Abstract
The crystal structure of the Ho-Ba-Cu oxide, which is responsible for high T c superconductivity, has been investigated by transmission electron microscopy. The lattice belongs to an orthorhombic system with lattice parameters a=3.83 Å, b=3.90 Å and c=11.8 Å. It is an isomorphous structure of the high-T c superconductor Y-Ba-Cu oxide. Micro twinning of crystal is observed under the high spatial resolution, that is 3 Å. The twinned crystals could be observed with incident electron beam parallel to a, b and c-axes of the crystal. It is concluded that the Cu layers expand in the a-b planes even across the twin boundary without any kink.

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