Correlation of ‘‘twins’’ observed by optical microscopy and transmission electron microscopy in YBa2Cu3O7−x superconductors

22 February 1988

journal article
research article
Published by AIP Publishing in Applied Physics Letters

Vol. 52 (8) , 669-671
https://doi.org/10.1063/1.99370

Abstract

By using transmission electron microscopy and optical microscopy on the same specimens, the patterns of light- and dark-contrast lines seen in reflected polarized light were shown to be an interference pattern due to the variable spacing of suboptical microtwins. These microtwins are mostly [110] reflection twins. The [110] twinning was observed to be cyclic and occasionally pseudotetragonal because of the progressive cycling of contact twin domains. Within a domain, and occasionally in a whole grain, the [110] reflection twins occurred as polysynthetic lamellae. The morphology of the domain structure can be explained from the theory of martensitic transformation.

Keywords

This publication has 3 references indexed in Scilit:

Domainlike defects observed in the high-temperature superconductor Y-Ba-Cu-O
Physical Review B, 1987
Electron diffraction and electron microscopic study of BaYCuO superconducting materials
Solid State Communications, 1987
Twinned crystals
Advances in Physics, 1954