(Elements & Compounds) a soft silvery-white metallic element of the alkaline earth group. It is used in bearing alloys and compounds used as pigments. Symbol: Ba; atomic no: 56; atomic wt: 137.327; valency: 2; relative density: 3.5; melting pt: 729°C; boiling pt: 1805°C ...
valency/ barium cerium cuprocarbonatesperovskite structurecopper carbonate substitutionThe synthesis and structural study of new perovskite-like barium-cerium cuprocarbonates are reported. These phases, which are prepared by solid state reaction at 910-930 C in air, show a rather poor thermodynamical ...
A mixed-valency copper oxide having a perovskite-derived structure. This oxide is based on the following formula: PbxBaySrzTr1-tCatCu3O8+delta, where Tr is chosen from the rare earth group including yttrium, x is a number included in the half-closed interval ]0.2] preferably higher than 0.1...
A mixed-valency copper oxide having a perovskite-derived structure. This oxide is based on the following formula: PbxBaySrzTr1-tCatCu3O8+未, where Tr is chosen from the rare earth group including yttrium, x is a number included in the half-closed interval ]0.2] preferably higher than 0.1,...
A mixed-valency copper oxide having a perovskite-derived structure. This oxide is based on the following formula: PbxBaySrzTr1-tCatCu3O8+ delta , where Tr is chosen from the rare earth group including yttrium, x is a number included in the half-closed interval ]0.2] preferably higher than ...
The upper limit is approximately given as 9 - δ = 6.95 + y[0.00< y<0.36(2)], i.e., the maximum formal Cu valency remains constant. Hence, oxygen contents well above sever per formula can be achieved, and for such samples the crystal symmetry eventually turns tetragonal, as seen by ...