Abstract
Manganese-doped magnesium titanate ceramic samples obtained by a solid-state reaction via sintering in the air from a mixture of MgO and TiO2 powders of different molar ratios were analyzed by electron paramagnetic resonance (EPR) technique. The EPR signals of Mn2+ ions (S = 5/2, І = 5/2) in crystal phases of MgO, Mg2TiO4, and MgTiO3 were detected. We have obtained the following spin Hamiltonian parameters for Mn2+ ions: g = 2.0015, A ∼81.0 × 10−4 cm−1 (in MgO phase); g = 2.0029, A ∼73.8 × 10−4 cm−1
, b
2
0 = 35 × 10−4 cm−1 (in Mg2TiO4 phase); g = 2.0040, A ∼79.0 × 10−4 cm−1
, b
2
0 = 165 × 10−4 cm−1 (in MgTiO3 phase). Despite the presence of Mn4+ centers in both Mg2TiO4:Mn and MgTiO3:Mn ceramics confirmed by previous optical studies, no EPR signals related to Mn4+ ions (S = 3/2, І = 5/2) were found. The Mn2+ EPR signals are proposed as structural probes in manganese-doped magnesium titanate ceramics.
Funder
Bilateral DNIPRO program
European Structural and Investment Funds and the Czech Ministry of Education
Publisher
The Electrochemical Society
Subject
Electronic, Optical and Magnetic Materials
Cited by
2 articles.
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