Abstract
The low-temperature adiabatic heat capacity of SrBaFe4O8(s) has been measured fromT= 4 K to T= 420 K, yielding for Cop,m and Som 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 high-temperature 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 HNO3)(aq) using an isoperibol solution calorimeter. From these measurements and auxiliary data, the following value has been obtained:ΔfHom (298.15 K){ SrBaFe4O8(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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