The pressure dependence of the néel temperature in FeF2

A Mössbauer measurement of the pressure dependence of the Néel temperature in FeF₂ is reported. Up to the maximum pressure of 50 kbar T_N increases at the rate of 0.27 ± 0.03°K/kbar. When this pressure dependence is converted to volume dependence, the result, d In T_N/d In V = 3.2 ± 0.3, is found to obey the $\text{“10}\text{3}$ rule” established by Bloch for a wide variety of antiferromagnetic insulators.