Structural with Rietveld analysis and enhancement of magnetic, magnetocaloric study of Al substituted Ni–Cd bulk spinel ferrites

IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Nur Mohammed, Arjumanara Bagum, Md. Shahbaz Khan, M. Belal Hossen
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Abstract

Ni0.65Cd0.35Fe2-xAlxO4 (0 ≤ x ≤ 0.060) disc shape bulk specimen fabricated from the sol–gel synthesized nanocrystalline powders. According to a structural analysis using XRD and Rietveld refinement, single-phase cubic spinel structure confirmed. Crystalline size (40–36) nm calculated using Scherer’s formula. SEM images used to study surface morphology and grain size found decreasing trend from (1.4–1.0) μm. The saturation magnetization (Ms) as well as magnetic moment increased for x = 0.45 and beyond that it decreased with Al content, which phenomenon is attributed due to the reduction of length between tetrahedral (A) sites and octahedral [B] sites of cations. The temperature-dependent magnetization graphs shown sharply declining value of the temperature (i.e., dM/dT maximum) dropping from 582.27 to 578.76 K at the Curie point with Al concentration. The maximum magnetic entropy change (− \(\Delta S_{M}^{\max }\) ) derived from the Maxwell relation, is determined to be (0.54–0.72) JKg−1 K−1 as well as to relative cooling power of (43.18–56.97) Jkg−1 with an applied magnetic field of μ0H = 3 T. UV–visible spectroscopy utilized to explore optical study and found enhancement of absorption properties with Al content.

用Rietveld分析结构和增强磁性,研究Al取代Ni-Cd块状尖晶石铁氧体的磁热学
用溶胶-凝胶法制备了Ni0.65Cd0.35Fe2-xAlxO4(0≤x≤0.060)片状体试样。通过XRD和Rietveld细化分析,证实了该材料的单相立方尖晶石结构。晶体尺寸(40-36)nm计算使用谢勒公式。表面形貌和晶粒尺寸在(1.4 ~ 1.0)μm范围内呈减小趋势。在x = 0.45时,饱和磁化强度(Ms)和磁矩随Al含量的增加而增加,超过该值磁矩随Al含量的增加而减小,这是由于阳离子的四面体(A)位与八面体[B]位之间的长度减小所致。随着Al浓度的增加,居里点温度(即dM/dT最大值)从582.27 K急剧下降到578.76 K。由麦克斯韦关系导出的最大磁熵变化(−\(\Delta S_{M}^{\max }\))为(0.54-0.72)JKg−1 K−1,外加磁场为μ0H = 3 t时的相对冷却功率为(43.18-56.97)JKg−1,紫外可见光谱法用于光学研究,发现Al含量的增加增强了吸收性能。
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来源期刊
Applied Physics A
Applied Physics A 工程技术-材料科学:综合
CiteScore
4.80
自引率
7.40%
发文量
964
审稿时长
38 days
期刊介绍: Applied Physics A publishes experimental and theoretical investigations in applied physics as regular articles, rapid communications, and invited papers. The distinguished 30-member Board of Editors reflects the interdisciplinary approach of the journal and ensures the highest quality of peer review.
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