Abstract:
:Integrated single-crystal-like small and wide-angle X-ray diffraction images of a CdSe nanosheet under pressure provide direct experimental evidence for the detailed pathway of transformation of the CdSe from a wurtzite to a rock-salt structure. Two consecutive planar atomic slips [(001) {110} in parallel and (102) {101}with a distortion angle of ∼40°] convert the wurtzite-based nanosheet into a saw-like rock-salt nanolayer. The transformation pressure is three times that in the bulk CdSe crystal. Theoretical calculations are in accord with the mechanism and the change in transformation pressure, and point to the critical role of the coordinated amines. Soft ligands not only increase the stability of the wurtzite structure, but also improve its elastic strength and fracture toughness. A ligand extension of 2.3 nm appears to be the critical dimension for a turning point in stress distribution, leading to the formation of wurtzite (001)/zinc-blende (111) stacking faults before rock-salt nucleation.
journal_name
Proc Natl Acad Sci U S Aauthors
Wang Z,Wen XD,Hoffmann R,Son JS,Li R,Fang CC,Smilgies DM,Hyeon Tdoi
10.1073/pnas.1011224107subject
Has Abstractpub_date
2010-10-05 00:00:00pages
17119-24issue
40eissn
0027-8424issn
1091-6490pii
1011224107journal_volume
107pub_type
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