Radiation stability of Gd₂Zr₂O₇: Effect of stoichiometry and structure

详细信息    查看全文

• 作者：Renu Kumari^a ; ^{renu.kumari678@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; P.K. Kulriya^a ; V. Grover^b ; R. Shukla^b ; K. Saravanan^a ; S. Mohapatra^c ; A.K. Tyagi^b ; D.K. Avasthi^a
• 关键词：Gd2Zr2O7 ; Swift heavy ions irradiation ; in-situ X-Ray diffraction ; Raman spectroscopy ; RRBS
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：42
• 期：1
• 页码：103-109
• 全文大小：1025 K

文摘

The dependence of radiation stability of Gd₂Zr₂O₇ on stoichiometry and structure under swift heavy ion irradiation was investigated. Gd₂Zr₂O₇, lies on the borderline of pyrochlore to fluorite phase transition, hence, it is highly sensitive to variations in the composition and/or synthesis conditions. The Gd₂Zr₂O₇ was synthesized in two sets (Set-A and -B) by solid state synthesis and gel combustion yielding different phases and stoichiometry as confirmed by Resonant Rutherford backscattering spectrometry (RRBS) and field emission scanning electron microscopy (FESEM). Both sets of Gd₂Zr₂O₇ were irradiated with 120 MeV Au ions with fluences varying from 3×10¹¹ to 1×10¹⁴ ions/cm². The pristine and irradiated samples were studied by X-ray diffraction (XRD) and Raman spectroscopy. The Set-A sample with pyrochlore structure remained crystalline upto the highest fluence 10¹⁴ ions/cm² employed, whereas Set-B sample having anion-deficient fluorite structure lost crystallinity at the fluence of 5×10¹³ ions/cm², as revealed by in-situ XRD experiment. The in-situ XRD along with Raman studies elucidated that sample synthesized using solid state reaction process exhibits better stability under swift heavy ion irradiation, implying that the sample with perfect stoichiometric pyrochlore structure possess better radiation stability.