EPR spectroscopic determination and interpretation of g∥ of Gd3+ in single crystals of the lanthanide ethyl sulfate nonahydrates

Abstract

High-precision measured values of g∥ for Gd3+ dilutely substituted in single crystals of 13 lanthanide ethyl sulfate nonahydrates at room temperature (297.3 K) are presented. It is shown that, within the experimental uncertainties, the present observations are entirely accounted for in terms of a model invoking purely magnetic dipolar interactions between the Gd3+ guests and the host structures. On this model, the shift of g∥ depends upon the identity of the lanthanide host, the sample shape, the temperature, and the Gd3+ composition. Moreover, values of the shifts of g∥ at 77.2 K predicted by this model are in agreement, within the experimental uncertainties, with the 77.2 K data of Gerkin and Thorsell [J. Chem. Phys. 57, 2665 (1972)]. Consistent with this model, values of g∥ for spherical samples of 2.0×10−3 mole fraction Gd3+ in 14 of the lanthanide ethyl sulfate nonahydrates at 297.3 K and at 77.2 K are presented.

Host‐Lattice Effects in the EPR Spectra of Gd3+ Doped Hydrated Single Crystals of Rare‐Earth Chlorides, Nitrates, and Sulphates

“…), by (= 60Q), and br (= 1260Br) are used. I n (1) an anisotropic g-tensor (911 = gzz, 91 = gzz = gm) has been chosen in accordance with the discussions presented by Gerkin and Rogers [7] and by Smith et al [5] for Gd3+ ion doping hydrated rare-earth ethyl-sulfate single crystals. The z,y,z axes coincide with the principal axes of the b?…”