Observation of magnetic coupling between the nuclei of liquid 3He and the 141Pr nuclei of PrF3 crystalline powder

Egorov, A. V.; Ирисов, Д. С.; Klochkov, A. V.; Savinkov, A. V.; Safiullin, K. R.; Tagirov, M. S.; Tayurskiı̆, D. A.; Yudin, A. N.

doi:10.1134/s0021364007180142

Cited by 9 publications

(3 citation statements)

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“…The possibility of using dielectric Van Vleck paramagnets for dynamic nuclear polarization of 3 He via direct magnetic coupling between Van Vleck ion and 3 He nuclei was suggested earlier [7]. Later on the cross-relaxation between 141 Pr nuclei of PrF 3 crystalline powder and liquid 3 He was observed by authors [8]. Typical dimensions of sample powder particles were tens of micrometers in reported experiments.…”

Section: Introductionmentioning

confidence: 93%

Comments on the cross-relaxation effect between adsorbed 3He and PrF3 nanoparticles

Alakshin

Gazizulin

Gazizulina

et al. 2015

Low Temperature Physics

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Section: Introductionmentioning

confidence: 93%

Comments on the cross-relaxation effect between adsorbed 3He and PrF3 nanoparticles

Alakshin

Gazizulin

Gazizulina

et al. 2015

Low Temperature Physics

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“…The resonance magnetic coupling between liquid 3 He nuclei and the 141 Pr nuclei in microsized (45 µm) van Vleck paramagnet PrF 3 powder has been discovered by authors [1].…”

Section: Introductionmentioning

confidence: 96%

Development of various methods for PrF3 nanoparticles synthesis

Alakshin¹,

Gabidullin²,

Губайдуллин³

et al. 2011

Preprint

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The six nanosized PrF 3 samples were synthesized using two different chemical reactions and different time of hydrothermal reaction. The X-ray and HRTEM experiments showed high crystallinity of synthesized samples. For all samples the particles size distribution was obtained. It was shown, that precursors of chemical reaction have influence on the shape of synthesized nanoparticles. The size of nanoparticles depended on the time of hydrothermal reaction as much as roughly 10 nm per hour.

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“…18,19 Similar direct dipolar couplings were also observed in liquid 3 He surrounding solid samples. 20,21 In this article we present a new technique that provides detailed information on the magnetic properties of the surface layer of solids and the distribution of paramagnetic impurities in nanodiamonds. It is based on the measurement of relaxation times of adsorbed 3 He distant from the sample surface by variable adsorbed layer thickness of noble or inactive gases.…”

Section: Introductionmentioning

confidence: 99%

Angstrom-scale probing of paramagnetic centers location in nanodiamonds by ³He NMR at low temperatures

Kuzmin

Safiullin

Dolgorukov

et al. 2018

Phys. Chem. Chem. Phys.

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In this article a method to assess the location of paramagnetic centers in nanodiamonds was proposed. The nuclear magnetic relaxation of adsorbed He used as a probe in this method was studied at temperatures of 1.5-4.2 K and magnetic fields of 100-600 mT. A strong influence of the paramagnetic centers of the sample on theHe nuclear spin relaxation time T was found. Preplating the nanodiamond surface with adsorbed nitrogen layers allowed us to vary the distance from He nuclei to paramagnetic centers in a controlled way and to determine their location using a simple model. The observed T minima in temperature dependences are well described within the frame of the suggested model and consistent with the concentration of paramagnetic centers determined by electron paramagnetic resonance. The average distance found from the paramagnetic centers to the nanodiamond surface (0.5 ± 0.1 nm) confirms the well-known statement that paramagnetic centers in this type of nanodiamond are located in the carbon shell. The proposed method can be applied to detailed studies of nano-materials at low temperatures.

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Observation of magnetic coupling between the nuclei of liquid 3He and the 141Pr nuclei of PrF3 crystalline powder

Cited by 9 publications

References 6 publications

Comments on the cross-relaxation effect between adsorbed 3He and PrF3 nanoparticles

Comments on the cross-relaxation effect between adsorbed 3He and PrF3 nanoparticles

Development of various methods for PrF3 nanoparticles synthesis

Angstrom-scale probing of paramagnetic centers location in nanodiamonds by ³He NMR at low temperatures

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Observation of magnetic coupling between the nuclei of liquid 3He and the 141Pr nuclei of PrF3 crystalline powder

Cited by 9 publications

References 6 publications

Comments on the cross-relaxation effect between adsorbed 3He and PrF3 nanoparticles

Comments on the cross-relaxation effect between adsorbed 3He and PrF3 nanoparticles

Development of various methods for PrF3 nanoparticles synthesis

Angstrom-scale probing of paramagnetic centers location in nanodiamonds by 3He NMR at low temperatures

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Product

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Angstrom-scale probing of paramagnetic centers location in nanodiamonds by ³He NMR at low temperatures