Effect of oxygen content and nonstoichiometry defects on the phase transformations in manganites of the La0.65Sr0.35Mn1−x−y Ni x Ti y O3 + γ system

Musaeva, Z. R.; Badelin, A. G.; Smirnov, A. M.; Karpasyuk, V. K.; Пономарев, В. И.; Shchepetkin, A. A.

doi:10.3103/s1062873810100424

Cited by 9 publications

(3 citation statements)

References 8 publications

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“…The presence of anion vacancies here is hardly possible, because in this case ferromagnetic properties and characteristics of conductivity would sharply deteriorate [2,12], which is not observed in our case.…”

Section: Resultscontrasting

confidence: 54%

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

et al. 2015

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Regularities of the inuence of quadrivalent ions and oxygen concentrations on the structural characteristics, saturation magnetization, Curie point, temperature dependence of electrical conductance of ceramic manganites La1−c−xSrc+xMn1−xMe 4+x O3+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 dierent charge states) was determined using the modied model of eective cationanion 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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Section: Resultscontrasting

confidence: 54%

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

et al. 2015

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“…Phenomenon under consideration can be due to the transition of Ni 2 ions from octahedral sublattice for vacancies in the sublattice of lanthanum-strontium. The possibility of such rearrangement of cations and vacancies was considered in [8,9]. As a result tolerance factor [1] of manganite decreases, and T C rises.…”

Section: Resultsmentioning

confidence: 99%

“…Since manganites, as well as ferrites, are oxide phases of variable composition containing ions of variable valency, great number of point defects, dislocations, and interacting with the surrounding atmosphere, there are common mechanisms and regularities of ageing processes in these groups of materials related to the thermodynamics and kinetics of solid-phase reactions [8][9][10]. General cause of the ageing is the lack of a true thermodynamic equilibrium under specified conditions.…”

Section: Introductionmentioning

confidence: 99%

Ageing Phenomena in La-Sr Manganites with Divalent Substituents for Manganese

et al. 2018

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Variations of electromagnetic and structural characteristics of La1¡c xSrc¡xMn1¡xMexO3 γ manganites (Me = Zn, Ni) during storage time up to 36000 hours at room temperature and after frequentative thermal cycling in the 300-573 K range were investigated. Changes of magnetization of all samples were within the error of measurement. In most cases Curie point (TC) showed irregular variations within the range of 20%, while zinc-substituted manganites with relatively high values of "c" exhibited some trend of TC rise. The resistance of all samples increased during storage period. The cell volume of single-phase manganites decreased over time, that may indicates an increase in oxygen content. However, the sample with the highest Ni content (x 0.125) at c 0.19 suffered phase transition "rhombohedral-orthorhombic structures", which cannot be explained by the oxygen absorption. Probably, this effect was due to the rearrangement of the ions and vacancies between crystal sublattices of manganite.

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Structural and electronic transformations in substituted La-Sr manganites depending on cations and oxygen content

Karpasyuk

Badelin

Merkulov

et al. 2018

Physica B: Condensed Matter

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Effect of oxygen content and nonstoichiometry defects on the phase transformations in manganites of the La0.65Sr0.35Mn1−x−y Ni x Ti y O3 + γ system

Cited by 9 publications

References 8 publications

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

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

Ageing Phenomena in La-Sr Manganites with Divalent Substituents for Manganese

Structural and electronic transformations in substituted La-Sr manganites depending on cations and oxygen content

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