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Energetics of Spinels in the FeTiO System at the Nanoscale
Author(s) -
Lilova Kristina I.,
Pearce Carolyn I.,
Rosso Kevin M.,
Navrotsky Alexandra
Publication year - 2014
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201402441
Subject(s) - spinel , hematite , rutile , solid solution , materials science , thermodynamics , mixing (physics) , calorimetry , particle size , oxide , entropy of mixing , chemical engineering , enthalpy , chemistry , metallurgy , physics , quantum mechanics , engineering
The energetics of nanosized Fe/Ti spinel oxides was studied using high‐temperature oxide melt solution calorimetry. The mixing properties of the solid solution in the system were obtained, and through comparison to macroscopic materials the effect of particle size on the thermodynamics was assessed. The surface energies of the nanosized materials are similar within the errors regardless of the composition, and are consistent with those determined for other spinels. The enthalpies of oxidation to hematite plus rutile of the iron titanium spinels follow a linear trend with the Fe 2+ content, which allows them to be calculated for any composition or particle size. The heat of formation of the macroscopic and nanosized titanomagnetites was fit as a polynomial function and the numerical coefficients are presented. The enthalpies of mixing in the titanomagnetite and titanomaghemite solid solutions are similar at the macroscopic and nanoscale.