1. School of Material Science and Engineering, School of Antiquities Preservation Science and Technology, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi’an710021, P. R. China
2. Research Institute of Cultural Relics, Shanghai University, Shanghai200444, P. R. China
3. Shaanxi Academy of Archaeology, Xi’an710000, P. R. China