Institute of Chemistry, University of Silesia in Katowice, 40-007 Katowice, Poland.
A. Chełkowski Institute of Physics, University of Silesia in Katowice, 40-007 Katowice, Poland.
Int J Mol Sci. 2024 Jul 19;25(14):7918. doi: 10.3390/ijms25147918.
A series of ZnCrHoSe microcrystalline spinels (where = 0.05, 0.075, and 0.10) containing holmium ions in octahedral coordination were obtained by sintering of adequate reactants at high temperatures. The obtained doped materials were characterized by X-ray diffraction, Scanning Electron Microscopy, UV-Vis-NIR, molecular field approximation, and XPS spectroscopies. Their thermal properties were also investigated. The doping of the ZnCrS matrix with paramagnetic Ho ions with a content of not more than 0.1 and a screened 4 shell revealed a significant effect of orbital and Landau diamagnetism, a strong reduction in short-range ferromagnetic interactions, and a broadening and shift of the peak of the first critical field by simultaneous stabilization of the sharp peak in the second critical field. These results correlate well with FPLO calculations, which show that Cr sites have magnetic moments of 3.19 µ and Ho sites have significantly larger ones with a value of 3.95 µ. Zn has a negligible magnetic polarization of 0.02 µ, and Se induces a polarization of approximately -0.12 µ.
一系列含有八面体配位Ho 离子的 ZnCrHoSe 微晶尖晶石（其中 = 0.05、0.075 和 0.10）是通过在高温下烧结适当的反应物获得的。所得掺杂材料通过 X 射线衍射、扫描电子显微镜、UV-Vis-NIR、分子场近似和 XPS 光谱进行了表征。还研究了它们的热性能。在 ZnCrS 基质中掺杂含量不超过 0.1 的顺磁 Ho 离子和屏蔽的 4 壳层显示出轨道和朗道抗磁性的显著影响、短程铁磁相互作用的强烈降低以及第一临界场的峰展宽和位移同时稳定第二临界场中的尖峰。这些结果与 FPLO 计算很好地相关，该计算表明 Cr 位具有 3.19 µ 的磁矩，而 Ho 位具有显著更大的磁矩，值为 3.95 µ。Zn 具有可忽略不计的磁极化率 0.02 µ，而 Se 诱导约-0.12 µ 的极化率。
