Preparation of Perovskite-type LaFeO3 by Thermal Decomposition of Heteronuclear Complex, {La[Fe(CN)6]·5H2O}x

Abstract

Submicron perovskite-type, LaFeO3, powders were prepared by the thermal decomposition of a title cyanide-bridged heteronuclear complex. The decomposition begins at about 50 °C and the formation of LaFeO3 proceeds above 580 °C. Mean particle diameter and specific surface area were 50 nm and 22.7 m2/g, respectively, for the LaFeO3 obtained by calcining at 620 °C.

SYNTHESIS OF Pb2Fe2O5 BY THERMAL DECOMPOSITION OF Pb2[Fe(CN)6].4H2O

“…ABO 3-δ perovskite type oxides (0 £ δ £ 0.5, A= Lanthanide or alkaline earth, B= transition metal) have a great technological interest due to their electrical, magnetic and catalytic properties. They have been extensively used as catalyst in redox reactions, as in the reduction of nitrogen oxides and SO 2 , hydrogenation of hydrocarbons and in the elimination of atmospheric pollution. In the specific case of A=lanthanum, its oxides are particular suitable for applications as a material for sensors, for the detection of vapors and gases such as humidity, alcohol, oxygen, hydrocarbons, CO and NO 2 3-5 .…”

Surface study of fine MgFe2O4 ferrite powder prepared by chemical methods

“…The synthesis using chemical processing methods is performed at considerably lower temperatures than that by the solid-state reaction methods, and finer polymetallic-type products are obtainable [11]. We have been investigating the preparation of a wide range of perovskite-type oxides by the thermal decomposition of the appropriate heteronuclear complexes [12][13][14][15][16]. It is well known that a number of perovskite-type oxides prepared in air display p-type semiconducting properties, and their conductivity increases with the adsorption of oxidizing gases, such as O 2 and NO 2 [17][18][19][20].…”

Extraordinary dissolution of coordination polymer, La[Fe(CN)6] · 5H2O, in ethylene glycol/water mixed solvent and structural determination of dissolved species

“…From this viewpoint, we have investigated the thermal decomposition behavior of cyanide-bridged 3d-4f heteronuclear coordination polymers, Ln[M(CN) 6 ] Á 5H 2 O (Ln = lanthanide(III), M = Fe(III) or Co(III)), and shown that these coordination polymers are excellent precursors of perovskite-type oxides, LnMO 3 [1][2][3]. Nevertheless, there has been an inevitable problem: these coordination polymers are poorly soluble in water and almost insoluble in usual organic solvents, since an extremely sturdy three-dimensional infinite network structure is constructed by the 3d-CN-4f linkages, and hence thermal decomposition process via such solid precursors is the only method for the design of functional materials consisting of perovskite-type oxides.…”

“…The coordination polymer, La[Fe(CN) 6 ] Á 5H 2 O, was synthesized, in the usual way, by mixing the equimolar amounts of La(NO 3 ) 3 Á 6H 2 O and K 3 [Fe(CN) 6 ] in water [1]. Amounts (g) of La[Fe(CN) 6 ] Á 5H 2 O soluble in the mixed solvent (1 ml) of EG and water with various volume ratios were determined at ambient temperature ( Fig.…”