Abstract:
:Crystal and electronic structures of ~380 nm BiFeO3 film grown on LaAlO3 substrate are comprehensively studied using advanced transmission electron microscopy (TEM) technique combined with first-principles theory. Cross-sectional TEM images reveal the BiFeO3 film consists of two zones with different crystal structures. While zone II turns out to have rhombohedral BiFeO3, the crystal structure of zone I matches none of BiFeO3 phases reported experimentally or predicted theoretically. Detailed electron diffraction analysis combined with first-principles calculation allows us to determine that zone I displays an orthorhombic-like monoclinic structure with space group of Cm (=8). The growth mechanism and electronic structure in zone I are further discussed in comparison with those of zone II. This study is the first to provide an experimentally validated complete crystallographic detail of a highly strained BiFeO3 that includes the lattice parameter as well as the basis atom locations in the unit cell.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Bae IT,Kovács A,Zhao HJ,Íñiguez J,Yasui S,Ichinose T,Naganuma Hdoi
10.1038/srep46498subject
Has Abstractpub_date
2017-04-19 00:00:00pages
46498issn
2045-2322pii
srep46498journal_volume
7pub_type
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