Crystal structure and thermodynamic properties of dipotassium diiron(III) hexatitanium oxide |
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Authors: | A V Knyazev N G Chernorukov I A Letyanina Yu A Zakharova I V Ladenkov |
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Institution: | 1. Nizhny Novgorod State University, Gagarin Prospekt 23/2, 603950, Nizhny Novgorod, Russia
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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) Å, c = 2.97567(4) Å, V = 305.618(7) Å3. The high-temperature X-ray diffraction was used for the determination of coefficients of thermal expansion. |
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