Crystal structure and thermodynamic properties of dipotassium diiron(III) hexatitanium oxide

In the present work, the temperature dependence of heat capacity of dipotassium diiron(III) hexatitanium oxide has been measured for the first time in the range from 10 to 300 K by means of precision adiabatic vacuum calorimetry. The experimental data were used to calculate standard thermodynamic functions, namely the heat capacity , enthalpy , entropy and Gibbs function for the range from T → 0 to 300 K. The structure of K 2 Fe 2 Ti 6 O 16 is refined by the Rietveld method: space group I 4/ m , Z = 1, a = 10.1344(2) Å, c = 2.97567(4) Å, V = 305.618(7) Å 3 . The high-temperature X-ray diffraction was used for the determination of coefficients of thermal expansion.