Xu Jiawang, Zheng Xinqi, Yang Shuxian, Xi Lei, Wang Shouguo, Zhang Lei, Yang Wenyun, Yang Jinbo, Ma Xiaobai, Chen Dongfeng, He Lunhua, Deng Sihao, Zhang Jingyan, Wu Yanfei, Shen Baogen
Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences & University of Chinese Academy of Sciences, Beijing 100190, China.
Inorg Chem. 2020 Jun 15;59(12):8603-8608. doi: 10.1021/acs.inorgchem.0c01048. Epub 2020 May 28.
A large linear negative thermal expansion (NTE) and expanded NTE temperature range (Δ) were obtained in magnetoelastic CrTeSe (0 ≤ ≤ 0.15) compounds. For CrTe compound, its thermal expansion coefficient of volume (α) was calculated to be -28.8 ppm K with the temperature ranging from 280 to 340 K. Substituting Te with Se atoms, the NTE behavior and magnetic properties can be well manipulated. With increasing Se in CrTeSe (0 ≤ ≤ 0.15) compounds, the Δ increases from 60 K (280-340 K for = 0), to 80 K (240-320 K for = 0.05), to 95 K (200-295 K for = 0.1), and finally to 100 K (170-270 K for = 0.15). Furthermore, a linear NTE remains independent of temperature for samples with ≤ 0.1. The relationship between tunable NTE and magnetic properties was analyzed in detail, indicating that the NTE in CrTeSe compounds originates from the magnetovolume effect (MVE).
在磁弹性CrTeSe（0≤≤0.15）化合物中获得了大的线性负热膨胀（NTE）和扩展的NTE温度范围（Δ）。对于CrTe化合物，计算出其在280至340 K温度范围内的体积热膨胀系数（α）为-28.8 ppm K。用Se原子替代Te，可以很好地调控NTE行为和磁性能。随着CrTeSe（0≤≤0.15）化合物中Se含量的增加，Δ从60 K（=0时为280 - 340 K）增加到80 K（=0.05时为240 - 320 K），再到95 K（=0.1时为200 - 295 K），最后到100 K（=0.15时为170 - 270 K）。此外，对于≤0.1的样品，线性NTE与温度无关。详细分析了可调谐NTE与磁性能之间的关系，表明CrTeSe化合物中的NTE源于磁体积效应（MVE）。
