Nuclear Magnetic Relaxation in Ionic Crystals at High Temperatures

Nuclear Magnetic Relaxation in Ionic Crystals at High Temperatures

The spin-lattice relaxation time is measured by the recovery method for Na/sup 23/ and F/sup 19/ nuclei in NaCl, NaF, BaF./sub 2/, and LiF, at temperatures up to approximately 900 deg K, The Na/sup 23/ relaxation time is well predicted by phonon-phonon interaction theory at the lower temperatures, a...

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Veröffentlicht in:Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, 1962-04, Vol.126 (1), p.125-129
Hauptverfasser: Mahendroo, P. P., Nolle, A. W.
Format: Artikel
Sprache:eng
Schlagworte:
BARIUM FLUORIDES
CRYSTALS
DIFFUSION
ENERGY
ENERGY RANGE
EV RANGE
FLUORINE 19
HIGH TEMPERATURE
IMPURITIES
INTERACTIONS
IONS
LATTICES
LITHIUM FLUORIDES
MAGNETISM
MEASURED VALUES
NUCLEI
PARAMAGNETISM
PHONONS
PHYSICS
RELAXATION
SODIUM 23
SODIUM CHLORIDES
SODIUM FLUORIDES
SPIN
SPIN-LATTICE RELAXATION
VACANCIES
VIBRATIONS
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Zusammenfassung:The spin-lattice relaxation time is measured by the recovery method for Na/sup 23/ and F/sup 19/ nuclei in NaCl, NaF, BaF./sub 2/, and LiF, at temperatures up to approximately 900 deg K, The Na/sup 23/ relaxation time is well predicted by phonon-phonon interaction theory at the lower temperatures, and by vacancy diffusion theory in higher ranges. The F/sup 19/ relaxation time at the lower temperatures (below 500 to 700 deg K, depending onthe compound) is attributed to spin-spin diffusion in conjunction with paramagnetic impurities; at higher temperatures a decrease consistent with the effects of vacancy diffusion is observed, with an activation energy of 0.65 ev in NaF and of 0.82 ev in BaF/ sub 2/. (auth)
ISSN:0031-899X
DOI:10.1103/PhysRev.126.125