BCZYx samples were prepared by a modified version of citrate-nitrate combustion synthesis with subsequent decomposition. Of organometallic complexes at high temperatures.Prior to, the synthesis the starting materials (Ba (NO3), 2 Ce (NO3), 3 $6H2O Y (NO3) 3 $6H2O CuO Co3O4 and citric,,,, acid with Purity no less than 99.5%),Were thoroughly mixed and dissolved afterward in a solution containing stoichiometric required amounts of zirconium oxynitrate. And glycerin.Citric acid and glycerin were chosen as chelating and complexing agents with the appropriate molar ratio to metal nitrates. (0.5: 1.5:, 1 respectively).The as-obtained solutions were heated and stirred at 100 C for 0.5 h.With subsequent addition of ammonium hydroxide to ensure pH at the level of 8e9.The final solution was again heated at 250 C to evaporate the excess water.And assist in foaming of a viscous gel which was, eventually autoignited.The obtained gray (for low Zr content) or black (for high Zr content).Powders were subsequently fired at 700 C (1 h) in air to remove, organic residueAnd then the light-colored ones were calcined at 1150 C (5 h).To form single-phase products. The powders were milled in a planetary mill.(Fritsch Pulverisette 6) for 1 h at, 250 rpmUniaxially pressed into thepellets under 4 ton cm2 and then sintered at 1450 C for 5 h.
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