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Preparation and Characterization of Perovskite Oxides by Polymerization-Combustion

“…However, the associated problems with low surface areas, loss of composition by volatilization of chromium and strontium species due to the effect of prolonged times of calcination [7], has enabled the development of alternative synthesis methods at low temperatures, which facilitate the obtention of materials that preserving and improving most of its textural, morphological and electrical properties [8,9]. In this context, this paper describes the preparation of La 0.75 Sr 0.25 Cr 0.2 Fe 0.8 O 3 system, through polymerization-combustion process that promotes the obtention of coordination compounds in aqueous medium, under controlled conditions of pH and temperature, which when exposed to temperatures above 250 °C and oxidizing atmospheres to propitiate a spontaneous combustion process for obtention of solid oxides, this fact, decrease the synthesis temperature and prevents the potential volatilization of species, facilitating the modulation in the final concentration of ceramic as well as the preservation of a series of surface and textural properties of high interest in the field of SOFC components.…”

Preparation of nanosized barium zirconate powder by thermal decomposition of urea in an aqueous solution containing barium and zirconium, and by calcination of the precipitate

“…To avoid these effects, different synthesis methods have been developed like the citrate route, the oxalate route 3,4 or the metal -chelate sol-gel route using ethylene glycol as complexing agent. 5,6 In all these methods, the powder is obtained after a low temperature calcination (< 1000 C) of the precursor. Recently, barium zirconate has been produced by a co-precipitation in presence of ammonia and ammonium carbonate in order to precipitate quantitatively barium and to obtain after calcination a stoechiometric barium zirconate product.…”

A General Soft‐Chemistry Route to Perovskites and Related Materials: Synthesis of BaTiO3, BaZrO3, and LiNbO3 Nanoparticles

“…Sol-gel methods based on the hydrolysis of metal alkoxides have attracted much attention. [2,3] However, the development of soft-chemistry routes for the synthesis of perovskite nanocrystals only started a few years ago. Most preparations of BaTiO 3 use a titanium alkoxide or oxide as titanium source and barium salts such as barium halides, acetates, nitrates, or hydroxides.…”