کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1683679 1010511 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Swift heavy ion induced structural modifications in zircon and scheelite phases of ThGeO4
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سطوح، پوشش‌ها و فیلم‌ها
پیش نمایش صفحه اول مقاله
Swift heavy ion induced structural modifications in zircon and scheelite phases of ThGeO4
چکیده انگلیسی

Structural modifications in the zircon and scheelite phases of ThGeO4 induced by swift heavy ions (93 MeV Ni7+) 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 ThGeO4 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 × 1016 ions/m2), as compared to that at room temperature (6 × 1017 ions/m2). Scheelite type ThGeO4 irradiated at room temperature undergoes complete amorphization at a lower fluence of 7.5 × 1016 ions/m2 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 ThGeO4 are, 3.9, 3.5 and 4.5 nm, respectively. X-ray structural investigations on the zircon phase of ThGeO4 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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 268, Issue 1, 1 January 2010, Pages 42–48
نویسندگان
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