As-S 系および As-S-Te 系ガラスにおける化学結合種と熱的性質

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Thermal conductivities and specific heats of vitreous materials in the system As-S-Te (composition: 12.7-38.8 at % As, 39.8-87.3 at % S and 0-30.6 at % Te) were measured in the temperature range from 25 to 80℃ by a comparative method and an adiabatic calorimeter. Thermal conductivity at 40℃, λ_40, decreased with increasing Te content introduced into As-S parent glasses. The values of λ_40 of As-S glasses, which have been reported previously, as well as those of As-S-Te glasses increased with covalent bond concentration, [v]. The bond concentration is defined as the total moles of all kinds of covalent bonds in unit volume of the glasses. Comparisonλ_40 for the glasses with same [v]and the same amount of cross-linking indicated that the value for As-S-Te glass was lower than that for As-S glass. The heat capacity at 40℃ per gram formular weight of AsS_xTe_y, C(AsS_xTe_y), can be estimated by the following bond additivity relation, C(AsS_xTe_y)=5.1[A]+5.9[B] where [A] is the total mole of As-S and As-Te bonds and [B] the moles of Te-S, Te-Te and S-S bonds per gram formular weight of AsS_xTe_y. The agreement of the values of heat capacities estimated by the above relation with the observed values for As-S-Te glasses was slightly worse than that in the case of As-S glasses. The present result suggests that the bond contribution by each bond species should be determined to improve the accuracy of the additivity relation.
社団法人日本材料学会の論文
1974-02-15

As-S 系および As-S-Te 系ガラスにおける化学結合種と熱的性質

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