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The thermodynamic properties ofSrBaFe4O8(s)fromT →  0 toT =  1500 K

✍ Scribed by M.E. Huntelaar; ; E.H.P. Cordfunke; ; G.D. Elzinga; R.R. van der Laan

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
159 KB
Volume
32
Category
Article
ISSN
0021-9614

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✦ Synopsis

The low-temperature adiabatic heat capacity of SrBaFe 4 O 8 (s) has been measured from T = 4 K to T = 420 K, yielding for C o p,m and S o m at T = 298.15 K, the values (288.9±0.3) J • K -1

• mol -1 and (338.0±0.3) J • K -1 • mol -1 , respectively. The enthalpy increment function for the above ambient temperature has been obtained from hightemperature drop calorimetry measurements over the temperature range 525 K to 882 K. In addition, the standard molar enthalpy of formation has been derived from the standard molar enthalpies of solution in (2.65 mol • dm -3 HCl + 1.76 mol • dm -3 HNO 3 )(aq) using an isoperibol solution calorimeter. From these measurements and auxiliary data, the following value has been obtained: f H o m (298.15 K){SrBaFe 4 O 8 (s)} = -(2888.0 ± 5.0) kJ • mol -1 . A table containing the thermodynamic properties at selected temperatures from 298.15 K to 1500 K is given.

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