The Temperature Dependence of the Relative Grain-Boundary Energy of Yttria-doped Alumina
The Temperature Dependence of the Relative Grain-Boundary Energy of Yttria-doped Alumina
复制标题
掺钇氧化铝的相对晶界能的温度依赖性
DOI：
10.1111/jace.14488
复制
发表时间：
2017
影响因子：
3.9
通讯作者：
G. Rohrer
中科院分区：
文献类型：
--
作者：
M. Kelly;S. Bojarski;G. Rohrer
使用原子力显微镜测量在1350°C和1650°C之间的温度下加热的Al2O3、100 ppm Y掺杂的Al2O3和500 ppm Y掺杂的Al2O3陶瓷表面上的晶界热凹槽的尺寸。测量被用来估计作为温度的函数的相对晶界能。Al_2O_3的相对晶界能随温度的升高略有下降。当掺杂样品被加热时，晶界能总体上增加，这归因于在较高温度下晶界过剩的减少。晶界能增加的总体趋势在1450°C和1550°C之间被晶界能的突然降低所打断。在相同的温度范围内，有一个突然增加的晶界流动性，这是与肤色转变。当100 ppm Y掺杂样品冷却时，在相同的复合转变温度下，相对晶界能相应增加，表明该转变是可逆的。
Atomic force microscopy was used to measure the dimensions of grain-boundary thermal grooves on the surfaces of Al2O3, 100 ppm Y-doped Al2O3, and 500 ppm Y-doped Al2O3 ceramics heated at temperatures between 1350°C and 1650°C. The measurements were used to estimate the relative grain-boundary energies as a function of temperature. The relative grain-boundary energies of Al2O3 decrease slightly with increased temperature. When the doped samples were heated, there was an overall increase in the grain-boundary energy, attributed to a reduction in the grain boundary excess at higher temperature. The overall trend of increasing grain-boundary energy was interrupted by abrupt reductions in grain-boundary energy between 1450°C and 1550°C. In the same temperature range, there is an abrupt increase in the grain-boundary mobility that is associated with a complexion transition. When the 100 ppm Y-doped sample was cooled, there was a corresponding increase in the relative grain-boundary energy at the same complexion transition temperature, indicating that the transition is reversible.