Title :
Nanoparticles of La/sub 1-x/Sr/sub x/MnO/sub 3/ compounds
Author :
Marques, R.F.C. ; Jafelicci, M.Jr. ; Paiva-Santos, C.O. ; Jardim, R.F. ; Souza, J.A. ; Varanda, L.C. ; Godol, R.H.M.
Abstract :
Summary form only given. Lanthanum strontium doped manganites have attracted renewed attention at present due to the observation of interesting electrical and magnetic properties such as a colossal negative magnetoresistance, catalytic activity, field-sensing, among others. Several preparation methods are described in the literature concerning the so-called wet-chemical routes. This work describes a nanoparticle La/sub 1-x/Sr/sub x/MnO/sub 3/ (x = 0.1, 0.2 and 0.3) synthesis by the homogenous coprecipitation method using urea as precipitant agent. The samples were characterized by X-ray powder diffraction, transmission electron microscopy (TEM) and electrical resistivity as a function of temperature.
Keywords :
X-ray diffraction; electrical resistivity; ferromagnetic materials; lanthanum compounds; materials preparation; metal-insulator transition; nanoparticles; precipitation (physical chemistry); strontium compounds; transmission electron microscopy; LaSrMnO/sub 3/; TEM; X-ray powder diffraction; catalytic activity; colossal negative magnetoresistance; coprecipitation method; electrical resistivity; field-sensing; lanthanum strontium doped manganites; metal-insulator transition; nanoparticle synthesis; temperature effect; transmission electron microscopy; urea; Colossal magnetoresistance; Electric resistance; Lanthanum; Magnetic properties; Nanoparticles; Powders; Strontium; Temperature; Transmission electron microscopy; X-ray diffraction;
Conference_Titel :
Magnetics Conference, 2002. INTERMAG Europe 2002. Digest of Technical Papers. 2002 IEEE International
Conference_Location :
Amsterdam, The Netherlands
Print_ISBN :
0-7803-7365-0
DOI :
10.1109/INTMAG.2002.1001326
