Low temperature heat capacity study of FePO4 and Fe3(P2O7)2

► We report for the first time heat capacity measurements on FePO4 and Fe3(P2O7)2. ► Magnetic transitions occur at 25 K and 50 K for FePO4 and Fe3(P2O7)2. ► A Schottky anomaly also occurs below 10 K for Fe3(P2O7)2.