14N nuclear quadrupole resonance and proton spin–lattice relaxation study of phase transition in pyridazine perchlorate

2009 ◽  
Vol 149 (13-14) ◽  
pp. 546-549 ◽  
Author(s):  
J. Seliger ◽  
V. Žagar ◽  
T. Asaji
Keyword(s):  
Phase Transition ◽  
Nuclear Quadrupole Resonance ◽  
Lattice Relaxation ◽  
Proton Spin ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Quadrupole Resonance ◽  
Relaxation Study ◽  
Nuclear Quadrupole

Proton spin-lattice relaxation study of the phase transition in TlH2AsO4

1978 ◽  
Vol 27 (10) ◽  
pp. 999-1001 ◽  
Author(s):  
R. Blinc ◽  
M. Rožmarin ◽  
F. Milia ◽  
M. Melisaropoulou
Keyword(s):  
Phase Transition ◽  
Lattice Relaxation ◽  
Proton Spin ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Relaxation Study

Potassium hexachloropalladate and potassium hexachloroplatinate: a comparative study using nuclear quadrupole resonance

1969 ◽  
Vol 47 (20) ◽  
pp. 2165-2169 ◽  
Author(s):  
Robin L. Armstrong ◽  
Douglas F. Cooke
Keyword(s):  
Temperature Dependence ◽  
Nuclear Quadrupole Resonance ◽  
Lattice Relaxation ◽  
Nuclear Quadrupole Resonance Frequency ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Lattice Mode ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

Measurements of the temperature dependence of the nuclear quadrupole resonance frequency νQ and spin–lattice relaxation time T1 of the 35Cl nuclei in powdered samples of K2PdCl6 are reported. The data are qualitatively similar to earlier results for K2PtCl6 and are analyzed in the same manner. The temperature dependence of both νQ and T1 are dominated by the F1g rotary lattice mode of frequency ~ 41 cm−1. The data for K2PdCl6 and K2PtCl6 are compared and the parameters characterizing the NQR behavior tabulated. It is suggested that the quantitative explanation of the rather small differences observed might provide a challenging problem for a molecular orbital theorist.

A Study of Complex Anionic Motions in (Me2NH2)2ZnCl4 Crystals by Means of Chlorine Nuclear Quadrupole Resonance Techniques

1990 ◽  
Vol 45 (3-4) ◽  
pp. 464-466 ◽  
Author(s):  
Hiroshi Yamamoto ◽  
Atsushi Ishikawa ◽  
Tetsuo Asaji ◽  
Daiyu Nakamura
Keyword(s):  
Phase Transition ◽  
Relaxation Time ◽  
Transition Temperature ◽  
Room Temperature ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

Abstract Three 35Cl NQR frequencies were observed for (Me2NH2)2ZnCl4 at room temperature, indicating the existence of three crystallographically nonequivalent chlorines in the crystal. With decreasing temperature, the frequency of the lines increased almost linearly and disappeared below ca. 220 K near the reported phase transition temperature (ca. 215 K) detected on cooling. The three NQR lines faded out above room temperature because of the occurrence of rapid anionic reorientational motions disclosed from measurements of the 35Cl NQR spin-lattice relaxation time.

NUCLEAR QUADRUPOLE RESONANCE STUDIES IN CUPROUS OXIDE

1966 ◽  
Vol 44 (10) ◽  
pp. 2315-2328 ◽  
Author(s):  
K. R. Jeffrey ◽  
R. L. Armstrong
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Cuprous Oxide ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Quadrupole Moments ◽  
Spin Lattice ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

The 63Cu and 65Cu pure nuclear quadrupole resonance transitions have been investigated in a powder sample of cuprous oxide from 4.2 °K to 298 °K. The observed decrease in resonance frequency with increasing temperature is discussed in terms of the theory developed by Bayer and Kushida. The spin-lattice relaxation-time measurements above 20.4 °K are interpreted in terms of a coupling of the lattice phonons to the nuclear quadrupole moments via two phonon Raman processes. A rough estimate of the Debye temperature is made. The measured relaxation times at 4.2 °K are an order of magnitude shorter than predicted by the spin-phonon mechanism. Two other mechanisms are discussed: (i) a coupling of the spins to torsional oscillations; (ii) a coupling of the spins to paramagnetic impurities.

Application of Nuclear Quadrupole Resonance Relaxometry to Study the Influence of the Environment on the Surface of the Crystallites of Powder

2015 ◽  
Vol 70 (6) ◽  
pp. 451-457 ◽  
Author(s):  
Nikolay Ya. Sinyavsky ◽  
Ivan G. Mershiev ◽  
Galina S. Kupriyanova
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Inverse Laplace Transform ◽  
Spin Lattice Relaxation ◽  
Two Dimensional ◽  
Surface Phenomena ◽  
Spin Lattice ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

AbstractThe results of the experimental study of the influence of the environment surrounding the surface of the crystallites of a KClO3 powder on the distribution of the spin–spin and spin–lattice relaxation times for 35Cl nuclear quadrupole resonance are described. It was found that the distributions of the spin–lattice relaxation times are unimodal and distributions of the spin–spin relaxation times are bimodal for all samples we studied. T1 – T2 and T1ρ – T2 correlations by means of the two-dimensional (2D) inverse Laplace transform are obtained. The efficiency of the method for the study of surface phenomena in solids is demonstrated.

Nuclear Quadrupole Resonance in Amorphous Semiconductors

1996 ◽  
Vol 51 (5-6) ◽  
pp. 603-610
Author(s):  
P. Craig Taylor
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Amorphous Semiconductors ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Structural Order ◽  
Quadrupole Resonance ◽  
Far From Equilibrium ◽  
Nuclear Quadrupole

Abstract Nuclear quadrupole resonance (NQR) has provided a valuable tool for investigating the local structural order in semiconducting glasses. Measurements of NQR lineshapes and spin-lattice relaxation times help elucidate the local structural order and the unusual vibrational properties, respectively, of these glasses. In addition, NQR lineshape measurements on samples that are made under conditions that produce solids whose structures are far from equilibrium, such as fast-evap-orated films or rapidly-drawn fibers, provide detailed information on the changes in the local structural order from that which occurs in the well-annealed amorphous semiconductors.

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