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Liquid-like phase formation in Gd2Zr2O7 by extremely ionizing irradiation

Abstract : Isometric Gd2Zr2O7 with the ordered, pyrochlore structure has an extremely high resistance to radiation-induced amorphization. Ion-beam irradiations at keV to GeV energies result in a disordered, defect-fluorite structure that remains crystalline to very large fluences. However, we report liquid-like phase formation of droplet-like surface hillocks and quenched molten tracks in Gd2Zr2O7. The extremely high energy density of 12-MeV C60 clusters creates tracks with substantial volumes of amorphous material, accompanied by the formation of nanocrystals of the disordered, defect-fluorite structure. This is the first evidence of irradiation-induced amorphization of Gd2Zr2O7. In contrast, irradiation of Gd2Zr2O7 pyrochlore with swift heavy ions of U resulted in an order-disorder transformation to defect-fluorite without any evidence of amorphization. Thermal-spike calculations highlight the dominance of the effect of deposited energy density, controlled by the projectile velocity, as compared with the energy loss
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Contributor : Sophie Heurteau Connect in order to contact the contributor
Submitted on : Friday, October 16, 2009 - 2:26:07 PM
Last modification on : Thursday, October 21, 2021 - 5:11:58 AM



J. Zhang, M. Lang, J. Lian, J. Liu, C. Trautmann, et al.. Liquid-like phase formation in Gd2Zr2O7 by extremely ionizing irradiation. Journal of Applied Physics, American Institute of Physics, 2009, 105, pp.113510. ⟨10.1063/1.3124370⟩. ⟨in2p3-00424576⟩



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