Standard Entropy of Formation of SnMg₂ at 298 K

Abstract

Thermodynamic functions E 3000 Standard Entropy of Formation of SnMg 2 at 298 K -[-14.24 J/mol·K]. -(MORISHITA*, M.; KOYAMA, K.; J. Alloys Compd. 398 (2005) 1-2, 12-15; Dep. Mater. Sci. Chem., Univ. Hyogo, Himeji, Hyogo 671, Japan; Eng.) -Schramke 38-020

Standard entropy of formation of SnMg2 at 298K

“…The obtained values of γ and A for Sn 0.333 Mg 0.667 are compared in Table 3 with those of Mg 0.48 Zn 0.52 [7], Mg 0.4 Zn 0.6 [8], Mg 0.333 Zn 0.667 [9] and Mg 0.154 Zn 0.846 [9]. Previously, the values of γ and A of pure copper were measured in order to evaluate the accuracy achieved with the applied measurement set up [7].…”

“…Previously, C p of pure copper was measured and the corresponding S o 298 was calculated in order to evaluate the accuracy achieved with the applied measurement arrangement [7][8][9][10][11]. The measured C p data and the calculated S o 298 data deviate only less than 1%, compared with the reference data [19].…”

“…The heat capacities for Sn 0.333 Mg 0.667 were measured in the temperature range 2-300 K by using a relaxation method [12][13][14] instrument (Quantum Design, San Diego, USA) in the same way as in our previous study [7][8][9][10][11]. The heat capacities for Sn 0.333 Mg 0.667 were negligibly small below 2 K. Therefore, S o 298 can be approximately determined from C p values measured from 2 K. The masses of samples were ∼30 mg. Six series measurements were carried out.…”

“…Ogawa et al [ [9], and Zn 13 La [10], and the oxide NiMoO 4 [11] were precisely determined by measuring C p from near absolute zero (2 K) to 300 K by the recently developed method of relaxation calorimetry [12][13][14]. In the present study, ∆ f S o 298 of SnMg 2 was determined in the same way as in our previous studies [7][8][9][10][11]. Also, in order to study the carrier electron content in SnMg 2 , the coefficients of the electronic term, γ, contributing to the heat capacity and electric resistivity, ρ, were measured.…”

On the scaling factor in Debye–Grüneisen model: A case study of the Mg–Zn binary system

“…While Chen and Sundman [1] and Lu et al [7,12] have studied various classes of crystals, a systematic study of the scaling factor for one binary system has not be accomplished. The Mg-Zn system is chosen as a case study because it contains a multitude of stoichiometric intermetallics that have been studied extensively using experiments [13][14][15][16][17][18][19]. Mg-Zn intermetallics also have very different crystallography including monoclinic, hexagonal Laves, and cubic phases.…”