  Erbium orthochromite, ErCrO3, is a distorted-perovskite which has
antiferromagnetic ground state below 10 K while Cr3+ magnetic moments order at
133 K. The temperature dependence of magnetization is studied across different
magnetic phases for ErCrO3 and different magnetization isotherms are analyzed.
In the presence of external magnetic field, polycrystalline ErCrO3 develops
weak ferromagnetism from antiferromagnetic ground state. These magnetic phase
transitions are observed to be of first order which is justified by thermal
hysteresis and Arrott-plots.
