Heat Capacity of Manganese Titanate from 30° to 300°K

The heat capacity of antiferromagnetic manganese titanate was measured between 31° and 300°K. The magnetic heat capacity of MnTiO₃ was determined by subtracting the lattice heat capacity from the observed heat capacity. The lattice heat capacity of MnTiO₃ may be represented by a sum of Debye and Einstein functions. The characteristic temperatures of MnTiO₃ were estimated from the characteristic temperatures of isomorphous diamagnetic compounds. The entropy associated with the antiferromagnetic transition was calculated to be 3.51 cal deg⁻¹, which is in good agreement with $R\ln 6$ . Only 55% of the magnetic entropy is acquired by the Néel temperature at 62.3°K. The thermodynamic functions $C_p{\mathrm{,\; S°\; (H°\hspace{0.17em}-\hspace{0.17em}H}}_0\mathrm{°)\hspace{0.17em}/\hspace{0.17em}T}$ , and ${\mathrm{-(F°\hspace{0.17em}-\hspace{0.17em}H}}_0\mathrm{°)\hspace{0.17em}/\hspace{0.17em}T}$ of MnTiO₃ in cal deg⁻¹·mole⁻¹ at 298.15°K are: 23.93, 25.08, 13.38, and 11.70.