits of the two eutectic invariant planes. The composition and specific volume of the vapour phase at the eutectic equilibrium of theSG-SG, H2O subsystem are given. The triple line solid-liquid-vapour of the one-component phase diagram of the monohydrate is drawn. The experimental results are consistent with the congruent melting of the monohydrate. These results also show that the solid, liquid and vapour phase at the triple line have not the same composition.

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