Abstract
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 27.44nm when the ZrO2–3Y2O3–1SrO precursor powders after calcination at 823K from 15 to 120min. The activation energy values obtained are 9.98, 9.04 and 7.43kJ/mol for SrO addition amount of 1, 2 and 3mol%, respectively, and the kinetics equations of t-ZrO2 crystalline growth with SrO addition are also expressed as follows: D1SrO2=6.00×t0.13exp(−9.98×103RT),D2SrO2=6.02×t0.11exp(−9.04×103RT) and D3SrO2=6.13×t0.10exp(−7.43×103RT) with SrO content for 1, 2 and 3mol%, respectively, for 15≤t≤120min and 773≤T≤923K.
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