Articles you may be interested inEffect of concentration on the thermodynamics of sodium chloride aqueous solutions in the supercooled regime
Dynamics of cavitation bubble induced by 193 nm ArF excimer laser in concentrated sodium chloride solutionsThe .electrical cond?-ctivity of sodium chloride, containing cadmium chloride as an impurity, has been ?etermme~ a~ a ~unction of tempe.rature. From these data it is calculated that the mobility of the positive IOn vacancies IS gIVen by the equation 11= (19600/T)exp( -9860/T) cm. 2 /volt-sec. between 250°C and 400°C !he concentration of positive ion vacancies in a "pure" sodium chloride crystal was 1.0X 10 17 cm-3 and mdependent of temperature below 550°C.
The emission, excitation, and absorption spectra of silver-activated alkali halides have been investigated. Three absorption bands due to ionic silver have been observed in NaCl, NaBr, KCl, and KBr, and the growth of these bands with silver concentration has been studied. In each of these crystals the two shorter-wavelength bands are ascribed to isolated silver ions, while the band of longest wavelength is ascribed to pairs of silver ions.
Upon x-ray irradiation as many as five new absorption bands arise in certain alkali halides in addition to the F band. Excitation into three of these bands (designated as the B, C, and D bands) produces luminescence, the emission spectrum being different for each band. The B band is attributed to a center consisting of an electron trapped at a silver ion adjacent to a halogen-ion vacancy; the C band to an electron trapped at a complex of two silver ions adjacent to a halogen-ion vacancy; and the D band to a hole trapped at an alkali-ion vacancy adjacent to a silver ion.
identical with those used to measure the relative changes in the Seebeck coefficient (AQ)/Q 0 . A chopper technique was used to eliminate the effect of the temperature gradient on the resistivity measurements. The relation between (AQ)/Q 0 and (Ap)/p 0 gives directly a simple function of the parameters K and JL. A second relation involving K, Q||, and Q ± is obtained from the zero-strain value of the Seebeck coefficient.We have used the K values given by Goldberg 2 to calculate (?.. and Q ± . Subtracting the electronic part of these as estimated from low-field Hall data, we have found the ratio of the components of the phonon-drag Seebeck tensor for a single Recent experimental work in this laboratory on the F-center production in synthetic sodium chloride at room temperature by ionizing radiation has revealed growth curves for synthetic crystals which differ from those obtained for halite. From Fig. 1 it can be seen that the nat-IOXI0 17 ENERGY ABSORBED (ev/cm 3 )
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