1992
DOI: 10.1557/jmr.1992.2791
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Natural-abundance 13C dynamic nuclear polarization experiments on chemical vapor deposited diamond film

Abstract: 13C cross-polarization (CP) and direct-polarization (DP) spectra of an 83 mg sample of a chemical vapor deposited (CVD) diamond film (combined from 12 separate depositions) have been obtained via dynamic nuclear polarization (DNP) combined with magic-angle spinning (MAS). With DNP, the presence of unpaired electron spins in the sample, measured to be 2 × 1018 spins/g, provides a way to enhance the 13C or the “residual” 1H signal by irradiating the sample with microwaves at or near the electron spin resonance (… Show more

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Cited by 30 publications
(20 citation statements)
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“…One of Semiconducting diamond Natural 4 hours (5) the most interesting features in the 99% 13 C-enriched diaDiamond film Natural 70 s (6) Diamond film 50% 17 s (6) mond is that the enhanced atomic mass means a reduced Diamond film 100% 8 s (6) lattice parameter (21), which leads to slightly enhanced elas-CVD diamond film Natural 55 s (7) tic constants (24) (elastic moduli deduced from the Brillouin CVD diamond film Natural 1000 s (8) shifts experienced by inelastically scattered monochromatic CVD diamond film 14% 22 s (8) radiation are approximately 0.5% higher than the correDifferent CVD diamond films 22% 1-20 s (9) sponding values for a natural diamond). The conclusion from this result is that such a diamond is the hardest material known.…”
Section: Spin-lattice Relaxation Times In Diamondsmentioning
confidence: 99%
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“…One of Semiconducting diamond Natural 4 hours (5) the most interesting features in the 99% 13 C-enriched diaDiamond film Natural 70 s (6) Diamond film 50% 17 s (6) mond is that the enhanced atomic mass means a reduced Diamond film 100% 8 s (6) lattice parameter (21), which leads to slightly enhanced elas-CVD diamond film Natural 55 s (7) tic constants (24) (elastic moduli deduced from the Brillouin CVD diamond film Natural 1000 s (8) shifts experienced by inelastically scattered monochromatic CVD diamond film 14% 22 s (8) radiation are approximately 0.5% higher than the correDifferent CVD diamond films 22% 1-20 s (9) sponding values for a natural diamond). The conclusion from this result is that such a diamond is the hardest material known.…”
Section: Spin-lattice Relaxation Times In Diamondsmentioning
confidence: 99%
“…By using the DNP (dynamic nuclear polarization) NMR experiment the same t 1/2 magnetization This paper represents a full investigation of the 13 C spinlattice relaxation mechanism in single crystal 99% 13 C-enrecovery behavior has been found in natural and synthetic diamonds, as well as in 13 C natural abundant and 14% 13 C-riched diamonds. The experimental behavior of 13 C spinlattice relaxation times as a function of crystal orientation, enriched diamond films (3,4,7,8).…”
Section: Spin-lattice Relaxation Times In Diamondsmentioning
confidence: 99%
See 1 more Smart Citation
“…It indicates that the sp2-bonded carbon is absent or, if present, is below the detection limit of our instrument. The DNP enhancement factor E is one of the characteristics in the DNP experiment defined as E = (P~-~o)/Pt0, where Pt and P~0 ate nuclear polarization at thermal equilibrium with and without microwave irradiation, respectively [9]. Another normal ~3C NMR signal without DNP enhancement was measured, recorded b.y accumulations (number of scans, 256).…”
Section: Resultsmentioning
confidence: 99%
“…The value of x indicates that the precession of 13C relaxation in synthetic diamond is almost the complete spin diffusion limit. The 13C spin-lattice relaxation time of DSY-2 is shorter than that of natural diamond [10], but is longer than that of diamond film [16,17]. It may be the influence of Fe-Co catalyst inclusion or the existence of spin diffusion.…”
Section: Pi0mentioning
confidence: 99%