Damage creation in swift heavy ion-irradiated calcite single crystals: Raman and Infrared study

Abstract

a b s t r a c tRaman and Infrared studies were carried out on pristine and 100 MeV Ag 8+ ion irradiated calcite single crystals in the fluence range 1 × 10 11 to 1 × 10 13 ions/cm 2 . Raman and Infrared modes were assigned according to factor theory analysis. It is observed that the intensities of the Raman and infrared bands decrease with increase of ion fluence. The decrease of these bands is attributed to breakage of carbonate ions and other details are discussed.

The effect of irradiation on the atomic structure and chemical durability of calcite and dolomite

“…3a) is postulated to be on account of the ion implantation-induced reorganization of existing defects in the crystal structure, 31 which could have resulted in the observed reduction in dissolution rate as noted above. Previously, Nagabhushana et al 15 showed both reduction in the peak intensity and peak broadening upon ion implantation in calcite for peaks corresponding to the CO 2À 3 group's bending and stretching modes. This was attributed to the breakage of carbonate bond (-C-O-) or changes in the crystallite size due to irradiation-induced volume expansion.…”

“…For example, for calcite, whereas some studies reported negligible changes both in its atomic structure and dissolution kinetics, 7,14 others indicate an evolution toward an amorphous atomic structure with increasing fluence. 15,16 Analogous studies on dolomite have not been undertaken. Dolomite and calcite exhibit similar structures, wherein layers of carbonate ðCO 2À 3 Þ groups separate layers of different cations (Ca 2+ in calcite, or Ca 2+ and Mg 2+ in dolomite) (see Fig.…”

“…The FTIR spectra of these carbonate minerals revealed known major peaks at 1435-1450, 876-881, and 712-730 cm −1 and minor peaks at 2530-2550 and 1812-1818 cm −1 , 37 which are related to the stretching and bending modes of the CO 2À 3 groups. 15,37,38 The similarity in the atomic structures of dolomite and calcite is reflected in their FTIR spectra. Notably, the two major absorption peaks of dolomite (i.e., around 876-881 and 712-730 cm −1 ) lie between those of calcite and magnesite (MgCO 3 ).…”

HRTEM and FTIR investigation of nanosized zinc ferrite irradiated with 100MeV oxygen ions

“…Although these techniques are superior but restricted to only Fe ion or paramagnetic species in the system, however any technique based on the vibration modes of any system like Raman and Fourier Transform Infrared (FTIR) spectroscopy may throw more light on the irradiated system. Recent reports show that these techniques have been widely used for studying the irradiation induced effects in single crystals, cordierite [19,20], structural phase transition in materials induced by SHI irradiation [21][22][23], oxygen defects created during irradiation [24,25], etc. Available reports studying the irradiation induced effects in ferrites by these techniques indicate that various vibrational modes exhibit different sensitivities towards irradiation [26][27][28].…”

Pre and Post Effect of Swift Heavy Ion Irradiation on Infrared Spectral Evolution of Y₃₊<i>_x</i>Fe_5-<i>_x</i>O₁₂ (<i>x</i> = 0.0 - 1.0) System

“…Recent reports show that these techniques have been widely used for studying the irradiation induced effects on various class and different properties of materials [6][7][8]. Available reports indicate that various vibrational modes exhibit different sensitivity towards irradiation [9][10][11][12][13] but no discussion has been made on possible cause for such modifications [14].…”