Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10637167 | Solid State Sciences | 2005 | 5 Pages |
Abstract
EPR and FT-IR absorption measurements performed on xMnOâ
(100âx)[B2O3â
Bi2O3] glasses with 0⩽x⩽50 mol% are reported. The EPR spectra of all investigated samples exhibit resonance signals that are characteristic for the Mn2+ ions. For x⩽20 mol% the spectra consists of two resonance lines centered at geffâ
4.3 and geffâ
2.0, their relative intensity depending on the manganese content of the sample. For x⩽3 mol%, the line from geffâ
4.3 has a resolved hyperfine structure characteristic for isolated Mn2+ ions disposed in distorted sites of an octahedral symmetry. The resonance line centered at geffâ
2.0 has not hyperfine structure and is attributed to coupled Mn2+ ions by dipolar (x⩽5 mol%) or/and superexchange interactions (x>5 mol%).The FT-IR data indicate the presence in the glasses of the BO3, BO4, BiO6 and BiO3 units and its dependence on the MnO content.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
I. Ardelean, Simona Cora, Raluca Ciceo Lucacel, Octavia Hulpus,