Year: 2010
Type: article
Abstract: Thin LaNiO 3- films with pseudocubic (100) preferred orientation were prepared by reactive DC magnetron sputtering and in situ annealed in O2 and vacuum. X-ray photoelectron spectroscopy (XPS) was used to determine the variation in composition of the films under high temperature annealing. The experimental O 1s and La 3d -Ni 2p 3/2 spectra of LaNiO 3- films was analysed in terms of O 2-, O -/(OH) -, and weakly adsorbed oxygen species. It was shown that the change in the type of conductivity from metallic to semiconducting one is accompanied by a marked increase in the intensity of the lateral (531 eV) peak of oxygen. The quantitative analyses of La 3d -Ni 2p 3/2 spectra show that the Ni/La concentration ratio significantly decreases after heating above the dehydration temperature. These variations in conductivity and surface composition were attributed to the loss of lattice oxygen with subsequent adsorption of O -and (OH) -anions and weakly adsorbed oxygen species from ambient air.
Source: Lithuanian Journal of Physics
Authors: Sigitas Mickevičius, S. Grebinskij, V. Bondarenka, H. Tvardauskas, M. Senulis, V. Lisauskas, K. Šliužienė, B. Vengalis, B. A. Orlowski, E. Baškys
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2083203308