INVESTIGADORES
BOTTA pablo Martin
artículos
Título:
Dielectric behavior of La1-xCaxMnO3 0.4 < x < 0.5
Autor/es:
PABLO M. BOTTA; JORGE MIRA; ALFONSO FONDADO; JOSÉ RIVAS
Revista:
BOLETíN DE LA SOCIEDAD ESPAñOLA DE CERáMICA Y VIDRIO
Referencias:
Año: 2006 vol. 45 p. 163 - 168
ISSN:
0366-3175
Resumen:
In this work the dielectric behavior of semiconducting La-manganites in an intermediate Ca-doping regime is studied. Ceramic samples were prepared by conventional solid-state reaction, using elemental oxides as starting reactants. A chemical, structural and microstructural characterization of the prepared manganites was performed by iodometric titrations, X-ray diffraction and scanning electron microscopy, respectively. The magnetic susceptibility and electrical resistivity as a function of temperature were also measured. The complex dielectric permittivity of the samples was determined as a function of frequency and temperature. Very high values of dielectric constant in a wide frequency and temperature range were observed for all the synthesized samples. Moreover, an increase of the dielectric constant at temperatures close to charge order or metal-insulator transition is reported.