Abstract
Experimental investigations on the defect sub-structure and surface modifications, brought about by He+ ion-bombardment of calcite cleavages (100), have been carried out. Optical and scanning electron microscopic investigations revealed drastic modifications on the surface morphology, local symmetry and defect concentration. Additional structural defects on ion-bombardment of calcite surfaces also have been observed. Changes in shape and form of chemical etch pits are found to be a function of ion-beam energy, as studied by optical microscopy. Radiation damage in calcite has been attributed mainly due to desorption of CO −23 ions from the calcite surfaces, on irradiation. Measurements of surface conductivity on irradiated calcite surfaces have been made employing a four-probe technique. Enhancement of surface conductivity has been considered to be due to an increase in concentration of CO −23 ions formed, on ion irradiation and subsequent thermal stimulation. Planar plastic anisotropy has been studied on irradiated calcite cleavages by measurement of microhardness.
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References
Arnold G W and Peercy P S 1980 Non-Cryst. Solids 41 359
Baer D R, Blanchard Jr D L, Engelhard M H and Zachara J M 1991 Surf-interf. Anal. 17 1723
Christie A B, Sutherland I and Walls J M 1981 Vacuum 31 530
de Lima J F, Valerio M E G and Okuno E 2001 Phys. Rev. B64 014105
Frenken J W M and van der Veen J F 1985 Phys. Rev. Lett. 54 134
Ponnusamy V, Ramasamy V and Anandalakshmi K 2006 Indian J. Pure Appl. Phys. 44 431
Ponnusamy V, Ramasamy V, Anandalakshmi K and Jose M T 2007 Indian J. Phys. 81 331
Ramasamy V, Dheenathayalu M, Ponnusamy V, Hemalatha J and Prasanna Lakshmi P 2003 Indian J. Phys. B77 443
Runyan W R 1975 Semiconductor measurements and instrumentation (Mc Graw-Hill)
van der Veen J F 1985 Surf. Sci. Rep. 5 199
Wonsiewiez B C and Chin G Y 1973 The Science of hardness testing (eds) J H Westbook and H Conrad (ASM) p. 67
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Venkateshwar Rao, E., Ramakrishna Murthy, M. Ion beam modifications of defect sub-structure of calcite cleavages. Bull Mater Sci 31, 139–142 (2008). https://doi.org/10.1007/s12034-008-0024-2
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DOI: https://doi.org/10.1007/s12034-008-0024-2