Structure, Bonding, Dynamics: NMR Studies

Müller‐Warmuth, W.

doi:10.1007/978-94-011-0890-4_6

Cited by 20 publications

(24 citation statements)

References 132 publications

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“…Alternatively these clusters may be viewed as being formed by edge sharing Na͑H 2 O͒ 6 octahedra. This model accounts not only for the density of the interlamellar water but also the average Na to H 2 O stoichiometric ratio of 1:4 which is in between that of an isolated Na͑H 2 O) 6 and the infinite Na͑H 2 O) 2 sheet. Cd 0.75 PS 3 Na 0.5 ͑H 2 O͒ 2 is conducting with a dc conductivity of 10 Ϫ6 s/cm at 300 K and Arrhenius activation energy 15.6 kcal/mol.…”

Section: Introductionmentioning

confidence: 99%

“…The technique has been used to study the motion of guest molecules intercalated in layered host lattices. 6 Motion of the guest in such systems has been shown to be strongly anisotropic due to the constrained environment imposed by the host lattice layers. There have been previous reports on 1 H NMR of hydrated layered compounds especially clays 7 and the layered hydrated chalcogenides.…”

Section: Introductionmentioning

confidence: 99%

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Motion of interlamellar hydrated sodium ions in layered Cd0.75PS3Na0.5(H2O)2

Arun

Jeevanandam

Vasudevan

et al. 1999

The Journal of Chemical Physics

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The motion of hydrated Na ions in the galleries of layered Cd 0.75 PS 3 Na 0.5 ͑H 2 O͒ 2 have been investigated by proton and 23 Na NMR and impedance measurements as a function of temperature. The material is conducting and the frequency dependent conductivity exhibits a power law characteristic of non-Debye-like electrical conductivity relaxation, arising from Coulomb correlation among charge carriers. The NMR spectra indicates that the interlamellar Na ions are mobile and there is good agreement between the 23 Na spin-lattice relaxation rates and the electrical conductivity relaxation. The proton NMR exhibits a well resolved orientation dependent dipolar splitting which has been rationalized by considering the anisotropic rotational motion of water molecules in the pseudo-octahedral hydration shell of the Na ion. Isotropically tumbling water as well as proton hopping among water molecules is absent in Cd 0.75 PS 3 Na 0.5 ͑H 2 O͒ 2. Evidence is presented to show that within the galleries the Na ion moves along with its hydration shell, the motion being such that the orientation of the C ជ 2 axis of the water molecule with respect to the normal to the layers is always preserved. The motion of the hydrated Na ions are correlated through their mutual Coulombic interaction but the rotational motion of the water molecule in the ions hydration shell may still be described by a single exponential Debye-like relaxation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Motion of interlamellar hydrated sodium ions in layered Cd0.75PS3Na0.5(H2O)2

Arun

Jeevanandam

Vasudevan

et al. 1999

The Journal of Chemical Physics

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“…1,2 Traditionally, MoS 2 has been used as a dry lubricant 3 that is stable up to 623 K. Currently, interest is focused on applications as: band-gap engineering materials; 4,5 nano-electronic devices; 2,6–8 photovoltaic devices; 9,10 valley-tronics applications; 11,12 2D building blocks for electronic heterostructures; 13 and as sensor materials. 14 …”

Section: Introductionmentioning

confidence: 99%

Prediction of entropy stabilized incommensurate phases in the system MoS2−MoTe2

Burton

Singh

2016

Journal of Applied Physics

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A first principles phase diagram calculation, that included van der Waals interactions, was performed for the 3D bulk system (1 − X) · MoS2 − (X) · MoTe2. Surprisingly, the predicted phase diagram has at least two ordered phases, at X ≈ 0:46, even though all calculated formation energies are positive; in a ground-state analysis that examined all configurations with 16 or fewer anion sites. The lower-temperature I-phase is predicted to transform to a higher-temperature I′-phase at T ≈ 500 K, and I′ disorders at T ≈ 730 K. Both these transitions are predicted to be first-order, and there are broad two-phase fields on both sides of the ordered regions. Both the I- and I′-phases are predicted to be incommensurate, i.e., aperiodic: I-phase in three dimensions; and I′-phase in two dimensions.

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“…These phosphates are acidic solids of intermediate strength, favoring readily the intercalation of amines (2). The intercalation behavior depends mainly on properties associated with the guest molecule such as size and polarity (3,4).…”

Section: Introductionmentioning

confidence: 99%