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

Autor: I. A. Letyanina, I. V. Ladenkov, N. G. Chernorukov, Yu. A. Zakharova, Alexander V. Knyazev
Rok vydání: 2012
Předmět:
Zdroj: Journal of Thermal Analysis and Calorimetry. 112:991-996
ISSN: 1572-8943
1388-6150
DOI: 10.1007/s10973-012-2606-x
Popis: 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.
Databáze: OpenAIRE
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