Data di Pubblicazione:
2000
Abstract:
Electron paramagnetic resonance (EPR) and static magnetic susceptibility measurements were carried out on lanthanum-manganese substituted (up to 10 mol%) strontium titanate polycrystalline samples. X-ray diffraction (XRD) analysis revealed in each sample a single cubic perovskite phase with a different lattice parameter. Only weak and narrow EPR signals from a small fraction of Mn2+ and Mn4+ ions were observed when the La and Mn content did not exceed 5 mol%, indicating the nearly complete stabilisation of the Mn3+ oxidation state. Heavily substituted samples showed another EPR signal, very broad and with intensity and resonance field strongly temperature dependent. For these samples, a complex dynamics of Mn3+ stabilisation is suggested, supported by micro-Raman data
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
disordered systems, grain boundaries, x-ray scattering, electron paramagnetic resonance, static magnetic susceptibility
Elenco autori:
Azzoni, Carlo; Mozzati, MARIA CRISTINA; Galinetto, Pietro; Paleari, A.; Massarotti, Vincenzo; Bini, Marcella; Capsoni, Doretta
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