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2015 | 127 | 2 | 248-250
Article title

Mechanisms of Substituting Quadrivalent Ions Influence on the Properties of La-Sr Manganites

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Abstracts
EN
Regularities of the influence of quadrivalent ions and oxygen concentrations on the structural characteristics, saturation magnetization, Curie point, temperature dependence of electrical conductance of ceramic manganites La_{1-c-x}Sr_{c+x}Mn_{1-x}Me^{4+x}O_{3+γ} (Me = Ti, Ge; 0.17 ≤ c ≤ 0.35; 0.025 ≤ x ≤ 0.125) were established. The relation between experimental data on lattice parameters, electromagnetic properties and crystal chemistry characteristics (nonstoichiometry index, concentrations of ions residing at different charge states) was determined using the modified model of effective cation-anion distances. The data obtained provide some evidence that in Ti-containing manganites when Sr concentration is more than 0.375, single-charged oxygen ions can arise after reductive annealing.
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author
  • Astrakhan State University, Tatishchev str. 20a, 414056 Astrakhan, Russia
author
  • Astrakhan State University, Tatishchev str. 20a, 414056 Astrakhan, Russia
author
  • Institute for Metallurgy, Russian Academy of Sciences, Amundsen str. 101, 620016 Yekaterinburg, Russia
author
  • Astrakhan State University, Tatishchev str. 20a, 414056 Astrakhan, Russia
References
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YADDA identifier
bwmeta1.element.bwnjournal-article-appv127n2026kz
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