Abstract
Small particles (100 A in diameter) of Gd3+-doped SrCl2 have been prepared by evaporating a bulk sample in a low-pressure argon atmosphere. EPR measurements were made at X-band and room temperature. In the case of small particles, the observed ~ d ~ + spectrum exhibits two significant differences relative to the bulk powder spectrum. First, the cubic crystal-field parameter I b4 1 is increased by 1.6 & 0.1 % for the small-particle sample. This effect is interpreted as due to a lattice-parameter contraction of approximately 0.27 % as compared to the bulk material. Second, the line widths of the EPR transitions are consistently larger in the small-particle case. Annealing at 400 C for 1 min. coagulates the small particles and, following this anneal, the parameter b4 and the line widths are equal to those of the bulk material.
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