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Thermodynamic properties of iron silicides FeSi andα-FeSi2

✍ Scribed by J. Acker; K. Bohmhammel; G.J.K. van den Berg; J.C. van Miltenburg; Ch. Kloc

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
245 KB
Volume
31
Category
Article
ISSN
0021-9614

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✦ Synopsis

The molar heat capacities of FeSi and α-FeSi 2 have been determined by low-temperature adiabatic calorimetry at temperatures between T = 11 K and T = 400 K. From the heat capacity data the derived thermodynamic functions; standard molar enthalpy T 0 H o m , standard molar entropy T 0 S o m , and Gibbs energy function o m def = T 0 S o m -T 0 H o m /T were calculated. Standard molar entropies of (45.57 ± 0.50) J • K -1

• mol -1 and (68.31 ± 0.71) J • K • mol -1 at T = 298.15 K for FeSi and α-FeSi 2 , respectively, have been found. In an optimization procedure, the standard molar enthalpies of formation f H o m were calculated using our measured data and data calculated from (iron + silicon) melts. The values obtained are: for FeSi, f H o m (298.15 K) = -73.89 kJ • mol -1 and for α-FeSi 2 , f H o m (298.15 K) = -78.62 kJ • mol -1 .

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