结构畸变可调整Ho2NiTiO6的磁和磁热响应

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2025-06-28 DOI:10.1016/j.matlet.2025.138993

Sk. Anirban , Samarendra Nath Saha , Rosni Roy , Rajib Mondal

引用次数: 0

摘要

Ho2NiTiO6是一种双钙钛矿，在NiO6八面体中结晶为单斜晶（P21/n）结构，具有明显的Jahn-Teller畸变（Δd = 9.4%）。XPS证实了高自旋Ni2+ (t2g6eg2)和Ti4+ (3d0)态。磁测量结果显示，在TN≈5.5 K处铁磁向顺磁转变，并有优势的AFM相互作用（θCW =−10.9 K）。广泛的磁热熵变化是由自旋-晶格耦合和受挫的Ni-O-Ti几何引起的。相对制冷功率以RCP∝H1.24表示，反映了磁各向异性和热波动，突出了Ho2NiTiO6在低温磁制冷方面的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Structural distortions tailor magnetic and magnetocaloric response in Ho2NiTiO6

Ho₂NiTiO₆, a double perovskite, crystallizes in a monoclinic (P2₁/n) structure with significant Jahn-Teller distortion (Δd = 9.4 %) in NiO₆ octahedra. XPS confirms high-spin Ni²⁺ (

t_{2 g}^{6} e_{g}^{2}

) and Ti⁴⁺ (3d⁰) states. Magnetic measurements reveal ferromagnetic to paramagnetic transition at T_N ≈ 5.5 K and dominant AFM interactions (

θ_{CW}

= − 10.9 K). A broad magnetocaloric entropy change arises from spin-lattice coupling and frustrated Ni–O–Ti geometries. The relative cooling power scales as RCP ∝ H^1.24, reflecting magnetic anisotropy and thermal fluctuations, highlighting potential of Ho₂NiTiO₆ for cryogenic magnetic refrigeration.

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive