High-spin defect centers in crystal matrices are used in quantum computing technologies, highly sensitive sensors, and single-photon sources. In this work, optically active nitrogen-vacancy color centers NV– in a 28Si-enriched (nuclear spin \(I = 0\) ) 6H-28SiC crystal have been studied using the photoinduced ( \(\lambda \) = 980 nm) high-frequency (94 GHz, 3.4 T) pulsed electron paramagnetic resonance method at a temperature of \(T = 150{\kern 1pt} \) K. Three structurally nonequivalent types of NV– centers with axial symmetry have been identified and their spectroscopic parameters have been determined. Long spin–lattice, \({{T}_{1}} = 1.3{\kern 1pt} \) ms, and spin–spin, \({{T}_{2}} = 59{\kern 1pt} \) μs, ensemble relaxation times of NV– centers with extremely narrow (450 kHz) absorption lines allow highly selective excitation of resonant transitions between sublevels \(({{m}_{I}})\) caused by the weak hyperfine interaction \((A \approx 1{\kern 1pt} \) MHz) with 14N \((I = 1)\) nuclei for the quantum manipulation of the electron spin magnetization.
