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Title: Studies of energy-relevant materials by nuclear magnetic resonance

Authors:
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1417981
Report Number(s):
IS-T 3211
DOE Contract Number:
DE-AC02-07CH11358
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English

Citation Formats

Cui, Jinfang. Studies of energy-relevant materials by nuclear magnetic resonance. United States: N. p., 2017. Web. doi:10.2172/1417981.
Cui, Jinfang. Studies of energy-relevant materials by nuclear magnetic resonance. United States. doi:10.2172/1417981.
Cui, Jinfang. Sat . "Studies of energy-relevant materials by nuclear magnetic resonance". United States. doi:10.2172/1417981. https://www.osti.gov/servlets/purl/1417981.
@article{osti_1417981,
title = {Studies of energy-relevant materials by nuclear magnetic resonance},
author = {Cui, Jinfang},
abstractNote = {},
doi = {10.2172/1417981},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat May 06 00:00:00 EDT 2017},
month = {Sat May 06 00:00:00 EDT 2017}
}

Thesis/Dissertation:
Other availability
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  • Study of the trapping and stabilization of H-atoms in solids has shown that CaF/sub 2/ can absorb H-atoms from the gas phase, trapping them in nonsuperficial sites. Although long-term room temperature storage of H-atoms in CaF/sub 2/ was achieved, the inaccessibility of the void sites, even for high surface area CaF/sub 2/ gel, precluded surface chemical reactions. EPR investigations of the S-state rare earth ions in Y-zeolite and in the synthetic mordenite, zeolon, yielded significant information on the site selectivity and crystal field (CF) interactions of these ions. Low symmetry strong CF interactions occur in both calcined and frozen hydratedmore » samples. Eu/sup 2 +/, reduced from Eu/sup 3 +/ by 77/sup 0/K ..gamma..-irradiation of hydrated zeolites, has a spectrum resembling that of Gd/sup 3 +/; reduction under calcining conditions yields a spectrum dominated by a g/sub eff/ = 4.89 line assigned to Eu/sup 2 +/ ions in Type II sites. Spectra were obtained for non-S-state rare earth ions at 4.2/sup 0/K., but extremely broad lines limited quantitative interpretation. Spin resonance observations were made on a Y-zeolite sample of composition Na/sub 30/La/sub 7/./sub 9/Gd/sub 0/./sub 8/ (AlO/sub 2/)/sub 56/-(SiO/sub 2/)/sub 136/. 240H/sub 2/O. Signals in spectra of evacuated samples showed orientational anisotropy and effects due to nonlinear ferromagnetic resonance. (DLC)« less
  • High resolution (8.45 and 11.7 Tesla) oxygen-17 NMR spectra have been obtained for a variety of oxides, oxyanions, carbonyls and for crystals and glasses in the system CaO-MgO-SiO/sub 2/ using magic-angle sample spinning (MASS) and variable-angle sample spinning (VASS) techniques. The results indicate that a very wide range of oxygen-17 quadrupole coupling constants and linewidths are to be anticipated in solid state oxygen-17 NMR studies. The linewidth of solid Mg/sup 17/O (0.3 ppm) is narrower than that of liquid water, due to the high symmetry of the oxygen site. In the SiO/sub 4//sup 2 -/ unit of forsterite, each nonequivalentmore » oxygen is partially resolved, and split by a large second-order quadrupole interaction, permitting determination of the isotropic chemical shifts, quadrupole coupling constants, and electric field gradient tensor asymmetry parameters for each of the three types of oxygen present. The oxygen-17 spectra of many glasses contain multiple peaks due to non-bridging oxygens, bridging oxygens coordinated to non-Q/sup 4/ silicons, and bridging oxygens coordinated to Q/sup 4/ silicons. The oxygen-17 quadrupole coupling constant decreases as the percent ionic character of the cation oxygen bond increases. For metasilicate crystals and glasses, the oxygen-17 chemical shift of the non-bridging oxygen becomes progressively deshielded as the ionic potential of the cation present increases.« less
  • This thesis emphasizes two frequency-domain techniques which uniquely employ radio frequency (RF) excitations to investigate the static and dynamic properties of novel magnetic and superconducting materials.
  • NMR experiments are reported for Sr 2CuO 2Cl 2, HgBa 2CuO 4+d, YNi 2B 2C and YBa 2Cu 3O 7. NMR studies typify three different aspects of microscopic properties of HTSC. In non-superconducting antiferromagnetic (AF) prototype Sr 2CuO 2Cl 2, we used NMR to investigate Cu 2+ correlated spin dynamics and AF phase transition in CuO 2 layers. In the superconductors, we used NMR both to investigate the electronic properties of the Fermi-liquid in normal and superconducting states and to investigate flux lattice and flux-line dynamics in the superconducting state in presence of magnetic field. A summary of each study is given: 35Cl NMR was measured in Sr 2CuO 2Cl 2 single crystals with T N=257K. 35Cl NMR relaxation rates showed crossover of Cu 2+ spin dynamics from Heisenberg to XY-like correlation at 290 K well above T N. A field-dependent T N for Hmore » $$\perp$$c was observed and explained by a field-induced Ising-like anisotropy in ab plane. 199Hg NMR was measured in HgBa 2CuO 4+d. Properties of the Fermi-liquid are characterized by a single-spin fluid picture and opening of a spin pseudo-gap at q=0 above T c. Below T c spin component of Knight shift decreases rapidly in agreement with prediction for d-wave pairing scheme. 11B and 89Y NMR/magnetization were measured in YNi 2B 2C. Temperature dependence of 11B Knight shift and of the NSLR gave a normal state which agrees with the Korringa relation, indicating that the AF fluctuations on the Ni sublattice are negligible. Opening of the superconducting gap obeys BCS. A NMR approach to investigate vortex thermal motion in HTSC is presented, based on contribution of thermal flux-lines motion to both T 2 -1 and T 1 -1. Effects are demonstrated in YBa 2Cu 3O 7and HgBa 2CuO 4+d.« less