Bismuth-lead strontium calcium copper oxide

Other superconducting materials deposited by the sol-gel process using metal alkoxide precursors are the 1,2,4 compound YBazCu408, bismuth strontium calcium copper oxides, bismuth lead strontium calcium copper oxide, and thallium... 

Bismuth trioxide forms numerous, complex, mixed oxides of varying composition when fused with CaO, SrO, BaO, and PbO. If high purity bismuth, lead, and copper oxides and strontium and calcium carbonates are mixed together with metal ratios Bi Pb Sn Ca Cu = 1.9 0.4 2 2 3 or 1.95 0.6 2 2 3 and calcined at 800—835°C, the resulting materials have the nominal composition Bi PbQ4Sr2Ca2Cu20 and Bi 25PbQgSr2Ca2Cu20 and become superconducting at about 110 K (25). 

Bismuth oxide forms a number of complex mixed-metal phases with the divalent metal oxides of calcium, strontium, barium, lead, and cadmium, and these show a wide variety in composition. With transition metal oxides, mixed-metal oxide phases have been observed which are based upon a Perovskite-type lattice (10) containing layers of Bi202. It is notable that the high Tc superconducting materials which include bismuth also have this Perovskite-type of lattice with layers of copper oxide interleaved with bismuth oxide layers. 

P 5l,95.2,iBa4BiO 2Tlo,9. 05. Barium bismuth lead thallium oxide (Ba4BiPbi95.2, Tlo.9.i,o50i2). [133494-87-8], 30 208 Pb2Cao,5Cu308Sr2Yo,5. Calcium copper lead strontium yttrium oxide (Cao.sCu3Pb2Sr2Yo.5O8). [118557-22-5], 30 197... 

Heating with the following solids, their fusions, or vapours (a) oxides, peroxides, hydroxides, nitrates, nitrites, sulphides, cyanides, hexacyano-ferrate(III), and hexacyanoferrate(II) of the alkali and alkaline-earth metals (except oxides and hydroxides of calcium and strontium) (b) molten lead, silver, copper, zinc, bismuth, tin, or gold, or mixtures which form these metals upon reduction (c) phosphorus, arsenic, antimony, or silicon, or mixtures which form these elements upon reduction, particularly phosphates, arsenates,... 

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