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Thomas K. Halstead

Bio: Thomas K. Halstead is an academic researcher from University of York. The author has contributed to research in topics: Proton NMR & Spin–lattice relaxation. The author has an hindex of 12, co-authored 22 publications receiving 434 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the proton magnetic resonance spectrum of lanthanum nickel hydride LaNi5.3H6 was measured over the temperature range 118°K < T < 300°K.

66 citations

Journal ArticleDOI
TL;DR: In this paper, the authors reported the NMR relaxation times (T2 T1, and T1ϱ) and absorption spectra for the compounds H1.71MoO3 (red monoclinic) and H0.36MoO 3 (blue orthorhombic) in the temperature range 77 K < T < 450 K.

63 citations

Journal ArticleDOI
TL;DR: In this article, the authors measured the relaxation times in hydrogen uranyl phosphate and arsenate, which are fast proton conductors, and found that the two compounds undergo a phase transition resulting in discontinuities in T/sub 1/ and t/sub 2/ and a DTA peak.

58 citations

Journal ArticleDOI
TL;DR: In this paper, a reduction of WO3 single crystals was carried out in terms of proton diffusion to give an activation energy of about 16 kJ mole−1 and a correlation time preexponential factor of about 70 nsec for the process.

47 citations

Journal ArticleDOI
TL;DR: In this article, the temperature dependences for conductivities and 1 H NMR relaxation times for homionic (exchanged) montmorillonite clays are reported and the Ionic conductivity in the interlayer region is primarily protonic (H + ), arising from the Bronsted acidity of hydrated interlayer cations.

37 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the preparation of a colloidal colloidal by un procede sol gel is described, and a procedure for determination des proprietes electriques et electrochimiques is described.

2,040 citations

Book ChapterDOI
TL;DR: In this paper, the authors highlight the significant developments in the field of polymer-montmorillonite clay based nanocomposites with specific focus on synthetic methodologies used, characterization, and evaluation of relevant bulk properties of these composites.
Abstract: The review aims at highlighting the significant developments in the field of polymer-montmorillonite clay based nanocomposites with specific focus on synthetic methodologies used, characterization, and evaluation of relevant bulk properties of these composites.

431 citations

Journal ArticleDOI
J.J.G. Willems1, K.H.J. Buschow1
TL;DR: In this article, a brief historical survey is given of how the study of coercitivity mechanisms in SmCo5 permanent-magnet materials eventually led to the discovery of the favorable hydrogen sorption properties of the compound LaNi5.
Abstract: A brief historical survey is given of how the study of coercitivity mechanisms in SmCo5 permanent-magnet materials eventually led to the discovery of the favourable hydrogen sorption properties of the compound LaNi5. It is shown how continued research by many investigators dealing with a variety of different physical and chemical properties has resulted in an advanced understanding of some of the principles that govern hydrogen absorption and which are responsible for the changes in physical properties that accompany it. The problems associated with various applications of LaNi5-based hydrogen-storage materials are also briefly discussed. A large part of this paper is devoted to the applicability of LaNi5-type materials in batteries. Research in this area has resulted in the development of a new type of rechargeable battery: the nickel-hydride cell. This battery can be charged and discharged at high rates and is relatively insensitive to overcharging and overdischarging. Special attention is given to the nature of the electrode degradation process and the effect of composition variations in LaNi5-related materials on the lifetime of the corresponding hydride electrodes when subjected to severe electrochemical charge-discharge cycles.

409 citations

Journal ArticleDOI
TL;DR: In this article, the authors describe the principles and magnetic resonance applications of laser-polarized noble gases, including void-space imaging of organisms and materials, NMR and MRI of living tissues, probing structure and dynamics of molecules in solution and on surfaces, and NMR sensitivity enhancement via polarization transfer.

404 citations