Heat capacity from 5 to 300 K of A- and B-TiO, relative enthalpy to 1200 K, enthalpy of transition, and thermodynamic properties to 1265 K.
The heat capacities of TiO(a) and TiO(b) were measured from 5 to 305 K by adiabatic calorimetry. High-temperature enthalpies up to 1,192 K for TiO(a) were determined by copper-block drop calorimetry. The enthalpy of transition for TiO(a) to TiO(b) was determined by hydrofluoric acid solution calorimetry and by differential scanning calorimetry. The values at 298.15 K of cp/o, [s0(t)-s deg (o)], and -[g deg (t)-h deg (o)]/t are 39.89, 34.26, and 13.75 J.K-1.Mol-1 for TiO(a), 40.40, 35.75, and 14.65 J.K-1.Mol-1 for TiO(b). These thermodynamic functions are also calculated from 5 to 1,265 K for tio(a), and from 5 to 300 K for TiO(b). The enthalpy of transition from a to b at 298.15 K is 4.7Kj.Mol-1 and at 1,265 K is 5.4 Kj.Mol- 1.