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The influence of defects in the crystal structure on helium diffusion in quartz |
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| Authors: | T S Argunova L M Sorokin B Z Pevzner V S Balitskii M A Gannibal J H Je Y Hwu W -L Tsai |
| Institution: | (1) Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia;(2) Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, ul. Odoevskogo 24/2, St. Petersburg, 199155, Russia;(3) Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia;(4) Geological Institute, Kola Research Center, Russian Academy of Sciences, ul. Fersmana 14, Apatity, Murmanskaya oblast, 184209, Russia;(5) Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Republic of Korea;(6) Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan, Republic of China |
| Abstract: | The solubility and diffusion of helium in quartz crystals are investigated as functions of the distribution and density of structural defects. The types of defects in the crystals are identified and their distribution over growth sectors is determined by x-ray diffraction topography and phase radiography with a synchrotron radiation source. The effective solubility and effective diffusion coefficients for helium in quartz are estimated from the experimental data on the amount of helium extracted from samples with different contents of defects. It is revealed that the effective diffusion coefficient of helium depends on the number of dislocations. |
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