Oxygen vacancies doping effect on the electrical and magnetic behavior of Ba5-xLaxNb4-xTixO15

J. M. DE PAOLI; R. E. CARBONIO; R. D. S¨¢NCHEZ

Elsevier

Año: 2007 vol. 68 p. 124 - 124

p class="MsoNormal" style="text-align: justify; line-height: 200%; margin: 0cm 0cm 0pt;">We report electric and magnetic properties of oxygen deficient Ba5-xLaxNb4-xTixO15-d phases, which have been prepared by solid state reaction method followed by a controlled reduction process under hydrogen atmosphere. The extra electrons added by the formation of the oxygen vacancies (d) introduce localized spins and the magnetic susceptibility can be described by a temperature independent contribution and a Curie-Weiss term associated to the Ti3+ ion formation. Besides, the experimental resistivity (r) data of these four reduced compounds are well described in a wide temperature range with the equation r