Abstract
The zero-phonon R-line luminescence spectra of 3d3ions (Cr3+and Mn4+) in a series of Y3Al5–5yGa5yO12(0 ≤y≤1) solid solution garnet ceramics were studied. Instead of increased inhomogeneous line broadening which is usually observed in solid solutions, discrete structure in the Cr3+emission spectra is observed at lower values of y, whereas at high
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