Effect of Oxygen Concentration on Structural and Electromagnetic Characteristics of La-Sr Manganites with Manganese Replacement by Combination of Zinc and Titanium

Experimental data on the properties of ceramic manganites La 0.7 Sr 0.3 Mn 0.9 0.1 O 3 + γ with different oxygen concentrations are presented. Variations of oxygen nonstoichiometry index (γ) were achieved by heat treatment of the samples at different partial pressure of oxygen in the gas phase. All...

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2022-07, Vol.67 (7), p.1113-1117
Main Authors: Karpasyuk, V. K., Badelin, A. G., Datskaya, Z. R., Derzhavin, I. M., Estemirova, S. Kh
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Curie temperature
Electromagnetic properties
Heat treatment
Inorganic Chemistry
Inorganic Materials and Nanomaterials
Magnetic transitions
Magnetoresistance
Magnetoresistivity
Manganese
Manganites
Oxygen
Oxygen content
Partial pressure
Phase transitions
Titanium
Unit cell
Vapor phases
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Summary:Experimental data on the properties of ceramic manganites La 0.7 Sr 0.3 Mn 0.9 0.1 O 3 + γ with different oxygen concentrations are presented. Variations of oxygen nonstoichiometry index (γ) were achieved by heat treatment of the samples at different partial pressure of oxygen in the gas phase. All synthesized samples have rhombohedral structure. The γ index is calculated from the data on the change in unit cell volume of manganites relative to stoichiometric sample. Unit cell volume decreases as a function of γ in the range from –0.008 to 0.009, and specific magnetization exhibits the tendency for increase. Curie point is weakly dependent on γ, while the sample with the maximum oxygen content has the smallest temperature interval width of magnetic transition. The temperature of “metal–semiconductor” phase transformation decreases with increasing γ. Manganite with γ = –0.008 has the highest absolute value of magnetoresistance: | MR | = 60% in the field of 0.92 T. Established regularities are discussed taking into account mechanisms of charge compensation, electronic configuration and radii of manganese substituents, double exchange, Coulomb interaction, diffusion processes and the formation of microinhomogeneities.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023622070117