Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 China;
Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 China;
Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 China;
Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 China;
Institute of Physics Chinese Academy of Sciences Beijing 100080 China;
Institute of Physics Chinese Academy of Sciences Beijing 100080 China;
nano-crystals ZnO; high temperature and pressure; grain evolution;