Abstract
Solid solutions La1 − 0.33y Ba0.33y Mn y Al1 − y O3 (y = 0.02, 0.04, 0.10) prepared using the ceramic technique have been investigated by the EPR method at temperatures of 77 and 300 K. By comparing with the calculated spectra, the experimental spectra have been assigned to Mn2+ ions (g = 2.04 and line width ΔH pp = 64 × 10−4 T at T = 77K) and Mn4+ ions (g = 1.97 and ΔH pp = 76 × 10−4 T at T = 77 K) and the broad line (ΔH pp = 500 × 10−4 T at T = 77 K) has been attributed to clusters. The dilution of manganese ions as a result of the dissolution of La0.67Ba0.33MnO3 in LaAlO3 has allowed one to trace the cluster formation and the spin dynamics of Mn ions. It has been established that, at room temperature, compared to the system in which the Sr2+ ion with a smaller ionic radius is the replacing element, the localized states are more stable at all three manganese concentrations (the EPR lines are more intense). The La0.67Ba0.33MnO3 clusters dissolved in LaAlO3 retain some properties of a concentrated compound even upon dilution to y = 0.02.
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Original Russian Text © S.I. Andronenko, R.R. Andronenko, O.A. Zagrebel’nyi, 2010, published in Fizika i Khimiya Stekla.
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Andronenko, S.I., Andronenko, R.R. & Zagrebel’nyi, O.A. EPR study of solid solutions La1 − 0.33y Ba0.33y Mn y Al1 − y O3 (y = 0.02, 0.04, 0.10). Glass Phys Chem 36, 617–622 (2010). https://doi.org/10.1134/S1087659610050111
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DOI: https://doi.org/10.1134/S1087659610050111