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| 1 | Effect of thulium substitution on conductivity and dielectric belongings of nanospinel cobalt ferrite显示文摘The CoTmx Fe2-x O4(x≤0.1) NPs were synthesized sonochemically.X-ray powder diffraction patterns and TEM images of the samples prove their chemical purity and cubic structure-morphology,respectively.Some substitution ratio of thulium ions to cobalt ferrites have an important effect on the characteristic evaluation of both electrical and dielectric characteristic measured at frequencies up to 3.0 MHz between room temperature and 120℃.Since the thulium substitution has a very strong effect on the characteristic evaluation of both electrical and dielectric properties of cobalt-ferrite samples,four substitutio nal ranges-none,small,medium and high were determined for the interpretation of contribution of thulium ratio to ac/dc conductivity,dielectric constant,dielectric loss and tangent loss.Conductivity increases with the incremental frequencies,in general depending on a variety of tendencies of both temperature and substitutional Tm ratios while the activation energy varies with a high dependency to the regional level of Tm substitution in Co-ferrites NPs.The Arrhenius graph appears to provide us with a single activation energy much higher than 400 meV for x=0.02,which can be attributed to electron hopping mechanisms,apart from other substituted spinel ferrites. | B.Unal M.A Almessiere A.Demir Korkmaz Y.Slimani A.Baykale | 2020 | Journal of Rare Earths2020，38，10： | 2 |
| 2 | Gd^(3+)掺杂铁氧体吸波材料的制备及性能研究显示文摘运用电磁吸波材料是解决电磁辐射/干扰难题和提升武器装备隐身性能的有效手段。基于掺杂诱导作用调控电磁特性的策略,以稀土离子钆(Gd^(3+))为掺杂离子,采用溶剂热法制备Gd^(3+)掺杂铁氧体(GdxFe3-xO4)磁性吸波材料,并探究Gd^(3+)掺入量对材料微观结构、磁性能和吸波性能的影响。结果表明:Gd^(3+)的掺入对产物晶型和微观形貌影响不显著,磁性颗粒尺寸随着Gd^(3+)掺入量的增加而减小。适量Gd^(3+)的掺入可以提高材料的磁性能,Gd0.04Fe2.96O4的饱和磁化强度达66.49emu/g。此外,当在基体填充率为70%时,最大反射损耗为-47.25dB,有效吸收带宽为5.94GHz,这表明GdxFe3-xO4磁性材料有望成为一种极具应用价值的电磁吸波材料。 | 苏晓岗 王君 韩孟杰 刘亚青 | 2023 | 化工新型材料2023，51，11： | 0 |
| 3 | Effect of anionic group[SiO_(4)]^(4-)/[PO_(4)]^(3-) on the luminescence properties of Dy^(3+)-doped tungstate structural compounds显示文摘Novel scheelite structures of Li_(2)Ca(WO_(4))_(2),Li_(2)Ca_(2)(WO_(4))(SiO_(4)),and LiCa_(2)(WO_(4))(PO_(4))fluorescent materials were successfully prepared using a high-temperature solid-phase process.The compounds were characterized by X-ray diffraction and energy dispersive spectroscopy.The tests revealed that the substitution of[WO_(4)]^(2-)by[SiO_(4)]^(4-) or [PO_(4)]^(3-) tetrahedron in tungstate had no significant influence on the crystal structure of the Li_(2)Ca(WO_(4))_(2).When Dy^(3+) ions were introduced as an activator at an optimum doping concentration of 0.08 mol%,all of the as-prepared phosphors generated yellow light emissions,and the emission peak was located close to 576 nm.Replacing[WO_(4)]^(2-) with [SiO_(4)]^(4-) or [PO_(4)]^(3-) tetrahedron significantly increased the luminescence of the Li_(2)Ca(WO_(4))_(2) phosphors.Among them,the LiCa_(2)(WO_(4))(PO_(4)):0.08Dy^(3+) phosphor had the best luminescence properties,decay life(r=0.049 ms),and thermal stability(87.8%).In addition,the as-prepared yellow Li_(2)Ca(WO_(4))_(2):0.08Dy^(3+),Li_(2)Ca_(2)(WO_(4))(SiO_(4)):0.08Dy^(3+),and LiCa_(2)(WO_(4))(PO_(4)):0.08Dy^(3+) phosphor can be used to fabricate white light emitting diode(LED)devices. | Ning LIU Lefu MEI Jianxiong BIN Ze ZHANG Zhijian PENG | 2021 | Journal of Advanced Ceramics2021，10，4： | 0 |
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