Abstract
The lattice constants of diamond crystals consisting of an isotopic mixture of were measured as a function of the isotopic composition by single-crystal diffractometry using the synchrotron x-ray radiation. The isotope ratio of the synthesized diamond samples was determined by secondary-ion-mass spectroscopy. The lattice constant can be expressed in quadratic form as a(X) =3.567 12-9.0×X+3.7×, where X=C]/(C]+C]), in contrast to the linear relation reported by Holloway, Hass, and Tamor [Phys. Rev. B 45, 6353 (1992)], namely a(X)=3.567 14-5.4×X.
- Received 13 December 1993
DOI:https://doi.org/10.1103/PhysRevB.49.9341
©1994 American Physical Society