| Abstrakt: |
Based on the experimentally measured data of density (determined by the Archimedean method) of the systems (LiF (1) + NaF (2))eut+ xLnF3(3) (LnF3= SmF3, GdF3, and NdF3; x= 0.0000–0.2500), molar volumes and partial molar volumes were calculated. Molar volumes of all three systems increase with increasing LnF3concentration without any local extremes. The partial molar volumes of LnF3were obtained by using two different approaches─simple polynomial regression analysis and multicomponent polynomial regression in the form of the Redlich–Kister equation. Values of the partial molar volumes of LnF3in (LiF + NaF)eutat infinite dilution are positive and as high as V¯m,NdF3°,1073K=37.61cm3·mol−1, V¯m,SmF3°,1073K=30.55cm3·mol−1, and V¯m,GdF3°,1073K=22.19cm3·mol−1, all of them indicating volume expansion in the investigated systems. This volume expansion decreases with increasing proton number of investigated LnF3and is generally higher at lower temperatures. |
