Abstract
Single C3N4 crystals with 1–3 μ in length and 300 nm in cross area was obtained on nickel substrate. The results rule out the uncertainty of the experimental lattice parameters caused by C-Si-N phase when the growth was on silicon. The X-ray diffraction and transmission electron microscopy with selective-area electron diffraction give the lattice constantsa = 0.624 nm andc = 0.236 nm for β-C3N4, and α=0. 638 nm andc = 0.464 8 nm for α-C3N4, which are respectively 2.5% and 1.3% lower than those of the latest first-principle calculations. An N:C ratio of 1.30–1.40 was determined by energy dispersive X-ray. Based on the experimental lattice constants, the bulk modulus of the obtained β-C3N4 are in the region of 425–445 GPa.
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Wang, E., Guo, L. Synthesis and characterization of C3N4 crystal (II). Sci. China Ser. A-Math. 40, 967–970 (1997). https://doi.org/10.1007/BF02878676
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DOI: https://doi.org/10.1007/BF02878676