Beschreibung:
<jats:p>Cobalt ferrite (CoFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>) has been synthesized by a solid-state mechanothermal process, and its molar heat capacity has been determined. A stoichiometric mixture of CoC<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> ・ 2H<jats:sub>2</jats:sub>O and FeC<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> ・ 2H<jats:sub>2</jats:sub>O was subjected to a combination of mechanical activation (by high-energy milling) and thermal activation (by annealing at temperatures between 300 and 700 °C). The process was followed by thermogravimetric analysis and high-temperature X-ray powder diffraction. It has been shown that CoFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> forms at all temperatures, though with different degrees of crystallization, while Co<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> and Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> are the only products formed when starting from unmilled mixtures. The molar heat capacity of CoFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> has been determined in the temperature range 60 - 400 °C by MTDSC. It has been shown that the molar CP values of CoFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> samples produced at T ≥ 500 °C are close to each other while those of the samples produced at 300 and 400 °C are lower. Furthermore the CoFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> samples prepared at T ≥ 500 °C show very similar microstructures.</jats:p>