Abstract
Systematics of X-band (about 9.50 GHz) EPR measurements in the temperature range 4.2-295 K on single crystals of Gd3+-doped Dy(BrO3)3.9H2O and Eu(BrO3)3.9H2O reveal that the Dy(BrO3)3.9H2O single crystal undergoes two structural phase transitions at 67+or-0.5 and 18+or-0.5 K (the phase transition detected here at 18 K being the first ever reported), while the Eu(BrO3)3.9H2O single crystal undergoes only one structural phase transition at 63+or-0.5 K The Gd3+ EPR spin Hamiltonian parameters at 295 and 77 K have been estimated for the two host crystals. The present Gd3+ EPR results on the heavier R(BrO3)3.9H2O (R=Dy, Eu) crystals are found to be significantly different from those on the lighter R(BrO3)3.9H2O (R=Pr, Nd, Sm) single crystals; a comparison of the features of Gd3+ EPR data in the lighter and heavier compounds has been provided.
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