scholarly journals The Orbit?Lattice Interaction for Lanthanide Ions. II. Strain and Relaxation Time Predictions for Cubic Systems

1980 ◽  
Vol 33 (4) ◽  
pp. 733 ◽  
Author(s):  
DJ Newman
Keyword(s):  
Crystal Field ◽  
Lattice Relaxation ◽  
Lanthanide Ions ◽  
Spin Lattice Relaxation ◽  
Superposition Model ◽  
Unknown Parameters ◽  
Paramagnetic Resonance ◽  
Spin Lattice ◽  
Relaxation Experiments ◽  
Cubic Systems

An analysis of dynamic crystal field data for cubic systems is carried out in order to assess the possible usefulness of the superposition model in understanding the results of lattice strain and spin-lattice relaxation experiments. The data used in this work are the electron paramagnetic resonance (EPR) results for strained cubic crystals obtained by Buisson, Baker and their coworkers, and the spinlattice relaxation results obtained by Buisson, Stapleton and their coworkers. A method of generalizing the superposition model to take into account long range electrostatic contributions without introducing additional unknown parameters is proposed, and shown to give consistent results. It is concluded that differences between bulk and local strains must be taken into account in any model of the dynamic crystal field, if it is to achieve success.

The influence of thermal conduction in spin-lattice relaxation experiments

Physica B+C ◽  
1978 ◽  
Vol 95 (2) ◽  
pp. 173-182 ◽  
Author(s):  
G.J. Gerritsma ◽  
J. Flokstra ◽  
G.A. Hartemink ◽  
J.J.M. Scholten ◽  
A.J.W.A. Vermeulen ◽  
...  
Keyword(s):  
Thermal Conduction ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Relaxation Experiments

OPTICAL FARADAY ROTATION STUDIES OF PARAMAGNETIC RESONANCE IN NEODYMIUM ETHYLSULPHATE

1963 ◽  
Vol 41 (1) ◽  
pp. 33-45 ◽  
Author(s):  
K. E. Rieckhoff ◽  
D. J. Griffiths
Keyword(s):  
Steady State ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Spin Interaction ◽  
Spatial Gradient ◽  
Constant Field ◽  
Paramagnetic Resonance ◽  
Spin Lattice ◽  
Relaxation Effects

The magneto-optical Faraday effect was used to measure the saturation of the spin levels in concentrated neodymium ethylsulphate in both steady-state and pulsed microwave resonance experiments at liquid helium temperatures. The steady-state experiments yielded the paramagnetic resonance spectrum consisting of a main triplet and an extensive hyperfine structure. The line positions are explained in terms of the known spin Hamiltonian of the diluted salt and spin–spin interaction between nearest neighbors. An asymmetry of the line shape was observed for sufficiently low temperatures in qualitative agreement with existing theories. Measurements of saturation s versus microwave power P at constant field and temperature were made and yielded the relationship [Formula: see text] for s > 10%. The steady-state experiments also revealed the existence of a spatial gradient in the saturation across the sample.The pulsed experiments gave the spin–lattice relaxation time τ as a function of magnetic field H at various temperatures. At 4.2 °K, τ was found to be independent of H and of the order of 11 msec for fields from 800 to [Formula: see text], while at temperatures below 2 °K, τ was found to be strongly field-dependent, indicating the importance of cross-relaxation effects at temperatures [Formula: see text].

scholarly journals Correlated Dynamics in Ionic Liquids by Means of NMR Relaxometry: Butyltriethylammonium bis(Trifluoromethanesulfonyl)imide as an Example

2021 ◽  
Vol 22 (17) ◽  
pp. 9117
Author(s):  
Danuta Kruk ◽  
Elzbieta Masiewicz ◽  
Sylwia Lotarska ◽  
Roksana Markiewicz ◽  
Stefan Jurga
Keyword(s):  
Diffusion Coefficients ◽  
Lattice Relaxation ◽  
Rotational Correlation Time ◽  
Spin Lattice Relaxation ◽  
Correlation Effects ◽  
Self Diffusion ◽  
Spin Lattice ◽  
Translational Movement ◽  
Nmr Relaxometry ◽  
Relaxation Experiments

1H and 19F spin-lattice relaxation experiments have been performed for butyltriethylammonium bis(trifluoromethanesulfonyl)imide in the temperature range from 258 to 298 K and the frequency range from 10 kHz to 10 MHz. The results have thoroughly been analysed in terms of a relaxation model taking into account relaxation pathways associated with 1H–1H, 19F–19F and 1H–19F dipole–dipole interactions, rendering relative translational diffusion coefficients for the pairs of ions: cation–cation, anion–anion and cation–anion, as well as the rotational correlation time of the cation. The relevance of the 1H–19F relaxation contribution to the 1H and 19F relaxation has been demonstrated. A comparison of the diffusion coefficients has revealed correlation effects in the relative cation–anion translational movement. It has also turned out that the translational movement of the anions is faster than of cations, especially at high temperatures. Moreover, the relative cation–cation diffusion coefficients have been compared with self-diffusion coefficients obtained by means of NMR (Nuclear Magnetic Resonance) gradient diffusometry. The comparison indicates correlation effects in the relative cation–cation translational dynamics—the effects become more pronounced with decreasing temperature.

Tunnelling resonance effects in non-resonant spin-lattice relaxation experiments

Physica B+C ◽  
1979 ◽  
Vol 97 (1) ◽  
pp. 41-46 ◽  
Author(s):  
A.J. van Duyneveldt ◽  
J.A. van Santen ◽  
H.A. Groenendijk ◽  
Richard L. Carlin
Keyword(s):  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Resonance Effects ◽  
Spin Lattice ◽  
Relaxation Experiments
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