Observation of single-crystal diamond growth in thin films obtained from the rf decomposition of a CH4/Ar plasma is reported. The films were deposited on Si substrates which were kept at 20 °C. Polycrystalline diamond grains are seen over the entire film. Single-crystal diffraction patterns obtained from larger grains all show {111} twinning.
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Amaratunga et al. (1989) studied this question.
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