title: Controlling self-assembled perovskite-spinel nanostructures.
abstract: 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.
authors.affiliation: Department of Materials Science and Engineering, University of California, Berkeley, 94720, USA. haimei@berkeley.edu
authors.forename: Haimei
authors.initials: H
authors.lastname: Zheng
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhan
authors.forename: Florin
authors.initials: F
authors.lastname: Zavaliche
authors.forename: Matt
authors.initials: M
authors.lastname: Sherburne
authors.forename: Florian
authors.initials: F
authors.lastname: Straub
authors.forename: Maria P
authors.initials: MP
authors.lastname: Cruz
authors.forename: Long-Qing
authors.initials: LQ
authors.lastname: Chen
authors.forename: Uli
authors.initials: U
authors.lastname: Dahmen
authors.forename: R
authors.initials: R
authors.lastname: Ramesh
mesh_terms: 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*
chemical_list: D017610:Calcium Compounds; D010087:Oxides; C111130:spinell; C059910:perovskite; D008277:Magnesium Oxide; D014025:Titanium; D000537:Aluminum Oxide