Antiphase boundaries in GaAs have been produced by growing the GaAs on {001} Ge substrates. The GaAs was grown by the technique of organometallic vapor phase epitaxy to a thickness in excess of 1 μm. The antiphase boundaries are shown to be faceted with facets parallel to the {110} planes being particularly common. The rigid-body translation at the different facet planes is shown to be small for the {110} planes but it can be large for other facet planes.

Bicrystals of gallium arsenide have been grown by the technique of organometallic, vapor phase epitaxy on substrates cut from Czochralski-grown germanium bicrystals. Both 〈110〉 and 〈001〉 tilt boundaries have been grown. Experimental illustrations of the Σ=3 and Σ=5 grain boundaries are presented. The grain boundaries tend to facet along well-defined planes but closely reproduce the misorientation of the seed bicrystal.