Abstract
The linewidth of electron spin resonance (ESR) absorption in polycrystalline samples of chromium-doped alumina (Al2O3: Cr3+) has been investigated as a function of chromium concentration and particle size. The linewidth is found to be directly proportional to chromium concentration and inversely proportional to particle size. The experimental results are consistent with the mechanism of dipolar broadening in diluted solid solutions; the influence of particle size may be attributed to size-dependent fluctuations of the zero-field parameter, D.
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