Resumen de Spark plasma sintering of hydrothermally derived ultrafine Ca doped lanthanum chromite powders
J. López Cuevas, P. Pena, K. Yanagisawa, M. A. Pech-Canul, J. C. Rendón Angeles, S. Díaz Torre de la, L.P. Rivas Vázquez
Lanthanum chromite nano-particles, with a composition of La0.9Ca0.1CrO3 and La0.8Ca0.2CrO3, were produced by 1 h of hydrothermal reaction at 400 and 425¿¿C respectively. The sintering of the powders was conducted using a spark plasma apparatus over the temperature range 1300-1550oC for 1 min with a constant loading pressure of 45 MPa. Additional sintering experiments using conventional firing were carried out for comparison. Fully densified (98 % r.d.) lanthanum chromite pellets with fine equiaxial grains 2.3 ¿Êm in size were obtained using the SPS (spark plasma sintering) method. n contrast, a maximum relative density of 97 % was produced using La0.8Ca0.2CrO3 sintered conventionally at 1400oC for 300 min, and the average grain size of the resulting sintered sample was 6 ¿Êm.
