Cr Research Group, Department of Physics, University of Johannesburg, Johannesburg, South Africa.
Federal University of São Paulo, Santos, São Paulo, Brazil.
Luminescence. 2023 Mar;38(3):326-333. doi: 10.1002/bio.4455. Epub 2023 Feb 14.
Zr Ce O with x = 0.005, 0.01, 0.02, and 0.03 samples were synthesized using a combustion technique. The X-ray diffraction results revealed that Ce-doped ZrO nanoparticles were in a monoclinic structure up to 1 mol% Ce concentration. The increase in the Ce concentration caused more distortion in the monoclinic structure of zirconia. The samples showed a mixed phase (monoclinic + tetragonal) beyond 1 mol% Ce content. The crystallite size (D) and strain (ε) were calculated from the Williamson-Hall equation. The D decreased from 25 ± 1 to 20 ± 1 nm and ε increased from 0.03 to 0.28% with an increase in Ce concentration. Photoluminescence (PL) spectra of Zr Ce O showed emission in the blue region under an excitation wavelength of 290 nm. Zr Ce O showed the highest PL intensity with an average lifetime of 0.93 μs, and the PL intensity decreased with the increase in the Ce concentration. Thermoluminescence (TL) glow curves of Zr Ce O were measured after gamma irradiation (500 Gy) with a heating rate of 5 K s . The TL curve of Zr Ce O showed two prominent peaks at 412 K (peak 1) and 600 K (peak 2). The first TL glow peak was shifted towards a higher temperature at 440 K above 1 mol% Ce concentration. Repetitive TL measurements on the same aliquot exhibited excellent repeatability. Kinetic parameters associated with the TL peaks were calculated using the curve fitting method. Peak 1 followed non-first-order kinetics. The value of the activation energy of the 440 K peak was found to be 0.95 ± 0.01 eV for Zr Ce O . These findings showed that Zr Ce O might be used in lighting and radiation dosimeter applications.
采用燃烧技术合成了 x=0.005、0.01、0.02 和 0.03 的 ZrCeO 样品。X 射线衍射结果表明，Ce 掺杂的 ZrO 纳米颗粒在 1mol% Ce 浓度下呈单斜结构。Ce 浓度的增加导致氧化锆单斜结构的更多扭曲。超过 1mol% Ce 含量的样品显示出混合相（单斜+四方）。根据 Williamson-Hall 方程计算了晶粒尺寸（D）和应变（ε）。随着 Ce 浓度的增加，D 从 25±1 减小到 20±1nm，ε从 0.03 增加到 0.28%。ZrCeO 的光致发光（PL）光谱在 290nm 激发波长下显示出蓝色区域的发射。ZrCeO 具有最高的 PL 强度，平均寿命为 0.93μs，随着 Ce 浓度的增加，PL 强度降低。在 500Gy 的伽马辐照后，用 5K/s 的加热速率测量了 ZrCeO 的热致发光（TL）发光曲线。ZrCeO 的 TL 曲线在 412K（峰 1）和 600K（峰 2）处显示出两个明显的峰。在超过 1mol% Ce 浓度时，第一个 TL 发光峰向更高温度 440K 移动。对同一等分试样进行重复 TL 测量，表现出极好的重复性。使用曲线拟合法计算了与 TL 峰相关的动力学参数。峰 1 遵循非一级动力学。发现 440K 峰的激活能值为 0.95±0.01eV，用于 ZrCeO。这些发现表明，ZrCeO 可能用于照明和辐射剂量计应用。
