Li Shaopeng, Huang Rongjin, Zhao Yuqiang, Wang Wei, Li Laifeng
Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P. R. China.
Phys Chem Chem Phys. 2015 Dec 14;17(46):30999-1003. doi: 10.1039/c5cp03948g.
Recently, La(Fe,Si)13-based compounds have attracted much attention due to their isotropic and tunable abnormal thermal expansion (ATE) properties as well as bright prospects for practical applications. In this research, we have prepared cubic NaZn13-type carbon-doped La(Fe,Si)13 compounds by the arc-melting method, and their ATE and magnetic properties were investigated by means of variable-temperature X-ray diffraction, strain gauge and the physical property measurement system (PPMS). The experimental results indicate that both micro and macro negative thermal expansion (NTE) behaviors gradually weaken with the increase of interstitial carbon atoms. Moreover, the temperature region with the most remarkable NTE properties has been broadened and near zero thermal expansion (NZTE) behavior occurs in the bulk carbon-doped La(Fe,Si)13 compounds.
近年来，基于La(Fe,Si)13的化合物因其各向同性且可调节的反常热膨胀（ATE）特性以及实际应用的广阔前景而备受关注。在本研究中，我们通过电弧熔炼法制备了立方NaZn13型碳掺杂La(Fe,Si)13化合物，并借助变温X射线衍射、应变仪和物理性能测量系统（PPMS）对其ATE和磁性能进行了研究。实验结果表明，随着间隙碳原子数量的增加，微观和宏观负热膨胀（NTE）行为均逐渐减弱。此外，具有最显著NTE特性的温度区间得以拓宽，并且在块状碳掺杂La(Fe,Si)13化合物中出现了近零热膨胀（NZTE）行为。
