HighTemperatureMaterialsResearchlaboratories;
UniversityofScienceandTechnologyBeijing;
Beijing100083;
China;
DepartmentofPhysics;
NingxiaUniversity;
Yinchuan750021;
China;
HighTemperatureMaterialsResearchLaboratories;
UniversityofScienceandTechnologyBeijing;
Beiiing100083;
China;