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Swift heavy ion induced structural modifications in zircon and scheelite phases of ThGeO(4)

Abstract : Structural modifications in the zircon and scheelite phases of ThGeO(4) induced by swift heavy ions (93 MeV Ni(7+)) at different fluences as well as pressure quenching effects are reported. X-ray diffraction and Raman measurements at room temperature on the irradiated zircon phase of ThGeO(4) indicate the occurrence of stresses that lead to a reduction of the cell volume up to 2% followed by its transformation to a mixture of nano-crystalline and amorphous scheelite phases. Irradiation of the zircon phase at liquid nitrogen temperature induces amorphization at a lower fluence (7.5 x 10(16) ions/m(2)), as compared to that at room temperature (6 x 10(17) ions/m(2)). Scheelite type ThGeO(4) irradiated at room temperature under goes complete amorphization at a lower fluence of 7.5 x 10(16) ions/m(2) without any volume reduction. The track radii deduced from X-ray diffraction measurements on room temperature irradiated zircon, scheelite and low temperature irradiated zircon phases of ThGeO(4) are, 3.9, 3.5 and 4.5 nm, respectively. X-ray structural investigations on the zircon phase of ThGeO(4) recovered after pressurization to about 3.5 and 9 GPa at ambient temperature show the coexistence of zircon and disordered scheelite phases with a larger fraction of scheelite phase occurring at 9 GPa. on the other hand, the scheelite phase quenched from 9 GPa shows crystalline scheelite phase pattern. (c) 2009 Elsevier B.V. All rights reserved.
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Submitted on : Tuesday, February 14, 2012 - 2:14:36 PM
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M. K. Patel, D. K. Avasthi, P. K. Kulriya, S. Kailas, J. C. Pivin, et al.. Swift heavy ion induced structural modifications in zircon and scheelite phases of ThGeO(4). Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Elsevier, 2010, 268, pp.42-48. ⟨10.1016/j.nimb.2009.09.026⟩. ⟨in2p3-00670052⟩



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