K. Han et K. Yu-zhang, Transmission electron microscopy study of epitaxial lanthanum-manganite thin films on SrTiO3, PHIL MAG B, 79(6), 1999, pp. 897-909
The microstructure of lanthanum manganite (La1-xMnO3-delta) thin film on st
rontium titanate (SrTiO3) substrate fabricated by liquid chemical vapour de
position has been studied by transmission electron microscopy. Both La1-xMn
O3-delta and SrTiO3 have a perovskite structure with lattice misfit about 1
% but there is no evidence for correlation of the density of the misfit dis
location and misfit. In the vicinity of the interface between La1-xMnO3-del
ta and SrTiO3, the misfit is accommodated by a distortion of the lattice of
La1-xMnO3-delta. At the areas not adjacent to the interface of La1-xMnO3-d
elta-SrTiO3, small particles, which can be identified as MnO, are found to
be associated with the misfit between La1-xMnO3-delta and SrTiO3. The MnO p
hase is unstable with respect to La1-xMnO3-delta. The growth of a thin film
of La1-xMnO3-delta on SrTiO3 is epitaxial and an orientation relationship
is (100)La1-xMnO3-delta//(100)SrTiO3//(100)(MnO) and [010]La1-xMnO3-delta//
[010]SrTiO3//[010](MnO). The Interface of La1-xMnO3-delta-SrTiO3 is compose
d of Ti and Mn atoms plus oxygen.