Crystal structure and magnetic behavior of novel R2PdIn8 (R = Pr, Nd, and Sm) compounds

A new series of R₂PdIn₈ intermetallics, where R = Pr, Nd, and Sm, was prepared by arc-melting the constituents under argon atmosphere and studied by means of X-ray diffraction and magnetic measurements. The compounds crystallize with a tetragonal structure of the Ho₂CoGa₈ type (space group P4/mmm). At very low temperatures, they order antiferromagnetically, and the Nd-based indide presumably exhibits an additional magnetic phase transition in the ordered region.     

稀土添加剂在硬质合金中的应用研究

对国内含稀土元素的硬质合金10多年来的研制情况及稀土元素对硬质合金组织和性能的影响进行了概述。     

Ce掺杂对TbFeCo材料磁光性能影响的研究

采用射频磁控溅射方法制备了TbFeCo非晶磁光薄膜，并在TbFeCo中引入轻稀土元素Ce，测试了薄膜的磁光性能。研究了薄膜成分对其磁光性能的影响。结果表明；在TbFeCo薄膜中掺入少量Ce时，薄膜的磁光克尔角及矫顽力都有所提高，矩形度也增加了。但随Ce掺入量的增加，薄膜的磁光性能发生恶化，较好的掺杂在10.31?左右。     

稀土在人棉灯芯绒直接染料染色中的应用

目前，稀土在化纤类，毛类纺织品染色中的应用比较成熟，而在棉类染色中的应用还未能得到推广，探讨稀土在直接染料对人棉灯芯绒织物染色中的作用机理，并从试验和生产方面加以比较，总结出本厂的成熟工艺。作者认为稀土对人棉灯芯绒织物在直接染料染色上应用是切实可行的，效果是理想的。     

Energy transfer and luminescence properties of Eu-doped NaTb(WO4)2 phosphor prepared by a facile hydrothermal method

NaTb_(1−x)Eu_x(WO₄)₂ (x = 0-100%) phosphors have been synthesized via a mild hydrothermal process directly without further sintering treatment. X-ray diffraction (XRD), scanning electron microscope (SEM), photoluminescence excitation and emission spectra and decay curve were used to characterize the samples. Moreover, the luminescence colors of NaTb_(1−x)Eu_x(WO₄)₂ (NTbW:Eu) samples can be tuned from green, green-yellow, and yellow to red by simply adjusting the relative Eu³⁺-doping concentrations under a single wavelength excitation, which might find potential applications in the light displays systems.     

稀土离子掺杂铝酸盐长余辉发光材料的研究进展

综述了长余辉发光材料的国内外研究进展，并以稀土离子激活的铝酸盐体系为例，从发光机理、合成方法和研究现状等方面进行了全面的分析。特别对飞秒激光诱导下的长余辉发光玻璃的研究情况进行了详细介绍，对发展前景和研究方向进行了展望。     

Crystal growth of rare-earth-doped ternary potassium lead chloride single crystals by the Bridgman method

High optical quality pure and rare-earth-doped ternary-potassium-lead-chloride (KPb₂Cl₅) single crystals have been grown using the Bridgman technique in a two-zone transparent vertical furnace. Combining the chlorination of the melt, to eliminate oxygen impurities, with a horizontal zone-refining, followed by the Bridgman growth itself using sealed silica ampoules, we successfully grew non-moisture-sensitive crystals of a high optical quality. The moisture content in the raw materials determines the quality of the resulting crystals.     

Electrical and magnetic properties of NdCuPb compound

Electrical and magnetic properties of NdCuPb compound were investigated by means of electrical resistivity, magnetization measurements in the temperature range 1.5–100 K. Low-field dc susceptibility goes through a maximum at T_N=13.2  K, indicating a paramagnetic to an antiferromagnetic transition and then follows a sharp peak at T=5.9  K. The susceptibility data exhibits a Curie–Weiss like behavior in the paramagnetic regime and the effective moment per neodium atom is found to be 3.62μ_B from the data at temperatures above 42 K. This value is exactly equal to that for Nd³⁺, while at lower temperatures, the data yields a little bit less than its free ion value. The ratio M/H versus temperature T curves for different values of the magnetic field split into multiple branches at about T=42  K due to crystalline field effects.In addition, electrical resistivity in a magnetic field up to 120 kOe was also measured in the same temperature range. The resistivity gives non-metallic behavior. The antiferromagnetic transition is clearly discern by a “Cr-like” anomaly at about 13 K, followed by a sharp increase in the resistivity (like a jump) at T=5.9  K where the susceptibility gives similar effect. On other hand, the magnetic contribution to the resistivity begins to decrease at T=42  K at which M/H curves merges. All these behavior may be attributed to crystal-field-splitting of neodium atoms’levels.     

Rare-earth diiodides and derivatives

The rare-earth diiodides, MI₂, may be synthesized from the corresponding triiodides, MI₃, by reduction with their metals at elevated temperatures or, alternatively, through so-called metallothermic reduction reactions with alkaline or alkaline-earth metals. In these cases, ternary iodides may be obtained that may be derived from the binary diiodides by either formal addition or substitution. Prominent formula types that are thus obtained are A^IMI₃, or the mixed-valent A^I₅M^II₂M^IIII₁₂ and A^IIMI₄ with A^I and A^II representing alkaline or alkaline-earth elements (and their analogues), respectively. Further iodides that are relevant in these systems are, for example, Pr₂I₅, Ba₆Pr₃I₁₉ and interstitially stabilized phases such as {Er₁₄(N₂)(C₂)₂}I₂₄, La₉O₄I₁₆ and Ba{Ce₄N₂}I₈.     

稀土加工助剂兼热稳定剂RHS—1

本文介绍一种新型无毒透明ＰＶＣ添加剂ＲＨＳ－１。ＲＨＳ－１的主要化学成分是一种难溶稀土有机酸盐，兼具加工助剂和热稳定剂的作用，作为加工助剂，其效能达到ＡＣＲ－２０１的二倍以上，ＲＨＳ－１的热稳定效能不及１７ＭＯＫ，但由于两者具体有协同作用，ＲＨＳ－１可用于代替部分１７ＭＯＫ。