V. K. Karpasyuk, A. G. Badelin, D. I. Merkulov, S. Kh. Estemirova
{"title":"锰取代基电子构型和氧浓度对La-Sr锰矿石结构、磁性和电学特性的影响","authors":"V. K. Karpasyuk, A. G. Badelin, D. I. Merkulov, S. Kh. Estemirova","doi":"10.1134/S2075113325701564","DOIUrl":null,"url":null,"abstract":"<p>Manganites La<sub>0.7</sub>Sr<sub>0.3</sub>Mn<sub>0.9</sub>Fe<sub>0.05</sub>Me<sub>0.05</sub>O<sub>3+γ</sub> (Me = Sc, Co) with different oxygen content (γ < 0, γ = 0, γ > 0) were synthesized. Corresponding values of γ were obtained by annealing of sintered samples at different oxygen pressures: 10<sup>–8</sup>, 10<sup>–1</sup>, 10<sup>5</sup> Pa, respectively. All synthesized manganites have rhombohedral structure and are characterized by small value of microdistortions, which is associated with the formation of modulated structures. Microstructure of the samples is quite dense, with an average crystallites diameter of 3.9 ± 1.6 μm for scandium-containing manganite and 3.1 ± 1.3 μm for (Fe,Co)-substituted manganite. Unit cell parameters and electromagnetic characteristics of the latter indicate the presence of Co<sup>3+</sup>(3<i>d</i> <sup>6</sup>) ions in its composition. (Fe,Sc)-containing manganites have lower magnetization values, Curie points and a significantly lower metal-semiconductor transition temperature compared to those containing iron and cobalt. Current–voltage (<i>I–V</i>) characteristics of La<sub>0.7</sub>Sr<sub>0.3</sub>Mn<sub>0.9</sub>Fe<sub>0.05</sub>Sc<sub>0.05</sub>O<sub>3+γ</sub> and La<sub>0.7</sub>Sr<sub>0.3</sub>Mn<sub>0.9</sub>Fe<sub>0.05</sub>Co<sub>0.05</sub>O<sub>3+γ</sub> manganites with negative deviation from oxygen stoichiometry and stoichiometric exhibit negative differential resistance of <i>S-</i>type in certain temperature ranges, and <i>I</i>–<i>V</i> characteristics of (Fe,Co)-substituted manganite in magnetic field contain two <i>S-</i>shaped sections. Threshold switching fields and maximum values of negative differential resistance modulus of <i>I–V</i> characteristics at different temperatures are determined. (Fe,Sc)-substituted manganite with an excess oxygen content at 190–200 K exhibits voltage stabilization effect. <i>I</i>–<i>V</i> characteristic of (Fe,Co)-substituted manganite annealed in oxygen does not contain the sections with negative differential resistance. Mechanisms of the formation of current-voltage characteristics of various types are considered.</p>","PeriodicalId":586,"journal":{"name":"Inorganic Materials: Applied Research","volume":"16 5","pages":"1461 - 1467"},"PeriodicalIF":0.3000,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Structural, Magnetic and Electrical Characteristics of La–Sr Manganites Depending on Electronic Configuration of Manganese Substituents and Oxygen Concentration\",\"authors\":\"V. K. Karpasyuk, A. G. Badelin, D. I. Merkulov, S. Kh. Estemirova\",\"doi\":\"10.1134/S2075113325701564\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Manganites La<sub>0.7</sub>Sr<sub>0.3</sub>Mn<sub>0.9</sub>Fe<sub>0.05</sub>Me<sub>0.05</sub>O<sub>3+γ</sub> (Me = Sc, Co) with different oxygen content (γ < 0, γ = 0, γ > 0) were synthesized. Corresponding values of γ were obtained by annealing of sintered samples at different oxygen pressures: 10<sup>–8</sup>, 10<sup>–1</sup>, 10<sup>5</sup> Pa, respectively. All synthesized manganites have rhombohedral structure and are characterized by small value of microdistortions, which is associated with the formation of modulated structures. Microstructure of the samples is quite dense, with an average crystallites diameter of 3.9 ± 1.6 μm for scandium-containing manganite and 3.1 ± 1.3 μm for (Fe,Co)-substituted manganite. Unit cell parameters and electromagnetic characteristics of the latter indicate the presence of Co<sup>3+</sup>(3<i>d</i> <sup>6</sup>) ions in its composition. (Fe,Sc)-containing manganites have lower magnetization values, Curie points and a significantly lower metal-semiconductor transition temperature compared to those containing iron and cobalt. Current–voltage (<i>I–V</i>) characteristics of La<sub>0.7</sub>Sr<sub>0.3</sub>Mn<sub>0.9</sub>Fe<sub>0.05</sub>Sc<sub>0.05</sub>O<sub>3+γ</sub> and La<sub>0.7</sub>Sr<sub>0.3</sub>Mn<sub>0.9</sub>Fe<sub>0.05</sub>Co<sub>0.05</sub>O<sub>3+γ</sub> manganites with negative deviation from oxygen stoichiometry and stoichiometric exhibit negative differential resistance of <i>S-</i>type in certain temperature ranges, and <i>I</i>–<i>V</i> characteristics of (Fe,Co)-substituted manganite in magnetic field contain two <i>S-</i>shaped sections. Threshold switching fields and maximum values of negative differential resistance modulus of <i>I–V</i> characteristics at different temperatures are determined. (Fe,Sc)-substituted manganite with an excess oxygen content at 190–200 K exhibits voltage stabilization effect. <i>I</i>–<i>V</i> characteristic of (Fe,Co)-substituted manganite annealed in oxygen does not contain the sections with negative differential resistance. 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Structural, Magnetic and Electrical Characteristics of La–Sr Manganites Depending on Electronic Configuration of Manganese Substituents and Oxygen Concentration
Manganites La0.7Sr0.3Mn0.9Fe0.05Me0.05O3+γ (Me = Sc, Co) with different oxygen content (γ < 0, γ = 0, γ > 0) were synthesized. Corresponding values of γ were obtained by annealing of sintered samples at different oxygen pressures: 10–8, 10–1, 105 Pa, respectively. All synthesized manganites have rhombohedral structure and are characterized by small value of microdistortions, which is associated with the formation of modulated structures. Microstructure of the samples is quite dense, with an average crystallites diameter of 3.9 ± 1.6 μm for scandium-containing manganite and 3.1 ± 1.3 μm for (Fe,Co)-substituted manganite. Unit cell parameters and electromagnetic characteristics of the latter indicate the presence of Co3+(3d6) ions in its composition. (Fe,Sc)-containing manganites have lower magnetization values, Curie points and a significantly lower metal-semiconductor transition temperature compared to those containing iron and cobalt. Current–voltage (I–V) characteristics of La0.7Sr0.3Mn0.9Fe0.05Sc0.05O3+γ and La0.7Sr0.3Mn0.9Fe0.05Co0.05O3+γ manganites with negative deviation from oxygen stoichiometry and stoichiometric exhibit negative differential resistance of S-type in certain temperature ranges, and I–V characteristics of (Fe,Co)-substituted manganite in magnetic field contain two S-shaped sections. Threshold switching fields and maximum values of negative differential resistance modulus of I–V characteristics at different temperatures are determined. (Fe,Sc)-substituted manganite with an excess oxygen content at 190–200 K exhibits voltage stabilization effect. I–V characteristic of (Fe,Co)-substituted manganite annealed in oxygen does not contain the sections with negative differential resistance. Mechanisms of the formation of current-voltage characteristics of various types are considered.
期刊介绍：
Inorganic Materials: Applied Research contains translations of research articles devoted to applied aspects of inorganic materials. Best articles are selected from four Russian periodicals: Materialovedenie, Perspektivnye Materialy, Fizika i Khimiya Obrabotki Materialov, and Voprosy Materialovedeniya and translated into English. The journal reports recent achievements in materials science: physical and chemical bases of materials science; effects of synergism in composite materials; computer simulations; creation of new materials (including carbon-based materials and ceramics, semiconductors, superconductors, composite materials, polymers, materials for nuclear engineering, materials for aircraft and space engineering, materials for quantum electronics, materials for electronics and optoelectronics, materials for nuclear and thermonuclear power engineering, radiation-hardened materials, materials for use in medicine, etc.); analytical techniques; structure–property relationships; nanostructures and nanotechnologies; advanced technologies; use of hydrogen in structural materials; and economic and environmental issues. The journal also considers engineering issues of materials processing with plasma, high-gradient crystallization, laser technology, and ultrasonic technology. Currently the journal does not accept direct submissions, but submissions to one of the source journals is possible.
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