A complex stacking-fault structure was revealed in a flux-grown BeO crystal, with X-ray topographic images as well as characteristic interference fringes around the stacking-fault image. Coplanar with the stacking fault are a number of dislocations of various (unidentified) Burgers vectors, all probably having a common origin during crystal growth.The crystal structure of ~-beryilia is hexagonal closestpacked (wurtzite type) at room temperature. The hightemperature form (fl-beryllia) is tetragonal (Smith, Cline & Austerman, 1965). Evidence for the presence ofacubic form has not been reported. Therefore, the stackingfault energy for BeO seems to be high and stacking faults ha,re not been found in BeO crystals. The purpose of the present note is to give evidence of stacking faults in ~-beryllia.The stacking faults were observed by X-ray diffraction topography. The crystal studied was grown from LizMoO4-MoO3 (Austerman, 1964)
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