Elastic moduli of pure and gadolinium doped ceria revisited: Sound velocity measurements

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• 作者：Nimrod Yavo^a ; David Noiman^b ; Ellen Wachtel^a ; Sangtae Kim^c ; Yishai Feldman^d ; Igor Lubomirsky^a ; ^{Igor.Lubomirsky@weizmann.ac.il" class="auth_mail" title="E-mail the corresponding author} ; Ori Yeheskel^b ; ^{OriYehe@gmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Gd-doped ceria ; Elastic properties ; Sound velocity ; Porosity
• 刊名：Scripta Materialia
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：123
• 期：Complete
• 页码：86-89
• 全文大小：653 K

文摘

The Young's, shear and bulk moduli of dense (> 95%) Gd-doped ceria (Ce_1 - xGd_xO_2 - x/2) ceramics were determined as a function of Gd content using the ultrasonic pulse-echo method and corrected for porosity according to both static and dynamic models. With increasing defect concentration (0–20 mol% Gd), the Young's and shear moduli decrease linearly by 10% while for 29 mol%, the values lie above the linear fit; the bulk modulus decreases linearly within the complete range. We conclude that structural changes, induced by oxygen vacancy ordering for x > 0.2, may influence the uniaxial and shear moduli, leaving the bulk modulus unaffected.