Deuteron nuclear magnetic resonance investigation of LaNi$sub 5$D/sub x/ compounds

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The $sup 2$D quadrupole interaction was observable in all the samples of LaNi$sub 5$D/sub x/ up to a critical temperature T/sub c/ at which the intensity of the quadrupole interaction spectrum disappeared and only a narrow unsplit line remained. The critical temperatures were 360$sup 0$K for the x = 3.6 sample and 380$sup 0$K for the x = 5.7, 6.7 samples. Based on preliminary electric field gradient (EFG) calculations, it appears likely that several quadrupole interactions are being observed from inequivalent deuterium sites in the lattice. In the temperature range T greater than or equal to 300$sup 0$K, it appears ... continued below

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Pages: 65

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Nelson, S.O. October 1, 1975.

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  • Ames Laboratory
    Publisher Info: Ames Lab., Iowa (USA)
    Place of Publication: [Ames,] Iowa

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The $sup 2$D quadrupole interaction was observable in all the samples of LaNi$sub 5$D/sub x/ up to a critical temperature T/sub c/ at which the intensity of the quadrupole interaction spectrum disappeared and only a narrow unsplit line remained. The critical temperatures were 360$sup 0$K for the x = 3.6 sample and 380$sup 0$K for the x = 5.7, 6.7 samples. Based on preliminary electric field gradient (EFG) calculations, it appears likely that several quadrupole interactions are being observed from inequivalent deuterium sites in the lattice. In the temperature range T greater than or equal to 300$sup 0$K, it appears that diffusional averaging is not entirely isotropic and that the deuterium still occupies certain interstitial sites preferentially. The temperature dependence of the $sup 2$D characteristic quadrupole frequency ($nu$/sub Q/) and the disappearance of the $sup 2$D quadrupole interaction signal were found to be compatible with desorption of the deuterium from the LaNi$sub 5$ lattice with increasing temperature. Spectra obtained from D$sub 2$ gas samples under various experimental conditions (pure gas, gas above LaNi$sub 5$D$sub 6$.$sub 7$, and gas within or on LaNi$sub 5$ at 77$sup 0$K) may provide evidence for the identification of the solid-solution $alpha$-phase or for the existence of an adsorbed deuterium surface film on the LaNi$sub 5$. In addition, the spectra suggest that at 77$sup 0$K rapid deuterium exchange between the gas and surface contributes to spin-lattice relaxation and, hence, to broadening of the NMR resonance. (auth)

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Pages: 65

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  • Other Information: Thesis. Orig. Receipt Date: 30-JUN-76

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  • Report No.: IS-T--700
  • Grant Number: W-7405-ENG-82
  • DOI: 10.2172/4142751 | External Link
  • Office of Scientific & Technical Information Report Number: 4142751
  • Archival Resource Key: ark:/67531/metadc870097

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  • October 1, 1975

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  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 26, 2017, 7:13 p.m.

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Nelson, S.O. Deuteron nuclear magnetic resonance investigation of LaNi$sub 5$D/sub x/ compounds, thesis or dissertation, October 1, 1975; [Ames,] Iowa. (digital.library.unt.edu/ark:/67531/metadc870097/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.