Abstract
Polycrystalline BaМe1-xYxO3-δ(Me=Co, Fe) samples were synthesized by a conventional route and glycerol–nitrate technique. According XRD patterns of single phase solid solutions BaCo1-xYxO3-δ (0.1≤x≤0.4) and BaFe0.9-yY0.1CoyO3-δ(0.05≤y≤0.15) were indexed using Pm3m space group. The unit cell parameters were refined using Rietveld full-profile analysis. Oxygen nonstoichiometry of these solid solutions was measured by means of thermogravimetric technique within the temperature range 298–1273 K in air.
Highlights
Compounds with a perovskite structure currently provoke great interest, due to the unique physical and chemical properties
According to XRD, it was revealed that the complex oxides slowly cooled from 1373 K to room temperature in air are single phased
It has been found that administration of yttrium into cobalt or iron sublattice leads to the formation of solid solutions BaMe1–xYxO3–δ (Me = Co, Fe), stabilizing a cubic perovskite structure
Summary
Synthesis of samples for research in system Ba-Me-Me’-Y-O (Me, Me ‘= Co, Fe) was carried out by standard ceramic technology, and mortar method with the use of glycerine as the organic precursor. Under the standard ceramic technology, the mixture of raw materials with defined components ratio was thoroughly grinded and subjected to a graduated exhaust gas after burning, pose aims for optimizing the conditions of their synthesis and complex study of their properties. Further annealing was carried out at a temperature of 1373 K during 60 hours, followed by its cooling the samples to room temperature with the speed 100° per hour. Oxygen non-stoichiometry of complex oxides in the system Ba-Me-Me'-Y-O (Me, Me '= Co, Fe) was studied by hightemperature thermogravimetry as a function of the temperature in the range of 298 ≤ T, K ≤ 1373, at a pressure of Po2 = 0.21 atm, on the machine STA 409 PC. The absolute values of the oxygen nonstoichiometry were determined by direct recovery of samples in hydrogen flow and iodometric titration
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