Structural, Magnetic and Electrical Characteristics of La–Sr Manganites Depending on Electronic Configuration of Manganese Substituents and Oxygen Concentration

IF 0.3 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Inorganic Materials: Applied Research Pub Date : 2025-09-24 DOI:10.1134/S2075113325701564

V. K. Karpasyuk, A. G. Badelin, D. I. Merkulov, S. Kh. Estemirova

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引用次数: 0

Abstract

Manganites La_0.7Sr_0.3Mn_0.9Fe_0.05Me_0.05O_3+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⁺(3d ⁶) 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 La_0.7Sr_0.3Mn_0.9Fe_0.05Sc_0.05O_3+γ and La_0.7Sr_0.3Mn_0.9Fe_0.05Co_0.05O_3+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.

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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

合成了不同氧含量（γ < 0, γ = 0, γ > 0）的锰酸盐La0.7Sr0.3Mn0.9Fe0.05Me0.05O3+γ (Me = Sc, Co)。在不同的氧压（10-8、10-1、105 Pa）下对烧结样品进行退火，得到相应的γ值。所有合成的锰矿石均具有菱形结构，微畸变值小，这与调制结构的形成有关。样品的显微结构致密，含钪锰矿的平均晶径为3.9±1.6 μm, （Fe,Co）取代锰矿的平均晶径为3.1±1.3 μm。后者的单元胞参数和电磁特性表明其组成中存在Co3+(3d - 6)离子。与含铁和钴的锰矿石相比，含（Fe,Sc）锰矿石具有更低的磁化值、居里点和更低的金属-半导体转变温度。La0.7Sr0.3Mn0.9Fe0.05Sc0.05O3+γ和La0.7Sr0.3Mn0.9Fe0.05Co0.05O3+γ锰酸盐的电流-电压（I-V）特性在一定温度范围内表现为负的s型差分电阻，且（Fe,Co）取代锰酸盐在磁场中的I-V特性包含两个s型截面。确定了不同温度下开关场的阈值和I-V特性负差分电阻模量的最大值。过量氧含量的（Fe,Sc）取代锰矿石在190 ~ 200 K时表现出电压稳定效应。氧退火（Fe,Co）取代锰矿的I-V特性不含负微分电阻部分。考虑了各种类型的电流-电压特性的形成机制。

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来源期刊

Inorganic Materials: Applied Research Engineering-Engineering (all)

CiteScore

0.90

自引率

0.00%

发文量

199

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.