Investigation of the magnetocaloric properties of Bi doping in La0.7Ca0.27Na0.03Mn1-xBixO3 (x = 0.0, 0.005, 0.01 and 0.02) perovskites

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering B-advanced Functional Solid-state Materials Pub Date : 2024-10-20 DOI:10.1016/j.mseb.2024.117760

Mehmet Selim Aslan, Gönül Akça, Selda Kılıç Çetin, Ahmet Ekicibil

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Abstract

In the present study, the effects of Bi doping on the Mn-site of La_0.7Ca_0.27Na_0.03Mn_1-xBi_xO₃ perovskite manganites on their structural, magnetic, and magnetocaloric properties were investigated. From XRD analyses, the main La_0.7Ca_0.27Na_0.03MnO₃ manganite has a rhombohedral structure with space group

R \bar{3} c

. In contrast, manganites obtained by doping with x = 0.005, 0.01, and 0.02 Bi were found to have an orthorhombic structure with space group Pnma. The Curie temperature (T_C) is 310, 246, 235, and 232 K for x = 0.0, 0.005, 0.01 and 0.02, respectively. The maximum entropy change (

- Δ S_{M}^{\max})

values were calculated as 6.34, 8.24, 8.33, and 8.42 Jkg^-1K⁻¹ for x = 0.0, 0.005, 0.01 and 0.02, respectively. The highest Relative Cooling Power (RCP) value was computed as 271 Jkg⁻¹ for the sample with a Bi concentration of 0.01. It was determined from the H/M versus M² curves that all samples displayed a second-order magnetic phase transition.

Abstract Image

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对 La0.7Ca0.27Na0.03Mn1-xBixO3（x = 0.0、0.005、0.01 和 0.02）包晶中掺入 Bi 的磁致性的研究

本研究探讨了在 La0.7Ca0.27Na0.03Mn1-xBixO3 包晶锰矿的锰位上掺入 Bi 对其结构、磁性和磁致性的影响。通过 XRD 分析，主要的 La0.7Ca0.27Na0.03MnO3 锰矿具有斜方体结构，空间群为 R3¯c。相反，通过掺杂 x = 0.005、0.01 和 0.02 Bi 得到的锰矿具有正方体结构，空间群为 Pnma。当 x = 0.0、0.005、0.01 和 0.02 时，居里温度 (TC) 分别为 310、246、235 和 232 K。在 x = 0.0、0.005、0.01 和 0.02 时，最大熵变 (-ΔSMmax) 值分别为 6.34、8.24、8.33 和 8.42 Jkg-1K-1。计算得出铋浓度为 0.01 的样品的最高相对冷却功率 (RCP) 值为 271 Jkg-1。根据 H/M 与 M2 的关系曲线确定，所有样品都显示出二阶磁性相变。

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来源期刊

Materials Science and Engineering B-advanced Functional Solid-state Materials 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.