Abstract
The new complex oxides R 2Ba 1.33Th 0.67Cu 3O 8+ δ ( R = La, Pr) and La 0.67Ba 1.33 R 2− x Th x Cu 3O 8+ δ ( R = NdGd, x = 0.5, 0.67) were synthesized. These compounds have a similar structure to the Ce-223 high- T c oxides. The oxygen content (or δ) was varied over a wide range after annealing at high oxygen pressure (up to 90 atm). Unit cell parameters and δ values for all the new phases were determined. The resistivities of these semiconducting compounds obey the law ϱ = ϱ o T − α . A single crystal of Nd 2Ba 1.5Th 0.5Cu 3− x Al x O 8+ δ ( x = 0.3, δ = 0.8) was obtained and its structure was determined by X-ray single-crystal experiment (tetragonal system, space group I4 mmm , a = 3.9057(5) Å, c = 28.569(4) Å, Z = 2).
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