1. Department of Materials Science and Engineering; National Dong Hwa University; Shoufeng Hualien 97401 Taiwan
2. Department of Materials and Optoelectronic Science; National Sun Yat-sen University; Kaohsiung 80424 Taiwan
3. Central Geological Survey; Zhonghe Taipei 23568 Taiwan
4. Institute of Earth Sciences; Academia Sinica; Nankang Taipei 11529 Taiwan