Effect of SrO addition on the growth behavior of ZrO₂-3Y₂O₃ precursor powders synthesized by a coprecipitation process

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• 作者：Hsueh-Liang Chu^a ; Weng-Sing Hwang^a ; ^b ; Je-Kang Du^c ; ^d ; Ker-Kong Chen^c ; ^d ; ^{enamel@kmu.edu.tw" class="auth_mail" title="E-mail the corresponding author} ; Moo-Chin Wang^e ; ^{mcwang@kmu.edu.tw" class="auth_mail" title="E-mail the corresponding author}
• 关键词：SrO&ndash ; ZrO2 ; Crystalline growth kinetics ; Activation energy
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：42
• 期：8
• 页码：10251-10258
• 全文大小：3054 K

文摘

Effect of SrO addition on the crystalline growth behavior of ZrO₂–3Y₂O₃ precursor powders using a coprecipitation process has been studied. Zirconium nitrate (Zr(NO₃)₄·xH₂O), yttrium nitrate (Y(NO₃)₃·6H₂O) and strontium nitrate (Sr(NO₃)₂) were used as the initial materials. Crystalline growth behavior was investigated using X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), nano beam electron diffraction (NBED) and high-resolution TEM (HRTEM). The XRD results showed the ZrO₂–3Y₂O₃–xSrO only contained single phase of tetragonal ZrO₂ (t-ZrO₂) when the precursor powders were calcined at different temperatures for various durations. The crystallite size increased from 22.91 to 27.44 nm when the ZrO₂–3Y₂O₃–1SrO precursor powders after calcination at 823 K from 15 to 120 min. The activation energy values obtained are 9.98, 9.04 and 7.43 kJ/mol for SrO addition amount of 1, 2 and 3 mol%, respectively, and the kinetics equations of t-ZrO₂ crystalline growth with SrO addition are also expressed as follows: $D_{\mathrm{1SrO}}^2=6.00\times t^{0.13}\exp (-\frac{9.98\times {10}^3}{RT}),D_{\mathrm{2SrO}}^2=6.02\times t^{0.11}\exp (-\frac{9.04\times {10}^3}{RT})$ and $D_{\mathrm{3SrO}}^2=6.13\times t^{0.10}\exp (-\frac{7.43\times {10}^3}{RT})$ with SrO content for 1, 2 and 3 mol%, respectively, for 15≤t≤120 min and 773≤T≤923 K.