Magnetization and 13C NMR spin-lattice relaxation of nanodiamond powder

Levin, E M; Fang, X W; Bud'ko, S L; Straszheim, W E; McCallum, R W; Schmidt-Rohr, K

doi:10.1103/PhysRevB.77.054418

Title: Magnetization and 13C NMR spin-lattice relaxation of nanodiamond powder

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Abstract

The bulk magnetization at temperatures of 1.8-400 K and in magnetic fields up to 70 kOe, the ambient temperature {sup 13}C NMR spin-lattice relaxation, T{sub 1,c}, and the elemental composition of three nanodiamond powder samples have been studied. The total magnetization of nanodiamond can be explained in terms of contributions from (1) the diamagnetic effect of carbon, (2) the paramagnetic effect of unpaired electrons present in nanodiamond grains, and (3) ferromagnetic-like and (4) superparamagnetic contributions from Fe-containing particles detected in spatially resolved energy-dispersive spectroscopy. Contributions (1) and (2) are intrinsic to nanodiamond, while contributions (3) and (4) arise from impurities naturally present in detonation nanodiamond samples. {sup 13}C NMR T{sub 1,c} relaxation would be unaffected by the presence of the ferromagnetic particles with the bulk magnetization of {approx} 0.01 emu/g at 300 K. Thus, a reduction of T{sub 1,c} by 3 orders of magnitude compared to natural and synthetic microdiamonds confirms the presence of unpaired electrons in the nanodiamond grains. The spin concentration in nanodiamond powder corresponds to {approx}30 unpaired electrons per {approx}4.6 nm diameter nanodiamond grain.

Authors:: Levin, E M; Fang, X W; Bud'ko, S L; Straszheim, W E; McCallum, R W; Schmidt-Rohr, K

Publication Date:: Fri Feb 15 00:00:00 EST 2008

Research Org.:: Ames Lab., Ames, IA (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 962920

Report Number(s):: IS-J 7291
Journal ID: 1098-0121; TRN: US200916%%425

DOE Contract Number:: DE-AC02-07CH11358

Resource Type:: Journal Article

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 77; Journal Issue: 5

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; AMBIENT TEMPERATURE; CARBON; ELECTRONS; EXPLOSIONS; IMPURITIES; MAGNETIC FIELDS; MAGNETIZATION; RELAXATION; SPECTROSCOPY; SPIN; SPIN-LATTICE RELAXATION

Citation Formats


                    Levin, E M, Fang, X W, Bud'ko, S L, Straszheim, W E, McCallum, R W, and Schmidt-Rohr, K. Magnetization and 13C NMR spin-lattice relaxation of nanodiamond powder.  United States: N. p., 2008. 
        Web.  doi:10.1103/PhysRevB.77.054418.

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                    Levin, E M, Fang, X W, Bud'ko, S L, Straszheim, W E, McCallum, R W, & Schmidt-Rohr, K. Magnetization and 13C NMR spin-lattice relaxation of nanodiamond powder.  United States.  https://doi.org/10.1103/PhysRevB.77.054418

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                    Levin, E M, Fang, X W, Bud'ko, S L, Straszheim, W E, McCallum, R W, and Schmidt-Rohr, K. 2008.  
        "Magnetization and 13C NMR spin-lattice relaxation of nanodiamond powder".  United States.  https://doi.org/10.1103/PhysRevB.77.054418.

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@article{osti_962920,

  title        = {Magnetization and 13C NMR spin-lattice relaxation of nanodiamond powder},

  author       = {Levin, E M and Fang, X W and Bud'ko, S L and Straszheim, W E and McCallum, R W and Schmidt-Rohr, K},

  abstractNote = {The bulk magnetization at temperatures of 1.8-400 K and in magnetic fields up to 70 kOe, the ambient temperature {sup 13}C NMR spin-lattice relaxation, T{sub 1,c}, and the elemental composition of three nanodiamond powder samples have been studied. The total magnetization of nanodiamond can be explained in terms of contributions from (1) the diamagnetic effect of carbon, (2) the paramagnetic effect of unpaired electrons present in nanodiamond grains, and (3) ferromagnetic-like and (4) superparamagnetic contributions from Fe-containing particles detected in spatially resolved energy-dispersive spectroscopy. Contributions (1) and (2) are intrinsic to nanodiamond, while contributions (3) and (4) arise from impurities naturally present in detonation nanodiamond samples. {sup 13}C NMR T{sub 1,c} relaxation would be unaffected by the presence of the ferromagnetic particles with the bulk magnetization of {approx} 0.01 emu/g at 300 K. Thus, a reduction of T{sub 1,c} by 3 orders of magnitude compared to natural and synthetic microdiamonds confirms the presence of unpaired electrons in the nanodiamond grains. The spin concentration in nanodiamond powder corresponds to {approx}30 unpaired electrons per {approx}4.6 nm diameter nanodiamond grain.},

  doi          = {10.1103/PhysRevB.77.054418},

  url          = {https://www.osti.gov/biblio/962920},
  journal      = {Physical Review B},
number       = 5,

  volume       = 77,

  place        = {United States},

  year         = {Fri Feb 15 00:00:00 EST 2008},

  month        = {Fri Feb 15 00:00:00 EST 2008}

}

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