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Characterisation of conductivity of the (Ce xY0.2-x)Sc0.6 Zr3.2O8-δ (0 < x < 0.2) system and composition Ce0.04Y0.02Sc0.67Zr3.27O 7.66 as function of time

التفاصيل البيبلوغرافية
العنوان: Characterisation of conductivity of the (Ce xY0.2-x)Sc0.6 Zr3.2O8-δ (0 < x < 0.2) system and composition Ce0.04Y0.02Sc0.67Zr3.27O 7.66 as function of time
المؤلفون: Carvalho, E. de, Irvine, J. T. S.
المصدر: Cerâmica. March 2012 58(345)
بيانات النشر: Associação Brasileira de Cerâmica, 2012.
سنة النشر: 2012
مصطلحات موضوعية: scandia-zirconia, ac impedance, ageing
الوصف: The conductivity behaviour of the (Ce xY0.2-x)Sc0.6 Zr3.2O8-δ (0 < x < 0.2) system and composition Ce0.04Y0.02Sc0.67Zr3.27O 7.66 have been investigated as function of time using impedance spectroscopy. All samples were prepared by sol-gel and combustion process, sintered at 1500 °C for 12 h and the densities obtained were between 92 and 97%. The electrical measurements were performed at 600 °C. The conductivity values were fairly stable during the first 1800 h of the experiment but after this time the conductivity decreases. For some compositions of the system a semi-circle is detected through time, with capacitance values of an order of magnitude lower, 10-8 F/cm. This semi-circle becomes well defined with time. After the experiment, SEM pictures show that grain boundary is well defined and an increase of pore inside grains, in some cases the surface is damaged showing cracks and fissures indicating microstructure deterioration.
نوع الوثيقة: article
وصف الملف: text/html
اللغة: English
تدمد: 0366-6913
DOI: 10.1590/S0366-69132012000100002
URL الوصول: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132012000100002
Rights: info:eu-repo/semantics/openAccess
رقم الانضمام: edssci.S0366.69132012000100002
قاعدة البيانات: SciELO
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