EPR of Mn2+, Fe3+, and Cu2+ in glasses of the systems BaO–B2O3–Al2O3 and CaO–B2O3–Al2O3

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Abstract
An electron paramagnetic resonance study was made of Mn2+, Fe3+, and Cu2+doped into the glass systems BaO–B2O3–Al2O3 and CaO–B2O3–Al2O3. The spectra of the manganesedoped samples exhibited a barely resolved Mn2+ hyperfine pattern at g=2 and in some cases low field lines at g∼3 and g∼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 (D term) splitting. The 0.1% Mn samples produced better resolved hyperfine patterns than the 1% samples. The spectra of iron and copperdoped glasses were also strongly concentration dependent. The results are discussed in terms of the glassy regions of the phase diagram.