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Diffusion of strontium ion in silver chloride
Vol.7, No. 10
ABSTRACTS OF PAPERS TO APPEAR IN
R. Kleirn and F. Rags (Laboratoire de Spectroscopie et d’Optique du Corps Solide, associé au C.N.R.S., Institut de Physique, Université de Strasbourg) The emission spectrum of PbI2 on the low energy side of the fundamental exciton absorption, is in spectrum the temperature range 4,2—180°K. An studied emission composed of many lines, is observed. The lines are interpreted as free exciton, bound exciton, and phonon assisted recombination lines. Temperature dependence of the position of the free exciton line is studied, The experimental results are shown to agree with the hypothesis of a lattice expansion effect at low temperatures and an electron-lattice interaction at higher temperatures. A very short luminescence lifetime (5 x 10_b sec) of the above lines is measured by the ‘single photoelectron’ technique. (Received 16 July 1968) (Revised 5 March 1969)
7.
LOW TEMPERATURE SUPPRESSION BY CHLORINE OF DIFFUSION OF GOLD IN SILVER CHLORIDE A.P. Batra, A.L. Laskar and L. Slifkiri (Department of Physics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina)
The tracer-sectioning technique was used to study the diffusion of aurous ion in silver chloride. Above 260°C, the diffusion proceeds interstitially with an activation energy of 0.47eV. When the diffusion anneal was carried out in an external chlorine atmosphere, the diffusion coefficient was depressed. This behavior is explained in terms of the effect of chlorine on the cation vacancy concentration, and agrees quantitatively with results obtained from optical absorption studies by Ulrici, Koswig, and Stasiw. Analysis of the data yields 0.62eV for the heat of the reaction: ~ Cl~= Cl + cation vacancy + hole. (Received 24 December 1968)
8.
J.
PHYS. CHEM. SOLIDS
iii
DIFFUSION OF STRONTIUM ION IN SILVER CHLORIDE A.L. Laskar, A.P. Batra, and L. Slifkin (Department of Physics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina)
24 in energy diffusion of Sr of AgCIThe hasactivation been found to be for 0.98eV, by means a standard sectioning technique. The results are consistent with a vacancy mechanism and corroborate the hypothesis that ions with no outer d-shell electrons diffuse almost entirely substitutionally in silver halides. (Received 24 December 1968)
ABSTRACTS OF PAPERS TO APPEAR IN
R. Kleirn and F. Rags (Laboratoire de Spectroscopie et d’Optique du Corps Solide, associé au C.N.R.S., Institut de Physique, Université de Strasbourg) The emission spectrum of PbI2 on the low energy side of the fundamental exciton absorption, is in spectrum the temperature range 4,2—180°K. An studied emission composed of many lines, is observed. The lines are interpreted as free exciton, bound exciton, and phonon assisted recombination lines. Temperature dependence of the position of the free exciton line is studied, The experimental results are shown to agree with the hypothesis of a lattice expansion effect at low temperatures and an electron-lattice interaction at higher temperatures. A very short luminescence lifetime (5 x 10_b sec) of the above lines is measured by the ‘single photoelectron’ technique. (Received 16 July 1968) (Revised 5 March 1969)
7.
LOW TEMPERATURE SUPPRESSION BY CHLORINE OF DIFFUSION OF GOLD IN SILVER CHLORIDE A.P. Batra, A.L. Laskar and L. Slifkiri (Department of Physics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina)
The tracer-sectioning technique was used to study the diffusion of aurous ion in silver chloride. Above 260°C, the diffusion proceeds interstitially with an activation energy of 0.47eV. When the diffusion anneal was carried out in an external chlorine atmosphere, the diffusion coefficient was depressed. This behavior is explained in terms of the effect of chlorine on the cation vacancy concentration, and agrees quantitatively with results obtained from optical absorption studies by Ulrici, Koswig, and Stasiw. Analysis of the data yields 0.62eV for the heat of the reaction: ~ Cl~= Cl + cation vacancy + hole. (Received 24 December 1968)
8.
J.
PHYS. CHEM. SOLIDS
iii
DIFFUSION OF STRONTIUM ION IN SILVER CHLORIDE A.L. Laskar, A.P. Batra, and L. Slifkin (Department of Physics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina)
24 in energy diffusion of Sr of AgCIThe hasactivation been found to be for 0.98eV, by means a standard sectioning technique. The results are consistent with a vacancy mechanism and corroborate the hypothesis that ions with no outer d-shell electrons diffuse almost entirely substitutionally in silver halides. (Received 24 December 1968)