Rs. Swineford et al., STRUCTURE OF C-STABILIZED FCC FE ON DIAMOND - EPITAXIAL-GROWTH OF AUSTENITE, Physical review. B, Condensed matter, 52(11), 1995, pp. 7890-7893
Fe films were grown on single-crystal diamond substrates and the struc
ture and chemistry of the Fe near neighbor environment was studied. It
was observed that the Fe is in a metastable fee structure after a 350
degrees anneal, and a compression of the lattice in the plane of the
surface of 1 +/- 0.6% was obtained by comparing low-energy electron di
ffraction and extended x-ray absorption fine-structure results. Auger-
electron spectroscopy shows that C begins diffusing into the fee Fe la
ttice at approximately 200 degrees C. It was observed that the C signa
l saturates at the equivalent of 1 atom/unit cell in the Fe film, and
that the C atoms reside in the octahedral site, as expected for an aus
tenite structure.