[1
]Electronic Materials Research Laboratory; Key Laboratory of the Ministry of Education
and International Center for Dielectric Research; School of Electronic and Information
Engineering; Xi'an Jiaotong University; Xi'an 710049 China
[2
]School of Materials Science and Engineering; Shaanxi University of Science and Technology;
Xi'an 710021 China
[3
]Institute for Superconducting and Electronic Materials; Australian Institute of Innovative
Materials; University of Wollongong; NSW 2500 Australia