SciELO - Scientific Electronic Library Online

vol.6 issue2Cracking susceptibility of aluminum alloys during laser weldingComputational modeling of ring textures in mesophase carbon fibers author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Materials Research

Print version ISSN 1516-1439On-line version ISSN 1980-5373


ORLANDI, Marcelo O.; BUENO, Paulo Roberto; LEITE, Edson Roberto  and  LONGO, Elson. Nonohmic behavior of SnO2.MnO2-based ceramics. Mat. Res. [online]. 2003, vol.6, n.2, pp.279-283. ISSN 1516-1439.

The present paper describes the nonohmic behavior of the SnO2.MnO-based system and analyzes the influence of the sintering time and the Nb2O5 concentration on this system's electrical properties. A nonlinear coefficient of ~7 was obtained for a 0.2 mol%-doped Nb2O5 composition, which is comparable to other values reported in the literature for the ternary SnO2-based systems. A recent barrier formation model proposed in the literature to explain the nonlinear electrical behavior of SnO2-based systems is used to clarify the role of the MnO constituent in the formation of the barrier, taking into account the influence of segregated atoms, precipitated phase and oxygen species in the grain boundary region.

Keywords : SnO2; varistor; semiconductor.

        · text in English     · English ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License