An electron paramagnetic resonance study was made of Mn2+, Fe3+, and Cu2+doped into the glass systems BaOndash;B2O3ndash;Al2O3and CaOndash;B2O3ndash;Al2O3. The spectra of the manganese doped samples exhibited a barely resolved Mn2+hyperfine pattern atg=2 and in some cases low field lines atgsim;3 andgsim;5. The concentration dependence of these low field lines is interpreted in terms of the lattice distortion produced by the very large barium and calcium ions and the resulting large zero field (Dterm) splitting. The 0.1percnt; Mn samples produced better resolved hyperfine patterns than the 1percnt; samples. The spectra of iron and copper doped glasses were also strongly concentration dependent. The results are discussed in terms of the glassy regions of the phase diagram.
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