On the nuclear magnetic resonance in metals and alloys

Bloembergen, N.; Rowland, T. J.

doi:10.1016/0001-6160(53)90033-9

Cited by 475 publications

(71 citation statements)

References 22 publications

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“…Other examples of negative shifts in diamagnetic, non-d materials are TI in NaTl [9,[94][95][96] and In in BiIn ' at 77 K [97]. For these cases the situation is much less clear due to the lack of data for xp, m*, and y.…”

Section: Orbital Magnetism In Simple Metalsmentioning

confidence: 99%

Relevance of knight shift measurements to the electronic density of states

Bennett

Watson

Carter

1970

J. RES. NATL. BUR. STAN. SECT. A.

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The Knight shift, % , measures th e magne ti c hype rfin e fi eld at th e nucleu s produ ced by th e conducti on e lec tro ns whi c h are po la ri ze d in a ma gne ti c fi e ld. Kni ght s hifts are ofte n dominated by th e Pauli term a nd , in it.s mo st s impl e form , can be writte n as % = (a) x p. H ere XP is the conduction electron Pauli s pin s usce ptibility whic h de pe nd s on th e de nsity of states at th e Fe rmi le vel, N(EF), and (a ) is an a ve rage magneti c hype rfin e couplin g' cons tant associated with th e wav e function characte r at the nu c le us, 1

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Section: Orbital Magnetism In Simple Metalsmentioning

confidence: 99%

Relevance of knight shift measurements to the electronic density of states

Bennett

Watson

Carter

1970

J. RES. NATL. BUR. STAN. SECT. A.

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“…The calculation of the powder lineshape in the presence of quadrupolar and chemical shift anisotropy interactions has been considered by a number of authors (4)(5)(6)(7)(8). The problem becomes progressively more complex when both types of interaction are considered and when the molecule has non-axial symmetry.…”

Section: Introductionmentioning

confidence: 99%

The ⁵⁹Co nuclear magnetic resonance spectra of polycrystalline complexes

Eaton¹,

Buist²,

Sayer³

1987

Can. J. Chem.

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, 1332 (1987). The solid state 5 9~o nmr spectra of a number of octahedral complexes are reported. In the case of sodium hexanitrocobaltate(II1) the spectra have been obtained at several different field strengths and the results are analysed to give a quadrupole coupling constant of 9.4 MHz, an asymmetry parameter of zero and an axial chemical shift tensor with an anisotropy of 180 ppm. Several other complexes have been examined at high field (1 1.8T) to minimize the effects of quadrupole coupling and maximize the influence of chemical shift anisotropy. The results are, where possible, compared with single crystal X-ray and low field nmr data. It is concluded that high fields are necessary to obtain reliable chemical shift anisotropy values. The conditions necessary for obtaining reasonable quality spectra from polycrystalline samples containing quadrupolar nuclei are discussed.

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“…This approach was appropriate for most early studies, where there was interest in measuring the Knight shifts and relaxation times of metal nuclei in order to probe the hyperfine interactions and gain insight into the electronic structure of metals [2,3,4,5,6]. Indeed, there have been successful studies on powdered metals, both pure [4,7,8,9,10,11] and alloyed [10,12,13,14,15]. Powdered metal conductors were also amongst the first samples proposed for dynamic nuclear polarization (DNP) transfer experiments [16].…”

Section: Introductionmentioning

confidence: 99%

Visualizing skin effects in conductors with MRI: 7Li MRI experiments and calculations

Ilott

Chandrashekar

Klöckner

et al. 2014

Journal of Magnetic Resonance

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While experiments on metals have been performed since the early days of NMR (and DNP), the use of bulk metal is normally avoided. Instead, often powders have been used in combination with low fields, so that skin depth effects could be neglected. Another complicating factor of acquiring NMR spectra or MRI images of bulk metal is the strong signal dependence on the orientation between the sample and the radio frequency (RF) coil, leading to non-intuitive image distortions and inaccurate quantification. Such factors are particularly important for NMR and MRI of batteries and other electrochemical devices. Here, we show results from a systematic study combining RF field calculations with experimental MRI of 7 Li metal to visualize skindepth effects directly and to analyze the RF field orientation effect on MRI of bulk metal. It is shown that a certain degree of selectivity can be achieved for particular faces of the metal, simply based on the orientation of the sample. By combining RF field calculations with bulk magnetic susceptibility calculations accurate NMR spectra can be obtained from first principles. Such analyses will become valuable in many applications involving battery systems, but also metals, in general.

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On the nuclear magnetic resonance in metals and alloys

Cited by 475 publications

References 22 publications

Relevance of knight shift measurements to the electronic density of states

Relevance of knight shift measurements to the electronic density of states

The ⁵⁹Co nuclear magnetic resonance spectra of polycrystalline complexes

Visualizing skin effects in conductors with MRI: 7Li MRI experiments and calculations

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On the nuclear magnetic resonance in metals and alloys

Cited by 475 publications

References 22 publications

Relevance of knight shift measurements to the electronic density of states

Relevance of knight shift measurements to the electronic density of states

The 59Co nuclear magnetic resonance spectra of polycrystalline complexes

Visualizing skin effects in conductors with MRI: 7Li MRI experiments and calculations

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The ⁵⁹Co nuclear magnetic resonance spectra of polycrystalline complexes