Microstructures of La_1-xA_x(A = Ca or Sr)MnO_3-δthin films by liquid-delivery metalorganic chemical vapor deposition

摘要

The microstructures of La_1-xA_x(A = Ca or Sr)MnO_3-δthin films grown by liquid-delivery metalorganic chemical vapor deposition on(001)MgO and (110)_pseudo-cubic LaAlO_3 were studied by transmission electron microscopy. The La_1-xCa_xMnO_3-δthin films on large lattice mismatched MgO exhibited very defective Microstructures and consisted of two typical regions. The first region was close to the Film-substrate interface and had an epitaxial relationship to the substrate with many Differently oriented domains nucleated on the substrate surface. The second region Consisted of columnar grains with some degree of texture.