Electron microscopic study of a newly formed Eu2MnZrO7 − δ with a fluorite-related type structure

Pyrochlore is an important nuclear waste form phase for actinide immobilization. Two synthetic pyrochlores, Gd2Ti2O7 and Gd2Zr2O7 were irradiated at various temperatures (25 K to 1073 K) by different ion species (1.5 MeV Xe+, 1.0 MeV Kr+, and 0.6 MeV Ar+). The titanate pyrochlore amorphized at relatively low doses (0.5 ∼ 0.6 dpa). Temperature dependence of the amorphization dose for titanate pyrochlore was measured, and the critical temperatures for amorphization were 1300 K, 1100 K and 950 K by 1.5 MeV Xe+, 1.0 MeV Kr+ and 0.6 MeV Ar+, respectively. The higher critical temperature for the heavier ion irradiation is consistent with an amorphization mechanism by which the heavier ion produces a larger cascade. The zirconate pyrochlore, Gd2Zr2O7, showed a strong amorphization “resistance”. Gd2Zr2O7did not become amorphous under 1.0 MeV Kr+ and 1.5 MeV Xe+ irradiation. After prolonged irradiation (up to 7 dpa) even at a temperature of 25 K, no amorphization was observed. The irradiated zirconate pyrochlore showed abundant dislocations as observed by TEM. The pyrochlore structure of Gd2Zr2O7 transformed to the fluorite structure after irradiation. The diffraction patterns of irradiated Gd2Zr2O7 showed the existence of short-range ordering of cations. The large difference between these two pyrochlores emphasizes the strong effect of chemical composition on radiation-induced amorphization.

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Electron microscopic study of a newly formed Eu2MnZrO7 − δ with a fluorite-related type structure

Cited by 2 publications

References 14 publications

Electron microscopy study of a manganese-doped holmium zirconium oxide solid solution

Electron microscopy study of a manganese-doped holmium zirconium oxide solid solution

Ion Irradiation Effects for Two Pyrochlore Compositions: Gd₂Ti₂O₇and Gd₂Zr₂0₇

Contact Info

Product

Resources

About

Electron microscopic study of a newly formed Eu2MnZrO7 − δ with a fluorite-related type structure

Cited by 2 publications

References 14 publications

Electron microscopy study of a manganese-doped holmium zirconium oxide solid solution

Electron microscopy study of a manganese-doped holmium zirconium oxide solid solution

Ion Irradiation Effects for Two Pyrochlore Compositions: Gd2Ti2O7and Gd2Zr207

Contact Info

Product

Resources

About

Ion Irradiation Effects for Two Pyrochlore Compositions: Gd₂Ti₂O₇and Gd₂Zr₂0₇