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Combustion synthesis of YBa2Cu3O7?x: glycine/metal nitrate method

Author:
L.R. Pederson   G.D. Maupin   W.J. Weber   D.J. McReady   R.W. Stephens  


Journal:
Materials Letters


Issue Date:
1991


Abstract(summary):

A combustion synthesis method has been developed to simply and rapidly prepare YBa 2Cu 3O 7-x and YBa 2Cu 3O 7-x/Ag from an aqueous solution of the metal nitrates and glycine. Glycine served both as the fuel for combustion and as a complexant, important to prevent inhomogeneous precipitation of individual components prior to combustion. Ash collected following combustion consisted of well-mixed, soft agglomerates of barium carbonate, yttrium oxide, cupric oxide, and/or copper metal, depending on the ratio of fuel to oxidant. This mixture was calcined at 900degC for 4 h to convert the product to YBa 2 Cu 3O 7-x. Samples sintered at 950degC for 8 h and annealed in oxygen at 450degC for a like time showed a Tc (midpoint) of 92.5 K with a width of 1.4 K and a high degree of phase-purity. This synthesis method is well suited to the preparation of a wide variety of multicomponent ceramics


Page:
437-443


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