Controlling self-assembled perovskite-spinel nanostructures.
We report a discovery that self-assembled perovskite-spinel nanostructures can be controlled simply by selecting single-crystal substrates with different orientations. In a model BiFeO(3)-CoFe(2)O(4) system, a (001) substrate results in rectangular-shaped CoFe(2)O(4) nanopillars in a BiFeO(3) matrix; in contrast, a (111) substrate leads to triangular-shaped BiFeO(3) nanopillars in a CoFe(2)O(4) matrix, irrespective of the volume fraction of the two phases. This dramatic reversal is attributed to the surface energy anisotropy as an intrinsic property of a crystal.
Zheng
Haimei
H
Department of Materials Science and Engineering, University of California, Berkeley, 94720, USA. haimei@berkeley.edu
Zhan
Qian
Q
Zavaliche
Florin
F
Sherburne
Matt
M
Straub
Florian
F
Cruz
Maria P
MP
Chen
Long-Qing
LQ
Dahmen
Uli
U
Ramesh
R
R
D000537:Aluminum Oxide / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D008277:Magnesium Oxide / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
D017610:Calcium Compounds; D010087:Oxides; C111130:spinell; C059910:perovskite; D008277:Magnesium Oxide; D014025:Titanium; D000537:Aluminum Oxide