探索用于液氮温度下先进磁制冷的富铜 CuxMn3-xO4 Spinels 的结构和磁特性

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Abir Hadded;Igor Veremchuk;Shengqiang Zhou;Denys Makarov;Essebti Dhahri
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引用次数: 0

摘要

铜锰氧化物尖晶石在液氮温度下具有显著的磁致性能。我们采用软化学溶胶-凝胶法制备了标称铜含量为 x = 1、1.5、1.8 和 2 的 CuxMn3-xO4 样品。根据粉末 X 射线衍射研究,我们成功制备出了尖晶石相中铜含量较高的多相样品。我们深入了解了合成样品的结构、磁性和磁致性。我们发现,与 x = 1.0 和 1.5 的铁磁耦合样品不同,x = 1.8 和 2.0 的样品具有铁磁耦合。过渡温度仅从 78 K(x = 1)略微下降到 75 K(x = 2)。确定了每种化合物的磁熵变化和相对冷却功率的最大值,发现 x = 1.0 的样品由于磁化最大而磁熵变化和相对冷却功率最大。与铜含量无关,所研究的样品显示出大于 139 J/kg 的相对冷却功率,这凸显了这些材料在磁制冷应用中的相关性,尤其是在液氮温度下。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Exploring the Structural and Magnetic Properties of Cu-Rich CuxMn3−xO4 Spinels for Advanced Magnetic Refrigeration at Liquid Nitrogen Temperatures
Cu–Mn oxide spinels reveal notorious magnetocaloric performance at liquid nitrogen temperatures. We applied the soft chemistry sol–gel method to prepare Cu x Mn 3− x O 4 samples with nominal Cu content of x = 1, 1.5, 1.8, and 2. According to powder X-ray diffraction studies, we succeeded to fabricate multiphase samples with a high content of Cu in spinel phases. We provide insights into the structural and magnetic, as well as magnetocaloric, properties of the synthesized samples. We determine that in contrast to samples with x = 1.0 and 1.5, which are coupled ferromagnetically, the samples with x = 1.8 and 2.0 reveal ferrimagnetic coupling. The transition temperature is found to decrease only slightly from 78 K ( x = 1) to 75 K ( x = 2). The maximum values of the magnetic entropy change and relative cooling power are determined for each compound and found to be the largest for the sample with x = 1.0 due to its largest magnetization. Independent of the Cu content, here, the studied samples reveal a relative cooling power of larger than 139 J/kg, which highlights the relevance of these materials for magnetic refrigeration applications, particularly at liquid nitrogen temperatures.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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