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TEM Study of (015) Growth Twins in The Bi-Sr-Ca-Cu-O Superconductors Obtained by Melt Quench Technique

  • Ohnishi N (a1), Sankararaman M (a1) and Sato H (a1)


A new type of twin structure is found to exist quite commonly in the Bi2Sr2CaCu2O8+δ superconductor obtained by annealing melt quenched amorphous precursors. From transmission electron microscopy and electron diffraction, the twinning plane is determined to be the (015) plane (disregarding the period of incommensurate modulation in the b-direction). Further, the twin boundary is found to be coherent with a specific coincidence condition. The analysis of the morphologies indicates that the twins nucleate at the early stages of the grain growth in these materials.



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