在一个一维的罗 (I) -半酸复合体中,具有可变多功能性和可切换的强铁磁对抗铁磁合
Minoru Mitsumi1, Takashi Nishitani, Shota Yamasaki
1Department of Material Science and ‡Research Center for New Functional Materials, Graduate School of Material Science, University of Hyogo , 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan.
Journal of the American Chemical Society
|April 23, 2014
概括
这项研究揭示了一种新型的 (I) -半酸复合物,具有可变磁性和导电性质. 它独特的相位过渡允许通过压力等外部刺激来控制多功能.
科学领域:
- 无机化学 无机化学 有机化学
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
背景情况:
- 一维 (1D) 协调复合体具有独特的电子和磁性质.
- 半联体可以调解磁相互作用并影响晶体包装.
- 通过温度和压力等外部刺激调整材料特性是材料科学的关键目标.
研究的目的:
- 为了合成和表征一种新的1D(I) - 半酸复合物.
- 调查该综合体的磁性和电性,重点关注潜在的多功能性.
- 了解观察到的双稳定性背后的机制及其对外部条件的依赖.
主要方法:
- (I) - 半酸复合物的合成 [Rh (I) 3,6-DBSQ-4,5-MeO (II) 2 (CO) 2) ∞.
- 使用X射线衍射进行结构分析.
- 磁性属性的表征 (易感性,有序性).
- 电导和电阻的测量.
- 密度函数理论 (DFT) 的计算.
主要成果:
- 该综合体在特定温度范围 (228-207 K) 内表现出前所未有的可双相磁性和导电性质,这是由于热歇斯底里的第一阶段过渡.
- 在低温阶段过渡到室温阶段反铁磁相互作用的强铁磁相互作用.
- 远程反铁磁性订制和自发磁化在14.2K.
- 在300K时,电导率相对较高 (4.8 × 10−4 S cm−1),电阻也显示出hysteresis.
- 铁磁低温阶段可以在室温下使用中等压力 (1.4 kbar) 稳定.
结论:
- (I) - 半酸复合物表现出非凡的双相多功能性,其驱动力来自结构阶段过渡,涉及键变化.
- 分子堆叠,磁相互作用 (铁磁到反铁磁) 和电导率之间的相互作用是显著的.
- 外部刺激,特别是压力,可以有效地控制和稳定材料的多功能状态,为可切换电子设备开辟道路.
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