Rada S, Zhang J, Rada R, Culea E
Physics and Chemistry Department, Technical University of Cluj-Napoca, 400641, Cluj-Napoca, Romania; National Institute for Research and Development of Isotopic and Molecular Technologies, 400293, Cluj-Napoca, Romania.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, People's Republic of China.
J Mech Behav Biomed Mater. 2022 Oct;134:105425. doi: 10.1016/j.jmbbm.2022.105425. Epub 2022 Aug 22.
The samples 8YSZ containing 70, 75, 80 mol% ZrO and other oxides were prepared by. a high temperature solid state reaction process. Using X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and spectroscopic methods were evaluated the effect of oxide addition on the properties of yttria-doped zirconia. X-ray data shows the formation of zirconia (Y-doped), YSZ and/or tetragonal zirconia crystalline phases in all samples. IR data indicate the stretching vibrations of the Si-O bonds from tetrahedral [SiO] units and the stretching vibrations of the Fe-O bonds from [FeO] structural units, respectively. EPR results indicate the destroying of the local ordering of the Fe ion vicinities situated in the rhombic distorted octahedral geometries by the increasing of ZrO content in the host ceramic. The highest values of Vickers hardness were recorded for the ceramics containing 70 and 75 mol% ZrO. This superior performance can be explained considering the presence of a smaller amount of monoclinic ZrO crystalline phase in the ceramic structure. The analysis of the X-ray Absorption Near Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS) data shows the presence of Fe and Fe ions. In the ceramics with higher ZrO contents the iron atoms adopt a randomly structure due to the highly distorted [FeO] structural units and non-equivalent Fe-O distances in the first coordination shell.
通过高温固态反应工艺制备了含有70、75、80摩尔%氧化锆及其他氧化物的8YSZ样品。使用X射线衍射（XRD）、扫描电子显微镜（SEM）和光谱方法评估了添加氧化物对钇掺杂氧化锆性能的影响。X射线数据显示所有样品中均形成了氧化锆（钇掺杂）、YSZ和/或四方氧化锆晶相。红外数据分别表明了来自四面体[SiO]单元的Si - O键的伸缩振动和来自[FeO]结构单元的Fe - O键的伸缩振动。电子顺磁共振（EPR）结果表明，随着主体陶瓷中氧化锆含量的增加，位于菱形畸变八面体几何结构中的铁离子附近的局部有序性被破坏。含70和75摩尔%氧化锆的陶瓷记录到了最高的维氏硬度值。考虑到陶瓷结构中存在较少量的单斜氧化锆晶相，可以解释这种优异性能。对X射线吸收近边结构（XANES）和扩展X射线吸收精细结构（EXAFS）数据的分析表明存在铁和亚铁离子。在氧化锆含量较高的陶瓷中，由于[FeO]结构单元高度畸变且第一配位层中的Fe - O距离不等价，铁原子呈现出随机结构。
