%0 Journal Article
%A Buscaglia, M.T.
%A Buscaglia, V.
%A Viviani, M.
%A Dondero, G.
%A Röhrig, S.
%A Rüdiger, A.
%A Nanni, P.
%T Ferroelectric hollow particles obtained by solid-state reaction
%J Nanotechnology
%V 19
%@ 0957-4484
%C Bristol
%I IOP Publ.
%M PreJuSER-61844
%P 225602
%D 2008
%Z Record converted from VDB: 12.11.2012
%X Hollow particles of barium titanate were obtained by a two-step process combining colloidal chemistry and solid-state reaction. BaCO(3) crystals (size ≈1 µm) suspended in a peroxy-Ti(IV) aqueous solution were coated with an amorphous TiO(2) shell using a precipitation process. Calcination of the BaCO(3)@TiO(2) core-shell particles at 700 °C resulted in the formation of BaTiO(3) hollow particles (shell thickness of ≈70 nm) which retain the morphology of the BaCO(3) crystals. Formation of the cavity occurs because out-diffusion of the core phase is much faster than in-diffusion of the shell material. X-ray diffraction (XRD) and Raman spectroscopy indicate that the hollow particles possess a tetragonal ferroelectric structure with axial ratio c/a = 1.005. Piezoresponse force microscopy has shown strong piezoactivity and 180° ferroelectric domains. The process described provides a general route to fabricate hollow ferroelectric structures of several compounds.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:21825762
%U <Go to ISI:>//WOS:000255662500010
%R 10.1088/0957-4484/19/22/225602
%U https://juser.fz-juelich.de/record/61844