Abstract
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 \( C_{p}^{ \circ } (T) \), enthalpy \( H^{ \circ } (T) - H^{ \circ } (0) \), entropy \( S^{ \circ } (T) - S^{ \circ } (0), \) and Gibbs function \( G^{ \circ } (T) - H^{ \circ } (0) \) for the range from T → 0 to 300 K. The structure of K2Fe2Ti6O16 is refined by the Rietveld method: space group I4/m, Z = 1, a = 10.1344(2) A, c = 2.97567(4) A, V = 305.618(7) A3. The high-temperature X-ray diffraction was used for the determination of coefficients of thermal expansion.
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