Standard molar enthalpies of formation at the temperature 298.15 K of iron telluride (FeTe0.9) and of nickel telluride (Ni0.595Te0.405)

Thermodynamic assessment of the Ni–Te system

“…Heat capacity has been measured on the b2 and d phases by several authors in a cryostat [27], via adiabatic shield calorimetry (AShC) [28,29], differential scanning calorimetry (DSC) [30] and adiabatic scanning calorimetry (AScC) [31]; they are all consistent, and the b2 phase measurements show several lambda-type transitions. Enthalpy of formation has only been measured by solution calorimetry on the b2 phase by Shukla et al [32], and supposedly on d by Predel and Ruge [33], although their composition corresponds to c1 þ d. Jandl et al [34] evaluated 0 K formation enthalpies of the d phase by DFT calculations. Activity data have been collected on most phases of the system via isopiestic measurements [14], Knudsen effusion mass spectrometry (KEMS) [35,36] and electromotive force (EMF) [21,[37][38][39].…”

“…The a-and b-terms of the interaction parameters together with the b-term of b2 À Ni 2 Te could then be optimized to fit activity data [35,39] and the congruent reaction b2 b1. The aterms of the end-members were optimized to fit a sort of compromise between the enthalpy of formation of the end-members evaluated via DFT in this work and the calorimetric point by Shukla et al [32]. If the latter enthalpy of formation were to be fit well, the phase would be too stable to allow the proper shape of the d phase.…”

Thermodynamic assessment of the Fe-Te system. Part II: Thermodynamic modeling

“…6) of the -and -end-members were fitted to the available data [10,11]. The parameters for the phase were then fitted to enthalpy of formation by Shukla et al [8] and theend-member formation energy evaluated in this work. The parameter of the phase was fitted to derived formation enthalpy data [1].…”

“…Chemical potential and thermodynamic activity data have been evaluated via Electromotive Force (EMF) measurements [1], Knudsen effusion with mass-spectrometry and mass-loss techniques [2][3][4], torsion effusion [5] and isopiestic experiments [6]. Enthalpy measurements have been performed in the and + regions [7][8][9]. Heat capacities have been measured on the and phases [10][11][12].…”

“…Mass-Spectr. 866-999 <46 [4] The formation enthalpy of phase calculated by Wagman et al [14] from the measurements by Fabre [7] is unreasonably low ( ), many times lower than that of Shukla et al ( ) [8], and is probably incorrect. The excess enthalpy of solution for infinite dilution if Fe in Te by Maekawa and Yokokawa [13] was comparatively low, but the briefness of their paper makes it difficult to evaluate.…”