Synthesis of LaCrO3 at Low Temperature by the Poly(vinyl alcohol) Gel Combustion Method

Abstract

LaCrO₃ perovskite has been synthesized by the combustion of gel prepared from poly(vinyl alcohol) and metal nitrates at low temperature (700 ºC). LaCrO₃ was characterized by X-ray diffraction, thermogravimetric and differential thermal analysis, field emission scanning electron microscopy and brunaure-emmet-teller surface area. The optional preparative conditions were polyvinyl alcohol/metals 3:1 by mol, pH = 3-4 and 80 ºC for gel formation. The specific surface area of LaCrO₃ nanopowders was 14.1 m²/g and average partial size was 60-70 nm.