Na2Gd2(BO3)2O 晶体的生长和磁致效应

IF 1.7 4区材料科学 Q3 CRYSTALLOGRAPHY

Journal of Crystal Growth Pub Date : 2024-03-12 DOI:10.1016/j.jcrysgro.2024.127659

Yuwei Chen , Wang Liu , Zuhua Chen , Zhenxing Li , Jun Shen , Heng Tu , Guochun Zhang

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引用次数: 0

摘要

利用顶部播种溶液生长法（TSSG），采用 Na2O - NaF - B2O3 通量体系（最佳摩尔比为 Na2Gd2(BO3)2O : Na2CO3 : NaF : H3BO3 = 1:2:6:4），成功生长出高质量的 Na2Gd2(BO3)2O 晶体。研究了磁性和磁致性，包括磁感应强度（χ）、磁化率（M）和等温磁熵变（-ΔSm）测量。Na2Gd2(BO3)2O 表现出很大的磁致效应，在 2 K 和 7 T 时的最大 -ΔSm 为 41.6 J-kg-1-K-1，高于商用 Gd3Ga5O12（GGG，在 2 K 和 7 T 时 -ΔSm = 38.4 J-kg-1-K-1）和大多数其他 Gd3+ 基硼酸盐，显示出在磁制冷领域的潜在应用。

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Growth and magnetocaloric effect of Na2Gd2(BO3)2O crystal

High-quality Na₂Gd₂(BO₃)₂O crystals have been successfully grown using the top-seeded solution growth method (TSSG), employing a Na₂O - NaF - B₂O₃ flux system with optimal molar ratios of Na₂Gd₂(BO₃)₂O : Na₂CO₃ : NaF : H₃BO₃ = 1:2:6:4. The magnetic and magnetocaloric properties were investigated including magnetic susceptibility (χ), magnetization (M), and isothermal magnetic entropy change (−ΔS_m) measurements. Na₂Gd₂(BO₃)₂O exhibits a large magnetocaloric effect with a maximum − ΔS_m of 41.6 J·kg⁻¹·K⁻¹ at 2 K and 7 T, which is higher than that of commercial Gd₃Ga₅O₁₂ (GGG, −ΔS_m = 38.4 J·kg⁻¹·K⁻¹ at 2 K and 7 T) and most other Gd³⁺-based borates, showing the potential application in the field of magnetic refrigeration.

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来源期刊

Journal of Crystal Growth 化学-晶体学

CiteScore

3.60

自引率

11.10%

发文量

373

审稿时长

65 days

期刊介绍： The journal offers a common reference and publication source for workers engaged in research on the experimental and theoretical aspects of crystal growth and its applications, e.g. in devices. Experimental and theoretical contributions are published in the following fields: theory of nucleation and growth, molecular kinetics and transport phenomena, crystallization in viscous media such as polymers and glasses; crystal growth of metals, minerals, semiconductors, superconductors, magnetics, inorganic, organic and biological substances in bulk or as thin films; molecular beam epitaxy, chemical vapor deposition, growth of III-V and II-VI and other semiconductors; characterization of single crystals by physical and chemical methods; apparatus, instrumentation and techniques for crystal growth, and purification methods; multilayer heterostructures and their characterisation with an emphasis on crystal growth and epitaxial aspects of electronic materials. A special feature of the journal is the periodic inclusion of proceedings of symposia and conferences on relevant aspects of crystal growth.