Elsevier

Physica C: Superconductivity

Volume 190, Issue 4, 15 January 1992, Pages 597-605
Physica C: Superconductivity

Crystal structures of stage-n iodine-intercalated compounds IBi2nSr2nCanCu2nOx

https://doi.org/10.1016/0921-4534(92)90722-OGet rights and content

Abstract

The crystal structure of stage-3 iodine-intercalated superconducting IBi6Sr6Ca3Cu6Ox has been determined by transmission electron microscopy to belong to the space group Pma2 with lattice parameters a=5.4Å, b=5.4Å and c=49.4Å. Ioidine atoms intercalated between every three BiO bilayers expand the distance between the BiO layers by 3.6Å and alter the atomic stacking across BiO layers from the staggered configuration characteristic of host superconducting Bi2Sr2CaCu2Ox to an aligned configuration characteristic of stage-1 iodine-intercalated superconducting IBi2Sr2CaCu2Ox. Higher-stage intercalation has also been observed as stacking faults which predominantly contain both stage-2 and stage-3 phases. The space groups and c-axis dimensions of the higher-stage phases have been deduced to be Pma2 with c=3.6+15.3n Å when stage number n is odd, and Bbmb with c=2(3.6+15.3n) Å when n is even.

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