A Study of Thermal Motion of Ammine Groups in Carbonatotetramminecobalt(III) Sulfate

1973 ◽  
Vol 51 (7) ◽  
pp. 1107-1108 ◽  
Author(s):  
B. A. Dunell ◽  
M. D. Pachal ◽  
S. E. Ulrich
Keyword(s):  
Hydrogen Bonding ◽  
Lattice Relaxation ◽  
Activation Energies ◽  
Thermal Motion ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Relaxation Measurements

The results of spin–lattice relaxation measurements are reported for carbonatotetramminecobalt(III) sulfate. The observed TI minima and activation energies, 1.9 and 4.3 kcal, for the reorientation of ammine groups are interpreted on the basis of hydrogen bonding effects.

Segmental Diffusion in Rubbers Studied by Neutron Quasielastic Incoherent Scattering

1974 ◽  
Vol 47 (5) ◽  
pp. 1127-1135
Author(s):  
Geoffrey Allen ◽  
J. S. Higgins ◽  
C. J. Wright
Keyword(s):  
Lattice Relaxation ◽  
Activation Energies ◽  
Spin Lattice Relaxation ◽  
Self Diffusion ◽  
Spin Lattice ◽  
Nuclear Spin Lattice Relaxation ◽  
Relaxation Measurements ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Poly Propylene

Abstract Neutron scattering experiments on polymethylphenylsiloxane, poly(propylene oxide), poly(isobutylene), and poly(ethylene oxide) show broadening in the quasi-elastic region similar to that previously reported from polydimethylsiloxane. Measurements on partially deuterated samples confirm that the effect arises from segmental diffusive motion, rather than rotations of pendent side groups. The temperature dependence of this motion gives activation energies which are smaller than the activation energies for self-diffusion obtained from experiments of longer time-scale such as nuclear spin-lattice relaxation measurements and viscometry.

NMR studies of alkali intercalted carbon nanotubes

2003 ◽  
Vol 772 ◽  
Author(s):  
M. Schmid ◽  
C. Goze-Bac ◽  
M. Mehring ◽  
S. Roth ◽  
P. Bernier
Keyword(s):  
Carbon Nanotubes ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Energy Storage Devices ◽  
Nmr Studies ◽  
Storage Devices ◽  
Spin Lattice ◽  
Relaxation Measurements ◽  
Resonance Spin ◽  
Walled Carbon Nanotubes

AbstractLithium intercalted carbon nanotubes have attracted considerable interest as perspective components for energy storage devices. We performed 13C Nuclear Magnetic Resonance spin lattice relaxation measurements in a temperature range from 4 K up to 300 on alkali intercalated Single Walled Carbon Nanotubes in order to investigate the modifications of the electronic properties. The density of states at the Fermi level were determined for pristine, lithium and cesium intercalated carbon nanotubes and are discussed in terms of intercalation and charge transfer effects.

Chain Flexibility and31P NMR Spin−Lattice Relaxation Measurements on Melts of Halogenated Poly(thionylphosphazenes)

1997 ◽  
Vol 30 (22) ◽  
pp. 6869-6872 ◽  
Author(s):  
R. Jaeger ◽  
G. J. Vancso ◽  
D. Gates ◽  
Y. Ni ◽  
I. Manners
Keyword(s):  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Chain Flexibility ◽  
Spin Lattice ◽  
Relaxation Measurements

Novel spin dynamics in ferrimagnetic molecular chains from NMR and μSR spin–lattice relaxation measurements

2004 ◽  
Vol 272-276 ◽  
pp. 1087-1088 ◽  
Author(s):  
E. Micotti ◽  
A. Lascialfari ◽  
A. Rigamonti ◽  
S. Aldrovandi ◽  
A. Caneschi ◽  
...  
Keyword(s):  
Spin Dynamics ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Relaxation Measurements

Anion reorientations and cation diffusion in a carbon-substituted sodium nido-borate Na-7,9-C2B9H12: 1H and 23Na NMR studies

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Alexander V. Skripov ◽  
Olga A. Babanova ◽  
Roman V. Skoryunov ◽  
Alexei V. Soloninin ◽  
Terrence J. Udovic
Keyword(s):  
Lattice Relaxation ◽  
Activation Energies ◽  
Spin Lattice Relaxation ◽  
Relaxation Rates ◽  
Cation Diffusion ◽  
Relaxation Data ◽  
Nmr Studies ◽  
Spin Lattice ◽  
Jump Rate ◽  
Disordered Phase

Abstract Polyhydroborate-based salts of lithium and sodium have attracted much recent interest as promising solid-state electrolytes for energy-related applications. A member of this family, sodium dicarba-nido-undecahydroborate Na-7,9-C2B9H12 exhibits superionic conductivity above its order-disorder phase transition temperature, ∼360 K. To investigate the dynamics of the anions and cations in this compound at the microscopic level, we have measured the 1H and 23Na nuclear magnetic resonance (NMR) spectra and spin-lattice relaxation rates over the temperature range of 148–384 K. It has been found that the transition from the low-T ordered to the high-T disordered phase is accompanied by an abrupt, several-orders-of-magnitude acceleration of both the reorientational jump rate of the complex anions and the diffusive jump rate of Na+ cations. These results support the idea that reorientations of large [C2B9H12]− anions can facilitate cation diffusion and, thus, the ionic conductivity. The apparent activation energies for anion reorientations obtained from the 1H spin-lattice relaxation data are 314 meV for the ordered phase and 272 meV for the disordered phase. The activation energies for Na+ diffusive jumps derived from the 23Na spin-lattice relaxation data are 350 and 268 meV for the ordered and disordered phases, respectively.

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