14.06 14.63 BO3 24 :一种富含加多的酸,具有磁性制冷性能
Yuwei Chen1,2, Wang Liu1,2, Dong Wang3
1Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
合成了一种新的加多玻酸盐晶体,它表现出显著的磁热效应. 这种材料在低温下显示出比商业加多石榴石 (GGG) 更大的磁变化.
科学领域:
- 固态化学 固态化学
- 材料科学 材料科学 材料科学
- 磁力学 磁力学 是一种
背景情况:
- 开发具有较大的磁热效应的先进材料对于高效的磁性制冷技术至关重要.
- 与稀土元素合的玻酸盐是这种应用的潜在候选者,因为它们的结构和磁性特性.
研究的目的:
- 为了合成一种新型的加多玻酸单晶.
- 为了研究它的晶体结构和磁性.
- 为了评估其磁热效应对潜在的冷应用.
主要方法:
- 单晶生长使用高温溶液技术与K2O-KF-B2O3流量.
- 用X射线衍射来确定晶体结构.
- 磁性测量以确定磁热效应 (磁性变化).
- 光谱 (IR,UV-Vis-NIR) 和热分析.
主要成果:
- 成功培养了Sr14.06Gd14.63(BO3) 24单晶,在特定的空间组中结晶,具有确定的格子参数.
- 晶体结构具有[GdO]链与[BO3]3-组和Sr2+离子的3D框架.
- 观察到一个很大的磁热效应,在2K和7T时磁变化为-ΔSm = 42.2 J kg-1 K-1 ,超过Gd3Ga5O12 (GGG) 的磁变化.
结论:
- 合成的Sr-Gd酸盐是磁性制冷的有希望的材料,因为其优越的磁热性能.
- 这项研究为稀土酸盐的结构性质关系提供了宝贵的见解.
- 进一步的研究可以探索优化这种材料用于实际的冷却应用.
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