Abstract
The existence of materials of the type (Ln,Ce) 2Sr 2Cu 3O 8+x (Ln=lanthanide, Y), analogies of the unstable YSr 2Cu 3O 7−x 2 with yttrium replaced by a fluorite block, (Ln,Ce) 2O 2, have yet to confirmed by detailed structural studies. Reported here are the results of an investigation into their formation and structure which indicate the partial substitution of copper on the “Cu1” sites by cerium to be necessary to stabilise the YBCO-type strucure.
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