AN EXAMINATION OF VERWEY'S MODEL FOR THE LATTICE STRUCTURE OF THE FREE SURFACE OF ALKALI HALIDE CRYSTALS

1956 ◽  
Vol 34 (3) ◽  
pp. 265-275 ◽  
Author(s):  
G. C. Benson ◽  
H. P. Schreiber ◽  
D. Patterson
Keyword(s):  
Free Surface ◽  
Surface Energy ◽  
Surface Structure ◽  
Alkali Halide ◽  
Mechanical Stability ◽  
Lattice Structure ◽  
Lithium Salts ◽  
Repulsive Potentials ◽  
Alkali Halide Crystals ◽  
Effect Of Surface

The Verwey model for the free surface structure of alkali halide crystals at 0° K. has been used to estimate the effect of surface distortion on the surface energy of these crystals. It appears that the contributions from distortion are considerably larger than previously reported. In the case of some lithium salts the corrected surface energy becomes negative; the mechanical stability of the solid is considered in the light of this. Several aspects of the Verwey model have been examined. These include the effect of various repulsive potentials and forms of distortion.

Mechanical stability of alkali halide crystals

1973 ◽  
Vol 14 (1) ◽  
pp. 110-112
Author(s):  
V. A. Kuchin ◽  
V. A. Zhdanov ◽  
N. A. Stakhin
Keyword(s):  
Alkali Halide ◽  
Mechanical Stability ◽  
Alkali Halide Crystals

Glass-Crystal Boundaries in Liquid-Phase Sintered Ceramics

2000 ◽  
Vol 620 ◽  
Author(s):  
N. Ravishankar ◽  
C. Barry Carter
Keyword(s):  
Free Surface ◽  
Liquid Phase ◽  
Surface Energy ◽  
Grain Boundary ◽  
Surface Structure ◽  
Glass Crystal ◽  
The Difference ◽  
Crystal Boundaries

ABSTRACTThe interface between dewet glass droplets and the free surface of a crystal and the interface between the intergranular glass and adjoining crystalline grains have been examined with particular emphasis on the influence of the crystallography of the free surface and the grain boundary. The wetting of liquid on the free surface has been shown to depend on the surface structure. The migration of boundaries containing a liquid phase has been studied. The migration is initiated by the difference in surface energy of the bounding planes. Faceting of the grain boundary planes has been examined. It is proposed that the boundary migrates by the motion of the facets.

PHONON BROADENING OF EMISSION SPECTRA FOR STE AND AUGER-FREE LUMINESCENCE

2001 ◽  
Vol 15 (28n30) ◽  
pp. 4032-4035 ◽  
Author(s):  
V. N. MAKHOV ◽  
V. N. KOLOBANOV ◽  
M. KIRM ◽  
S. VIELHAUER ◽  
G. ZIMMERER
Keyword(s):  
Alkali Halide ◽  
Lattice Structure ◽  
Thermal Quenching ◽  
Emission Spectra ◽  
Luminescence Spectra ◽  
Phonon Modes ◽  
Exciton Emission ◽  
Different Types ◽  
Alkali Halide Crystals ◽  
Typical Temperature

The temperature dependencies of the bandwidths for self-trapped exciton emission spectra in several alkali halide crystals with high temperature of thermal quenching for self-trapped exciton emission (NaBr, KI, CsI) have been studied and compared with a typical temperature behavior of Auger-free luminescence spectra. It was shown that different phonon modes are responsible for broadening of emission band for different types of self-trapped excitons as well as for different bands in the spectrum of Auger-free luminescence. The features found indicate that the lattice structure of emitting state for Auger-free luminescence has most probably the on-center character.

Anion polarizability functions in alkali halide crystals

1997 ◽  
Vol 92 (6) ◽  
pp. 1029-1033
Author(s):  
A. BATANA ◽  
J. BRUNO ◽  
R.W. MUNN
Keyword(s):  
Alkali Halide ◽  
Alkali Halide Crystals
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