Study on F-F Transitions of Powdered Neodymium Compounds by Photoacoustic Spectroscopy

ＴｈｅｐｈｏｔｏａｃｏｕｓｔｉｃｅｆｆｅｃｔｗａｓｆｉｒｓｔｏｂｓｅｒｖｅｄａｂｏｕｔａｃｅｎｔｕｒｙａｇｏｂｙＢｅｌｌＡＧ .Ｉｔｓａｐｐｌｉｃａ ｔｉｏｎｓｔｏｇａｓｅｏｕｓａｎａｌｙｓｉｓｈａｖｅｂｅｅｎｎｕｍｅｒｏｕｓ .Ａｕｓｅｆｕｌｌａｂｏｒａｔｏｒｙｉｎｓｔｒｕｍｅｎｔｓｕｉｔａｂｌｅｆｏｒｔｈｅｉｎｖｅｓｔｉｇａｔｉｏｎｏｆｓｐｅｃｔｒａｌｐｒｏｐｅｒｔｉｅｓｏｆｔｈｅｒｍａｌｌｙｔｈｉｃｋｓａｍｐｌｅｓｗａｓ ,ｈｏｗｅｖｅｒ ,ｏｎｌｙｄｅｖｉｓｅｄｄｕｒ ｉｎｇｔｈｅ 1 970′ｓ .Ｓｏ…     

稀土色剂和釉瓷的光声光谱研究

光声光谱适于研究不透明、高反射、高散射的稀土色剂和釉瓷的光学性质。本文测定了Ｐｒ－Ｚｒ黄、Ｐｒ－Ｖ－Ｚｒ绿、Ｎｄ－Ｚｒ紫色剂和釉瓷的光声光谱，探讨了稀土离子的存在状态和着色机理，提出以谱图作为确定色调和判断质量的客观依据。     

稀土有机配合物发光及光声光谱研究方法

简要综述了稀土有机配合物发光研究的进展。光声光谱从无辐射的新角度对这一领域进行研究，结果表明：光声光谱能简便而有效地反映稀土离子的能级状况，确定能级的荧光性质，根据光声光谱的振幅和位相谱，可了解稀土配合物发光的能量传递和弛豫途径。     

稀土对聚氯乙烯塑料降解的共轭作用的光声光谱研究

通过对稀土作用下PVC降解的光声光谱研究,分析了在稀土作用下PVC降解的共轭分布情况,结果表明,稀土PVC热稳定剂具有良好稳定性和初色性能。     

P507煤油萃取剂体系溶解碳酸镨钕研究

为简化离子型稀土矿提取稀土工艺,采用离子交换树脂富集矿山浸出母液技术制备高纯碳酸稀土用于有机溶料,系统考察了P507煤油萃取剂体系溶解碳酸镨钕过程中,碳酸镨钕预处理方式、碳酸镨钕加入量、水相pH、杂质铝含量、反应时间和相比等因素对萃取效果的影响。结果表明,以湿碳酸镨钕为原料,其加入量控制为有机相负载稀土浓度0.16~0.18 mol/L,水相pH=2.0~3.0,相比O/A=1,反应时间12 min,碳酸镨钕中的铝含量小于2.5%,30 ℃条件下,碳酸镨钕溶解完全,分相效果好,有机相中稀土浓度达0.177 1 mol/L,萃取率为98.13%。采用4级逆流连续萃取试验,经16次反应平衡后有机相出口级稀土浓度为0.166 8 mol/L,水相出口稀土浓度为0.001 1 mol/L。采用P507-煤油萃取剂体系溶解碳酸镨钕同步实现了空白有机相的皂化及萃取过程,碳酸稀土直接作为原料省略了酸分解工序,缩短了工艺流程,同时用作皂化剂,降低了化工材料消耗、废水排放量及环保成本,为简化稀土萃取分离提供了应用基础。     

铒氨基酸固态配合物的光声光谱研究

合成了Er(Gly)3Cl3·3H2O、Er(Ala)3Cl3·3H2O和Er(Gly)3Phen·3H2O二元及三元固态配合物微晶粉末,在300nm～800nm范围内测定并解释了其光声光谱。通过对光声相对强度计算得到铒氨基酸固态配合物的光声支量,讨论了氨基酸配体对中心稀土离子铒f-f跃迁的微扰作用。结合Er(Ala)3Cl3·3H2O配合物的光声光谱和吸收光谱研究了其荧光性质及弛豫模型。     

CeO_2纳米薄膜的光声光谱研究

本文以Ｃｅ（ＮＯ３）３·６Ｈ２Ｏ为前驱物，火棉胶为添加剂，用ｓｏｌ－ｇｅｌ提拉法制备ＣｅＯ２透明薄膜。本方法成膜均匀，重复性好。薄膜的结晶性质和光谱性质研究表明，薄膜中ＣｅＯ２为纳米粒径，具有强烈的量子尺寸效应和表面效应。     

Studies on Intermolecular Energy Transfer and Relaxation Processes in Solid Rare Earth Complexes by Photoacoustic Spectroscopy

Ｍｕｃｈａｔｔｅｎｔｉｏｎｈａｓｂｅｅｎｐａｉｄｔｏｒａｒｅｅａｒｔｈｃｏｍｐｌｅｘｅｓｂｅｃａｕｓｅｏｆｔｈｅｉｒｐａｒｔｉｃｕｌａｒｌｕｍｉｎｅｓ ｃｅｎｃｅｐｒｏｐｅｒｔｉｅｓ .Ｔｈｅｙｈａｖｅｏｆｔｅｎｂｅｅｎｕｓｅｄｆｏｒｌａｓｅｒｍａｔｅｒｉａｌｓａｎｄｌｕｍｉｎｅｓｃｅｎｃｅｐｒｏｂｅｓｉｎｆｌｕｏｒｏｉｍｍｕｎｏａｓｓａｙａｎｄｓｏｏｎ .[1] .Ｒａｒｅｅａｒｔｈｉｏｎｓｗｉｔｈｐｅｃｕｌｉａｒ 4ｆｃｏｎｆｉｇｕｒａｔｉｏｎ ,ｓｕｃｈａｓＬａ3 ,Ｇｄ3 ,Ｌｕ3 ｏｒＹ3 ,ｃａｎｃｏｎｓｉ…     

高炉转型稀土渣盐酸化选除杂工艺研究

稀土转型渣经过化学选矿,在合适的酸度、反应时间和固液比等条件下,稀土渣品位由18.6%提高到31%左右,稀土收率大于98%。     

Relaxation process and phase transition of lanthanide liquid crystalline complexes by photoacoustic spectroscopy

Lanthanide-containing liquid crystals exhibiting smectic A phase close to room temperature were obtained. Photoacoustic （PA） spectroscopy was used to study the spectral properties and phase transitions of liquid crystalline metal complexes. It was found that PA intensity of the ligand had a relationship with the probability of nonradiative transitions, which increased in the order of Eu（tta）3L2〈La（tta）3L2〈 Tb（tta）3L2〈Er（tta）3L2. The relaxation processes of the complexes were studied in depth from two aspects： radiative and non-radiative processes, combining with their fluorescence spectra. Phase transitions of europium（m） and erbium（m） complexes, in the temperature range of 383-358 K, could be clearly monitored by both PA amplitude and PA phase signals. As the temperature crossed the transition point, PA amplitude showed a minimum and PA phase a maximum. The results indicated that PA technique could serve as a new tool for investigating the physicochemical properties of liquid crystals containing metal ions.     

Study on Mechanism of Rare Earth PVC Stabilizer

Rare earth compounds can be used as PVC thermal stabilizers. According to the infrared spectra of the mixture of PVC and some stearates, the mechanism of stabilization of different stearates was studied. The specialty of rare earth stabilizers was found. They can change the conformation of PVC and restrain the elimination of HCI. From this aspect, the unique synergetic effect with other stabilizers of rare earth compounds can be explained.     

Study on Copolymerization of Rare Earth－Carboxylic Acid Complex

Complex of rare earth with carboxylic acid was prepared by precipitation and direct method. It was copolymerized with such monomers as acrylic acid and other ones to synthesize ionomer of rare earth and organic polymer with different rare earth contents. Its glass-transition temperature and heat stability were analyzed by TG and DTA. Infra-red detector was used to show its structure. The effect of rare earth complex prepared by different methods on copolymerization and properties of copolymers was also discussed.     

Study on Separation of Lanthanum from Praseodymium Complexes with IMDA by Gel and Macroporous Anion Exchangers

Ｍａｎｙｓｔｕｄｉｅｓｈａｖｅｂｅｅｎｍａｄｅｏｎｔｈｅｓｅｐａｒａｔｉｏｎｏｆｒａｒｅｅａｒｔｈｅｌｅｍｅｎｔｓｕｓｉｎｇｓｏｌｖｅｎｔｅｘｔｒａｃｔｉｏｎａｎｄｉｏｎｅｘｃｈａｎｇｅ[1].Ｓｉｎｃｅｔｈｅａｆｆｉｎｉｔｙｓｅｒｉｅｓｏｆｒａｒｅｅａｒｔｈｅｌｅｍｅｎｔｓｆｏｒｃａｔｉｏｎ-ｅｘｃｈａｎｇｅｒｓａｒｅｖｅｒｙｓｉｍｉｌａｒ,ａｓｅｐａｒａｔｉｏｎｂｙｅｌｕｔｉｏｎｗｉｔｈｉｎｏｒｇａｎｉｃａｃｉｄｓｉｓａｌｍｏｓｔｉｍｐｏｓｓｉｂｌｅ.Ｈｏｗｅｖｅｒ,ｇｏｏｄｒｅｓｕｌｔｓｃａｎｂｅ…     

Study on Preparation and Property of Poly－Aminosilicone－Rare Earth Composite

The poly-aminosilicone-rare earth composite was prepared by poly-aminosilicone cross-linked with rare earth and active silanol. The thermal stability of the composites was studied by thermogravimetric analysis (TG). Force condition of the composites in electric field was analyzed and relative polarizability was derived. It is found that the composites containing different rare earth ions have different relative polarizability. The experiment results reveal that organosilicon materials with different electrical performance can be obtained by this way. Meanwhile, the absorption and flourescene spectrum of composites were also investigated. Compared to rare earth chloride, the spectrum properties of the composite are changed obviously. The possible reasons for these phenomena were discussed.     

Interaction between Ternary Rare Earth Complexes of Cinnamic Acid and Phenanthroline with DNA by Spectroscopy

Considerableattentionshavebeenpaidtothe salicylicacid,theendogenoussignalmoleculein plant,becauseofitsspecialbiologicalfunctionsin manybiologicalprocesses[1].Someinvestigations havedemonstratedthatsalicylicacidcaneliminatethebiologicalfreeradicals,andprot…     

负载有机稀土草酸溶液直接沉淀生产工艺研究

有关负载有机稀土草酸溶液直接沉淀工艺的研究,已见一些报道,但大都停留在实验室研究基础上。其一,用该工艺方法直接沉淀得到的稀土氧化物一般总量较低,达不到产品总量要求(>99%)。其二,对于重稀土的沉淀,则需要大量过量沉淀剂才能沉淀完全,而过量沉淀剂必须回收循环使用,对于过量沉淀剂回收循环使用的研究未见报道。本文针对该工艺方法存在的问题进行了实验研究,并得到了较好的结果。     

低C、O含量氟化稀土的制备工艺研究

以氯化钇为原料,采用碳酸氢铵制备的碳酸盐,通过复合氟化剂转化生成氟化钇,经过烘干和粒子整合之后得到无水氟化钇。考察了碳酸盐晶体质量、复合氟化剂的配比和浓度、反应温度、稀土浓度、pH值等对稀土氟化物中C、O含量的影响。结果表明:在选定条件下,用复合氟化剂将碳酸钇晶体转化生成氟化稀土,可明显降低氟化稀土中C、O的含量。     

几种有机酸对花岗岩风化壳中稀土元素的浸出作用的实验研究

几种有机酸对广东共和花岗岩风化壳样品中稀土元素的浸泡实验结果表明 :1稀土的浸出量随酸浓度的增加而明显升高 ;2低浓度的有机酸对稀土的浸出量随着水岩比的增加而增加 ;3有机酸与风化壳样品的作用结果导致介质的 p H值会发生变化 ,大多数是 p H值升高 ;稀土的浸出量随着 p H降低有升高的趋势 ;4与硫酸铵所浸出的稀土相比 ,有机酸对风化壳稀土的浸出结果是 Ce负异常减弱 ,Eu负异常增加 ,(L a/ Sm) N 和 (Gd/ Yb) N比值相对减少 ,即有机酸对风化壳稀土分异作用作出了贡献。     

添加稀土的新型矿用硬质合金研究

在Ｚ２５、Ｚ３０合金中加稀土元素，研制成ＺＲ２５、ＺＲ３０新型用合金，使其抗弯强度，冲击韧性提高１０％以上，使用寿命大为增加，并在进行对比试验的基础上，简要讨论和分析了稀土元素在矿用合金中的作用。     

Study on PVC Grafted with Acrylic Rare Earths

The copolymers were formed by the graft copolymerization of PVC with acrylic rare earth. The principle and method of the graft copolymerization of PVC and acrylic rare earth were discussed. The graft copolymers were characterized by FT-IR spectra and scanning electron microscope (SEM). The thermal stability of the graft-copolymers was studied by thermogravimetric analysis (TG). The experiment results show that the thermal resistance and toughness of the graft copolymers are obviously enhanced.