GRADIENT-ELASTIC TENSOR OF ALKALI HALIDE CRYSTALS
The origin of an electric field gradient due to strains in alkali halide crystals is studied from the experimental determination of gradient-elastic tensors. Tensors for /sup 23/Na, /sup 35/Cl, /sup 81/Br and /sup 127/I in a series of crystals are determined from the quadrupolar broadening of resonance lines due to solute ions, using lattice distortion derived from lattice parameter changes. Results are interpreted by the theory that takes account of the contribution from valence electrons, besides point charge arrays, and gives an expression of a gradient-elastic tensor in terms of an anti-shielding factor, overlap integrals and a degree of covalency. An excellent agreement is found between the theoretical and experimental tensor values for /sup 23/Na in NaCl, for which both theory and experiment are least ambiguous. For other crystals, a degree of covalency is tentatively estimated, with reasonable results. (auth)
- Research Organization:
- Tokyo Univ.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-18-016562
- OSTI ID:
- 4049883
- Journal Information:
- J. Phys. Soc. Japan, Journal Name: J. Phys. Soc. Japan Vol. Vol: 19
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Related Subjects
BROMINE 81
CHLORINE 35
CONFIGURATION
CRYSTALS
DEFORMATION
DIFFERENTIAL EQUATIONS
ELASTICITY
ELECTRIC FIELDS
ELECTRONS
HALIDES
INTEGRALS
IODINE 127
IONS
LATTICES
MEASURED VALUES
PHYSICS
QUADRUPOLES
QUANTITATIVE ANALYSIS
RESONANCE
SODIUM 23
SODIUM CHLORIDES
SOLUTIONS
SPECTRA
TENSORS
VALENCE
VECTORS