title: Evolution of the doping regimes in the Al-doped SnO2 nanoparticles prepared by a polymer precursor method.
abstract: In this study, we report on the structural and hyperfine properties of Al-doped SnO2 nanoparticles synthesized by a polymer precursor method. The x-ray diffraction data analysis carried out using the Rietveld refinement method shows the formation of only rutile-type structures in all samples, with decreasing of the mean crystallite size as the Al content. A systematic study of the unit cell, as well as the vicinity of the interstitial position show strong evidence of two doping regimes in the rutile-type structure of SnO2. Below 7.5 mol% doping a dominant substitutional solution of Al(+3) and Sn(4+)-ions is determined. However, the occupation of both substitutional and interstitial sites is determined above 7.5 mol% doping. These findings are in good agreement with theoretical ab initio calculations.
authors: Instituto de Física, Universidade de Brasilia, Brasilia, DF 70910-900, Brazil. Laboratorio de Física Aplicada, Centro de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte, MG 3127-901, Brazil.
authors: F H
authors: FH
authors: Aragón
authors: J A H
authors: JA
authors: Coaquira
authors: L
authors: L
authors: Villegas-Lelovsky
authors: S W
authors: SW
authors: da Silva
authors: D F
authors: DF
authors: Cesar
authors: L C C M
authors: LC
authors: Nagamine
authors: R
authors: R
authors: Cohen
authors: E
authors: E
authors: Menéndez-Proupin
authors: P C
authors: PC
authors: Morais