Growth kinetics of tetragonal and monoclinic ZrO2 crystallites in 3 mol% yttria partially stabilized ZrO2 (3Y-PSZ) precursor powder
Growth kinetics of tetragonal and monoclinic ZrO2 crystallites in 3 mol% yttria partially stabilized ZrO2 (3Y-PSZ) precursor powder
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DOI：
10.1016/j.jallcom.2014.01.019
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发表时间：
2014-04
影响因子：
6.2
通讯作者：
Chih-Wei Kuo;K. Lee;F. Yen;Yun-Hwei Shen;Huey-Er Lee;S. Wen;Moo-Chin Wang;M. Stack
中科院分区：
文献类型：
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作者：
Chih-Wei Kuo;K. Lee;F. Yen;Yun-Hwei Shen;Huey-Er Lee;S. Wen;Moo-Chin Wang;M. Stack
用X射线衍射仪、BET比表面积分析、透射电子显微镜和高分辨电子显微镜研究了3摩尔%Y部分稳定的前驱体粉末中四方和单斜相的ZrO2晶体的生长动力学。3Y-PSZ前驱体粉末在773K~1073K焙烧2 h后，其晶体结构由四方相和单斜相分别为第一相和第二相。当3Y-PSZ前驱体粉末在773K下焙烧2 h时，BET比表面积为97.13m2/g，相当于10.30 nm的粒径。X-射线衍射仪和比表面积测试仪测得的微晶尺寸吻合较好，表明粉末基本上是无团聚的。3Y-PSZ前驱体粉末中四方和单斜相的生长动力学方程分别为：DTe2=(4.57±0.55)t0.12±0.02exp(-24.79±0.38)×103RT和Dm2=(4.40±1.63)t0.17±0.08exp(-66.47±3.97)×103RT，773K≤T≤1073K.Dte和Dm分别表示时间t和温度T时四方和单斜相的微晶尺寸。
The growth kinetics of tetragonal and monoclinic ZrO 2 crystallites in 3 mol% yttria partially stabilized ZrO 2 (3Y-PSZ) precursor powder has been investigated using X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) specific surface area analysis, transmission electron microscopy (TEM) and high resolution TEM (HRTEM). After calcination of the 3Y-PSZ precursor powder between 773 and 1073 K for 2 h, the crystalline structures were composed of tetragonal and monoclinic ZrO 2 as the primary and secondary phases, respectively. When the 3Y-PSZ precursor powder was calcined at 773 K for 2 h, the BET specific surface area was 97.13 m 2/g, which is equivalent to a particle size of 10.30 nm. The crystallite sizes determined via XRD and BET agreed well, indicating that the powder was virtually non-agglomerated. The growth kinetics of tetragonal and monoclinic ZrO 2 crystallite isothermal growth in the 3Y-PSZ precursor powder are described by: D te 2=(4.57±0.55) t 0.12±0.02 exp (-(24.79±0.38)× 10 3 RT) and D m 2=(4.40±1.63) t 0.17±0.08 exp (-(66.47±3.97)× 10 3 RT), respectively, for 773 K≤ T≤ 1073 K. D te and D m denote the crystallite size of tetragonal and monoclinic ZrO 2 at time t and temperature T, respectively.