1. Centre for Mineral Materials, School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
2. Department of Physics, Key Lab for Low-Dimensional Structures and Quantum Manipulation (Ministry of Education), Hunan Normal University, Changsha 410081, China
3. Hunan International Joint Lab of Mineral Materials, Central South University, Changsha 410083, China
4. Key Lab of Clay Mineral Functional Materials in China Building Materials Industry, Central South University, Changsha 410083, China