Abstract
Detailed X-band EPR studies of the Gd3+ ion have been carried out in a europium ammonium sulphate single crystal between liquid-helium and room temperature. The behaviours of the overall splitting of EPR lines and the EPR linewidth indicate the occurrences of two first-order phase transitions at 273+or-0.5 and 166+or-0.5 K, respectively. The spin-Hamiltonian parameters for Gd3+ at room temperature have been evaluated. The intrinsic parameter b2 for Gd3+ in NH4Eu(SO4)2.4H2O crystal has been calculated by the use of the superposition model of Newman (1975), and found to be -5.802 GHz, with the exponent t2=9.0.
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