NdF3—LiF—Nd2O3体系表面张力数学模型的研究

用拉筒法研究了低NdF3浓度下NdF3-LiF体系的表面张力,采用二因子二次回归正交设计,得出表面张力（σ）与NdF3含量（C）、温度（t) 的回归方程,讨论了NdF3含量、温度对表面张力的影响,并考察了加入Nd2O3对体系表面张力的影响。     

纳米晶Fe_3B/Nd_2Fe_(14)B粘结永磁体的磁性能研究

本文研究了粘结剂含量和温度－时间变化对纳米晶Ｆｅ３Ｂ／Ｎｄ２Ｆｅ１４Ｂ粘结永磁材料的磁性能影响。结果表明降低粘结剂含量可显著地提高纳米晶Ｆｅ３Ｂ／Ｎｄ２Ｆｅ１４Ｂ粘结永磁的磁性能；环境温度对纳米晶Ｆｅ３Ｂ／Ｎｄ２Ｆｅ１４Ｂ粘结永磁的磁性能具有重要影响，在较高的温度下其磁性能将显著下降，因此纳米晶Ｆｅ３Ｂ／Ｎｄ２Ｆｅ１４Ｂ粘结永磁只能在较低的温度环境下使用     

用以磷酸三丁酯为载体的乳状液膜提取钕（Ⅲ）的研究

用磷酸三丁酯－Ｓｐａｎ８０－二甲苯乳状液膜体系研究了Ｎｄ（Ⅲ）的迁移行为。当膜相组成为０．０４０ｍｏｌ／Ｌ磷酸三丁脂和３％（ｗ／ｖ）Ｓｐａｎ８０，内相为０．１５ｍｏｌ／ＬＮａ２Ｓ２Ｏ３，外相为２．５ｍｏｌ／ＬＨＮＯ３，Ｎｄ（Ⅲ）能快速并完全迁移。常见过渡元素离子Ｆｅ２＋、Ｃｏ２＋、Ｎｉ２＋、Ｍｎ２＋、Ｚｎ２＋、Ｃｄ２＋、Ｃｕ２＋等均不迁移，故可以从这些离子的混合液中分离Ｎｄ（Ⅲ），其回收率达９４％以上。     

熔盐电解制取富镧钕合金熔体初晶温度的研究

本文研究了添加富镧钕碳酸稀土（２％ＲＥ２Ｏ３）的ＲＥＦ３－ＬｉＦ－ＢａＦ２体系的初晶温度，求出了初晶温度的回归方程，绘出了初晶温度等值图，讨论了各因素对初晶温度的作用。实验结果可为以富镧钕稀土碳酸盐做原料，在氟盐体系中电解生产富镧钕合金的新工艺，提供基础数据。     

NdF3-LiF-Nd2O3体系表面张力的研究

用拉筒法研究了 Nd F3- L i F体系的表面张力。采用二因子二次回归正交设计 ,得出表面张力 (σ)与Nd F3含量 (C)、温度 (t)的回归方程 ,讨论了 Nd F3含量、温度对表面张力的影响 ,并考察了加入 Nd2 O3 对体系表面张力的影响     

单核NH_4［Nd（CH_3COO）_4（H_2O）］的制备和晶体结构

在４－甲基２－羟基喹啉存在条件下，ＮｄＣｌ＿３和ＣＨ＿３ＣＯＯＮＨ＿４在无水乙醇中反应制备了八配位单核ＮＨ＿４［Ｎｄ（ＣＨ＿３ＣＯＯ）＿４（Ｈ＿２Ｏ）］。其晶体为单斜晶系，Ｐ＿（２１／Ｃ）空间群，晶胞参数如下：ａ＝８．７７２（２），ｂ＝２０．２８５（５），ｃ＝８．１４９（３），β＝９０．２４（２）°，Ｖ＝１４４８．４（８）￣３，Ｚ＝４。     

NdF3-LiF-Nd2O3体系表面张力的研究

用拉筒法研究了NdF3-LiF体系的表面张力。采用二因子二次回归正交设计,得出表面张力(σ)与NdF3含量(C)、温度(t)的回归方程,讨论了NdF3含量、温度对表面张力的影响,并考察了加入Nd2O3对体系表面张力的影响。     

NdFeB废料回收Nd2O3工艺试验及实践

较系统地研究了ＮｄＦｅＢ废料回收Ｎｄ２Ｏ３的工艺试验,并进行了工业生产,产品纯度高（Ｎｄ２Ｏ３≥９９％,Ｄｙ２Ｏ３≥９９％）,非稀土杂质低（ＳｉＯ２、ＣａＯ、Ｆｅ２Ｏ３均≤００５％）。产品可作为生产金属钕的原料,满足ＮｄＦｅＢ生产的要求,该工艺流程短,操作简便,且回收率高（ＮｄＯ３实收率＞８２％）,工业生产投资少,见效快,环境污染小等优点     

NdF_3-LiF-Nd_2O_3体系表面张力数学模型的研究

用拉筒法研究了低NdF3 浓度下NdF3-LiF体系的表面张力 .采用二因子二次回归正交设计 ,得出表面张力 (σ)与NdF3 含量 (C)、温度 (t)的回归方程 ,讨论了NdF3含量、温度对表面张力的影响 ,并考察了加入Nd2 O3 对体系表面张力的影响     

水热法合成BaNd_xFe_（12－x）O_（19）铁氧体的研究

本文利用水热法合成了六角形磁铅石结构的ＢａＮｄｘＦｅ（１２－ｘ）Ｏ（１９）铁氧体，用Ｘ射线衍射仪、透射电子显微镜和振动样品磁强计等仪器对粉末的结构、形貌和磁学性能进行了研究，并讨论了Ｎｄ（３＋）对钡铁氧体磁学性能的影响。结果表明，Ｎｄ（３＋）可以明显提高ＢａＦｅ（１２）Ｏ（１９）粉末的矫顽力。     

NdF3-LiF-Nd2O3体系粘度的研究

采用坩埚扭摆法研究了 Nd F3- L i F熔盐体系的粘度 ,讨论了 Nd F3含量及温度对体系粘度的影响 ,并考察了加入 Nd2 O3对体系粘度的影响。合理地解释了个别组分熔盐粘度出现异常的现象     

Density and ionic structure of NdF3-LiF melts

NdF3-LiF melts are commonly used in the electrolysis process of metallic neodymium production. Research on the density and ionic structure of the electrolyte is important for its close connection with the electrolysis mechanism and process. In this paper, the density of LiF-NdF3 melts was studied by the Archimedes method. The results showed that the density decreased with increasing temperature and LiF contents. The changing law was discussed and explained in terms of the micro ionic structure of the melts....     

钕电解相关物质理论分解电压的计算

本文计算了NdF3-LiF-Nd2O3体系各物质的理论分解电压。结果表明,采用惰性阳极,理论分解电压按Nd2O3、NdF3、LiF顺序依次增大,温度升高,理论分解电压降低;采用活性阳极(石墨)时,Nd2O3与石墨反应生成CO和CO2,其理论分解电压较小,反应较易发生,尤以生成CO的反应更易发生。但当电流密度较高或Nd2O3浓度较低时,可能生成碳氧氟化合物及氟碳化合物,并发生阳极效应,各物质的理论分解电压也随温度的升高而降低。     

钕电解阳极过电位的测定

用慢扫描示波法测定了钕电解的阳极过电位 .考察了温度、阳极电流密度、Nd2 O3添加量、电解质组成等因素对阳极过电位的影响 ,探讨了降低阳极过电位的可能途径 .结果表明 ,阳极过电位随阳极电流密度的增加而增大 ,随温度的升高而减小 ,一定范围内 ,阳极过电位与阳极电流密度的对数呈线性关系 ,满足塔菲尔方程 ;电解质中LiF和Nd2 O3浓度增加 ,阳极过电位降低 ;适当控制阳极电流密度、升高温度、增加电解质中LiF和Nd2 O3的浓度并尽可能减小极间距 ,均有利于降低阳极过电位     

NdF3—NaF—LiF熔体电导率的研究

采用三因子一次正交回归设计实验，研究了NdF3-NaF－LiF熔体的电导率，得出了该体系电导率的数学模型，分析了温度、NdF3浓度、NaF与LiF的摩尔比对电导率的影响。结果表明，提高温度、降低NdF3浓度、降低NaF与LiF的摩尔比均能提高电导率。所得研究结果可为稀土氟盐电解选择廉价电解质成分提供依据。     

Measurement of Densities and Surface Tensions of NaCl-KCl-ScCl_3 System

Scandiumpossessesexcellentphysicochemi-calproperties.WhenalittleofScisaddedintoAlalloy,thestrengthandhardnessofAlalloycanbeincreasedremarkably,andthesyntheticmechanicalpropertiescanbeimprovedlarge-ly['~sJ-Especially,Al-ScalloyhasexcellentsuI:rplasticalproperty,andtheelongationofAlalloywith~0.5%Sccanreachupt01lO0q'bymeans0fsuperplasticforming['j.Inaddition,becausethereisonlyalittledifferenceindensityofAlandSc,Al-Scalloywithhighspecialstrength(theratioofthestrengthtotheweight)canbeprepared…     

Electrochemical study on preparation of Mg-Li-Yb alloys in LiCl-KCl-KF-MgCl2-Yb2O3 melts

This paper presented a novel study on electrochemical codeposition of Mg-Li-Yb alloys in LiCl-KCl-KF-MgCl2-Yb2O3 melts on molybdenum. The factors of the current efficiency were investigated. Electrolysis temperature had great influence on current efficiency; the highest current efficiency was obtained when electrolysis temperature was about 660 oC. The content of Li in Mg-Li-Yb alloys increased with the high current densities. The optimal electrolytic temperature and cathodic current density were around 660 oC and 9.3 A/cm2, respectively. The chemical content, phases, morphology of the alloys and the distribution of the elements were analyzed by X-ray diffraction, scanning electron microscopy, inductively coupled plasma mass spectrometry, respectively. The intermetallic of Mg-Yb was mainly distributed in the grain boundary of the alloys, presented as reticulated structures, and refined the grains. The lithium and ytterbium contents in Mg-Li-Yb al-loys could be controlled by changing the concentration of MgCl2 and Yb2O3 and the electrolysis conditions.     

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

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Identification of ions present in LiF-DyF3 melts and the mechanism of Dy2O3 dissolution therein

Herein, the present paper were attempted to identify ions in LiF-DyF_3 melts according to the law of decreasing primary crystallization temperature and model analysis. Specifically.the primary crystallization temperatures of LiF-DyF_3 and LiF-DyF_3-Dy_2O_3 melts with various DyF_3 and Dy_2O_3 contents were determined by differential scanning calorimetry(DSC), and reactions occurring in the above melts were investigated using ideal dilute solution(Temkin and Flood) models. Moreover, crystal phases produced by rapid solidification of LiF-DyF_3, LiF-Dy_2O_3, DyF_3-Dy_2O_3, and LiF-DyF_3-Dy_2O_3 melts were identified by X-ray diffraction(XRD) analysis. The primary crystallization temperature of LiF-DyF_3 melts exhibits an approximately linear decrease with increasing molar fraction of DyF_3, and the general formula of complex ions in these melts is expressed as DyF_x~((3-x)),e.g., DyF_4~-. Finally, we investigated the dissolution of Dy_2O_3 in LiF-DyF_3 melts, showing that it was chemical in nature and afforded Dy_(1+x)O_(3x)F_(3-3x) and DyOF.