Chen Lei, Cheng Peng, Zhang Zhao, He Liangrui, Jiang Yang, Li Guobao, Jing Xiping, Qin Yan'guang, Yin Min, Chan Ting-Shan, Hong Bin, Tao Shi, Chu Wangsheng, Zhao Zhi, Ni Haiyong, Kohlmann Holger, Oeckler Oliver
School of Materials Science and Engineering Hefei University of Technology Hefei 230009 China.
Intelligent Manufacturing Institute of Hefei University of Technology Hefei 230051 China.
Adv Sci (Weinh). 2019 May 20;6(16):1802126. doi: 10.1002/advs.201802126. eCollection 2019 Aug 21.
Research on lithium compounds has attracted much attention nowadays. However, to elucidate the precise structure of lithium compounds is a challenge, especially when considering the small ions that may be transferred between the interstitial voids. Here, the discovery of reduced local symmetry (symmetry breaking) in small domains of LiSrSiO is reported by employing Eu as a spectroscopic probe, for which X-ray, neutron, and electron diffraction have confirmed the average long-range structure with the space group 321. However, luminescence shows a lower local symmetry, as confirmed by the extended X-ray absorption fine structure. By considering the reduced symmetry of the local structure, this work opens the door to a new class of understanding of the properties of materials.
如今，锂化合物的研究备受关注。然而，阐明锂化合物的精确结构是一项挑战，尤其是当考虑到可能在间隙空隙之间转移的小离子时。在此，通过使用铕作为光谱探针，报道了在LiSrSiO的小区域中发现局部对称性降低（对称性破缺），X射线、中子和电子衍射已证实其平均长程结构属于空间群321。然而，发光显示出较低的局部对称性，扩展X射线吸收精细结构证实了这一点。通过考虑局部结构对称性的降低，这项工作为理解材料特性开辟了一类新的途径。
