Enthalpy of lanthanum germanides at 300-2012 K

Melting enthalpies and heat capacities of lower germanides of rare-earth metals

“…We measured the enthalpies of six R 5 Ge 3 germanides (R = La, Pr, Gd, Dy, Ho, Lu) with a mixing method [5][6][7][8][9][10]. Experimental data on the enthalpies from room to melting temperatures were fitted by the Meier-Kelly equation:…”

“…1. Variation in melting temperatures (a) and enthalpies (b) in the series of REM germanides of R 5 Ge 3 type: 1) data from [5][6][7][8][9][10] and 2) from [3] where C ph is the phonon contribution in harmonic approximation, C a is the anharmonic contribution, C e is the electron contribution, and C f is the Schottky contribution.…”

“…(1) [5][6][7][8][9][10]. The monotonic increase in the heat capacity of these compounds up to melting temperatures permits representing their isobaric heat capacity as the sum of the major contributions: Fig.…”

Quantitative differential thermal analysis of polymorphic transformations in LaGe1.8 and SmSi2

“…According to La-Ge and Sm-Si phase diagrams [14,15], the temperature of LaGe 2-a polymorphic transformation within the homogeneity region changes from 693 to 728 K and is 653 K for SmSi 2 . The papers [12,13] report on temperatures, enthalpies, and entropies of LaGe 1. 8 …”

“…The production technique, evaluation, and thermodynamic characteristics of the specimens are described in [11][12][13]. This study used a quantitative DTA, as described above, to determine energy characteristics of reverse polymorphic transformations of these compounds.…”