Abstract
The relationship between the ferroelastic domain distribution within orthorhombic YBa 2Cu 3O 7- x single crystals and the characteristic pattern of bright-dark striations that can be seen on the surface of such crystals by means of polarization microscopy is examined by comparison of micrographs obtained from electron and optical microscopy respectively. By calculating the birefringence pattern caused by a given distribution of twin boundaries, it is shown how the optical pattern can be explained by taking into account the resolvable optical anisotropy that depends on the resolution of the microscope lens as well as on the actual twin configuration. It is discussed what kind of information about the domain distribution can be obtained by means of optical microscopy.
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