Magnetic interactions in gadolinium orthoferrite

It has been shown that the Fe 3+ ions in the distorted perovskite GdFeO 3 become ordered antiferromagnetically at 650 K and the ordering arrangement is G x F z in Bertaut's (1963) notation. The canted moment has been measured at temperatures below 77 K, and has been found to produce an effective field of 310 Oe at the gadolinium sites opposing the canted moment. The induced susceptibility of the Gd 3+ ions in zero applied field is in direct opposition to the resultant Fe moment along the c axis. The specific heat has been measured in the temperature range 0.5 K