钇对Fe-Cr-Al合金氧化膜粘附性的影响

利用热重分析,扫描电镜及能谱分析等手段研究了合金中弥散分布的Ｙ,Ｙ２Ｏ３及离子注入Ｙ＾＋对Ｆｅ－２３Ｃｒ－５Ａｌ合金１１００℃恒温氧化行为的影响。不含Ｙ的Ｆｅ２３Ｃｒ５Ａｌ合金氧化膜起皱,长时间氧化后冷却过程中膜发生开裂剥落。合金离子注入１＊１０＾１７Ｙ＾＋／ｃｍ＾２后氧化膜粘附性得到了改善。合金中加入弥散的Ｙ或Ｙ２Ｏ３改变了氧化膜形貌,膜平坦致密,不开裂剥落,不含Ｙ的Ｆｅ２３Ｃｒ５Ａｌ合金氧化膜皱褶形貌的形成及膜发生剥落的原因与氧化膜生长机制及合金中Ｓ的界面偏聚有关,Ｙ提高Ｆｅ－Ｃｒ－Ａｌ合金氧化膜粘附性的原因主要在Ｙ易与Ｓ形成稳定的硫化物,从而阻止了Ｓ在膜／合金界面偏聚。Ｙ提高Ａｌ２Ｏ３膜粘附性的原因还在于改变了Ａｌ２Ｏ３膜的生长机制。     

急冷Al－Fe－V－Si－Mm合金的穆斯堡尔谱研究

利用穆斯堡尔谱和Ｘ射线衍射研究了４种Ａｌ－Ｆｅ－Ｖ－Ｓｉ－Ｍｍ合金的Ｆｅ原子组态。结果表明，添加混合稀土元素后抑制了基体合金Ａｌ－Ｆｅ－Ｖ－Ｓｉ中α－Ａｌ１３（Ｆｅ，Ｖ）３Ｓｉ弥散粒子相的析出；当稀土含量高达６ａｔ％时，形成Ａｌ－Ｆｅ－Ｖ－Ｓｉ－Ｍｍ非晶态，采用Ｖｏｉｇｔ基函数作了穆斯堡尔谱的合理拟合和分析。     

磷酸三丁酯色层分离—电感耦合等离子体原子发射光谱法测定U3Si2

本法对Ｕ３Ｓｉ中２２个微量杂质元素的测定，进行了较系统的实验研究，取样１００ｍｇ时，Ａｌ、Ｃａ、Ｃｄ、Ｃｒ、Ｃｕ、Ｆｅ、Ｈｆ、Ｉｎ、Ｍｇ、Ｍｎ、Ｍｏ、Ｎｂ、Ｎｉ、Ｐｂ、Ｓｎ、Ｔａ、Ｔｉ、Ｖ、Ｙ、Ｚｎ和Ｚｒ的测定范围５μｇ／ｇ－８００μｇ／ｇ，回收率为９４％－１０５％，ＲＳＤ（ｎ＝８）０．４％－１．２％。     

Sm2(Fe,Al,Zr)17C1.5合金微结构与磁性能的关系

用Ｘ射线衍射仪,振动样品磁强计,扫描电镜及透射电镜对Ｓｍ２Ｆｅ１５．３Ｚｒ０．２Ａｌ１．５Ｃ１．５合金的微结构和磁性进行了研究。合金主要由２／１７相、α－Ｆｅ相和ＺｒＣ要组成。     

急冷Al—Fe—V—Si—Mu合金的穆斯堡尔谱研究

利用穆斯堡尔谱和Ｘ射线和衍射研究了４种Ａｌ－Ｆｅ－Ｖ－Ｓｉ－Ｍｕ合金的Ｆｅ的原子组态。结果表明，添加混合稀土元素后抑制了基体合金Ａｌ－Ｆｅ－Ｖ－Ｓｉ中α－Ａｌ１３（Ｆｅ，Ｖ）３Ｓｉ弥散粒子相的析出；当稀土含量６ａｔ％时，形成了Ａｌ－Ｆｅ－Ｖ－Ｓｉ－Ｍｕ非晶态，采用Ｖｏｉｇｔ基函数作了穆斯堡尔谱的合理拟合和分析。     

钇对Fe-Cr-Al合金循环氧化行为的影响

用热重分析、扫描电镜及能谱分析等手段研究了合金中弥散分布的Ｙ、弥散分布的Ｙ２Ｏ３及离子注入Ｙ＾＋对Ｆｅ－２３Ｃｒ－５Ａｌ合金１１００℃循环氧化行为的影响,不含Ｙ的合金比１００ｈ循环氧化后氧化膜发生了开裂和剥落,露出合金基体;加入弥散的Ｙ或Ｙ２Ｏ３的合金经１００ｈ循环化后氧化膜平坦致密,不剥落,离子注入１＊１０＾１７Ｙ＾＋／ｃｍ＾２后合金氧化膜主要发生层间剥落。Ｙ提高Ｆｅ－Ｃｒ－Ａｌ合金氧化膜粘附性     

Fe－P－O系催化剂上的甲烷氧化偶联

研究了Ｆｅ－Ｐ－Ｏ催化剂对甲烷氧化偶联（ＯＣＭ）的低温催化活性，考察了催化剂组分的优化，最适宜的反应温区，反应过程参数，助催化剂组分，催化剂的晶型结构和活性相以及Ｆ：元素键合状态的ＸＰＳ谱．确定了８％ＬｉＮＯ３－０．８Ｆｅ／Ｐ催化剂在６５０℃，ＣＨ４：Ｏ２：Ａｒ＝２：１：２及ＧＨＳＶ＝３０００ｈ－１条件下，可获得甲烷转化率为１１．９０％和Ｃ２烃选择性为６９．８１％的结果．添加ＬｉＮＯ３为助催成分，可有效改善催化剂表面酸活性中心的分布，防止ＯＣＭ中深度氧化和表面积炭，提高Ｃ２和Ｃ２烃选择性．该催化剂为可变价型，是六方形和料方形两种晶型结构的复合磷酸铁，活性相为斜方形ＦｅＰＯ４物相．     

LiAgSO4-Al2O3复合电解质的导电性研究

研究了分散第二相α－Ａｌ２Ｏ３对ＬｉＡｇＳＯ４的离子导电性的影响，发现ＬｉＡｇＳＯ４－Ａｌ２Ｏ３的电导率随ａ－Ａｌ２Ｏ３含量的增加而升高，在３００－５００℃间电导率高于纯ＬｉＡｇＳＯ４，ａ－Ａｌ２Ｏ３含量摩尔比约为４０时最高。ＴＧ－ＤＴＡ和ＸＲＤ分析表明，在高温稳定的体立心ＬｉＡｇＳＯ４降温后以Ａｇ２ＳＯ４的正交β相形式存在，但在Ｈ２Ｏ存在下，生成Ｌｉ２ＳＯ４．Ｈ２Ｏ和Ａｇ２ＳＯ４．ＦＴ－ＩＲ分析     

（四甲基二硅撑）双（3－三甲硅基环戊二烯基）－四羰基二铁的反应性

标题化合物（Ｍｅ_２ＳｉＳｉＭｅ_２）［η￣５－（３－Ｍｅ_３ＳｉＣ_５Ｈ_３）Ｆｅ（ＣＯ）_２］_２／（μ－ＣＯ）_２（Ａ）分子中的Ｆｅ－Ｆｅ键被钠汞齐还原断裂，生成相应的双铁负离子，分别与ＭｅＣＯＣｌ、ＰｈＣＯＣｌ、ＰｈＣＨ_２Ｃｌ、ＣｌＣＨ_２ＣＯＯＣ_２Ｈ_５和Ｐｈ_３ＳｎＣｌ进行亲核取代反应，生成在铁原子上引入相应取代基的产物（Ｍｅ_２ＳｉＳｉＭｅ_２）［η￣５－（３－Ｍｅ_３ＳｉＣ_５Ｈ_３）Ｆｅ（ＣＯ）_２Ｒ］_２（Ｒ：ＭｅＣＯ（１），ＰｈＣＯ（２），ＰｈＣＨ_２（３），ＣＨ_２ＣＯＯＣ_２Ｈ_５（４），Ｐｈ_３Ｓｎ（５），Ｉ（６））。Ａ在氯仿中与碘反应，得到Ｆｅ－Ｆｅ断裂的双铁碘化物，但在苯中与过量碘反应，则得到Ｆｅ－Ｉ－Ｆｅ桥联的离子型化合物（Ｍｅ_２ＳｉＳｉＭｅ_２）［η￣５－（３－Ｍｅ_３ＳｉＣ_５Ｈ_３）Ｆｅ（ＣＯ）_２］_２Ｉ·Ｉ（７）。化合物６的晶体和分子结构经Ｘ射线衍射测定，６属单斜晶系，Ｐ２１／ｃ空间群，ａ＝１．７２１７（４）ｎｍ，ｂ＝０．７７５３（２）ｎｍ，Ｃ＝１．３６２９（７）ｎｍ，β＝１０３．８０（３）°，Ｖ＝１．７６７（２）ｎｍ３，Ｚ＝４，Ｄｃ＝１．６２９９·ｃｍ－１，最终偏差因子Ｒ＝０．０５４。     

环状配合物Me_2Si［η~5－C_5H_4Fe（CO）_2］_2SnR_2的合

通过ＳｎＣｌ_２对化合物Ｍｅ_２Ｓｉ［η~５－Ｃ_５Ｈ_４Ｆｅ（ＣＯ）］_２（μ－ＣＯ）_２（Ⅰ）中Ｆｅ－Ｆｅ键的插入反应以及Ⅰ被Ｎａ－Ｈｇ齐还原所生成的相应双铁负离子｛Ｍｅ_２Ｓｉ［η~５－Ｃ_５Ｈ_４Ｆｅ（ＣＯ）_２］_２｝~（２－）与ＳｎＲ_２Ｃｌ_２（Ｒ＝Ｍｅ，Ｐｈ）的亲核反应，合成了环状化合物Ｍｅ_２Ｓｉ［η~５－Ｃ_５Ｈ_４Ｆｅ（ＣＯ）_２］_２ＳｎＲ_２［Ｒ＝Ｃｌ（１），Ｍｅ（２），Ｐｈ（３）］。以元素分析、ＩＲ和~１ＨＮＭＲ谱表征了它们的结构，并用Ｘ射线衍射测定了配合物３的晶体结构。３为单斜晶系，空间群Ｐ２_１／ｎ，ａ＝１．０３８４（３）ｎｍ，ｂ＝１．６３８４（１）ｎｍ，ｃ＝１．５７６２（５）ｎｍ，β＝９７．９３（２）°，Ｖ＝２．６５６（２）ｎｍ~３，Ｚ＝４，Ｄｘ＝１．７１ｇ／ｍＬ。     

离子注入Y对Fe3Al高温氧化行为的影响

通过金属蒸汽真空弧离子源（简称ＭＥＶＶＡ）方法在Ｆｅ３Ａｌ表面离子注入Ｙ。在１０００℃空气中的氧化实验表明，Ｆｅ３Ａｌ经离子注入Ｙ后，初期氧化速率略有升高，但稳态氧化速率大大降低，氧化膜的塑性和粘附性大大提高，抗氧化性能明显改善。其原因在于注入的Ｙ＋在氧化过程中优先氧化，阻碍金属离子向外扩散，促进氧向内传输，改变了氧化膜的形成和生长机制。     

电沉积-热解Y2O3薄膜提高Fe3Al高温氧化膜的保护性

通过电沉积热解方法在Ｆｅ３Ａｌ表面制得Ｙ２Ｏ３薄膜。对有、无薄膜Ｆｅ３Ａｌ试样在９００℃空气中非等周期循环氧化，发现表面施加Ｙ２Ｏ３薄膜能够显著改善氧化膜的塑性和粘附性，提高Ｆｅ３Ａｌ的抗高温氧化性能。     

Fe/RE多层膜磁性及其变化机制

研究了Ｆｅ／ＲＥ多层膜（Ｆｅ单层厚度〈２．０ｎｍ）沉积态退火过程中（温度≥４７３Ｋ）的结构与磁性，分析了磁性变化的原因。沉积态的Ｆｅ单层由分离的Ｆｅ岛组成，小尺寸的Ｆｅ岛呈超顺磁性导致了整个膜显示顺磁性，退火时Ｆｅ岛合并长大，膜由超顺磁转变为铁磁，同时磁化强度和妖顽力增加。     

Gelatin-Derived 1D Carbon Nanofiber Architecture with Simultaneous Decoration of Single Fe−Nx Sites and Fe/Fe3C Nanoparticles for Efficient Oxygen Reduction

Exploring high-performance non-precious-metal electrocatalysts for the oxygen reduction reaction (ORR) is critical. Herein, a scalable and cost-effective strategy is reported for the construction of one-dimensional carbon nanofiber architectures with simultaneous decoration of single Fe−N_x sites and highly dispersed Fe/Fe₃C nanoparticles for efficient ORR, through the Fe^III-complex-assisted electrospinning of gelatin nanofibers with subsequent pre-oxidation and carbonization. Results show that the presence of a Fe^III complex enables the 1D gelatin nanofibers to be well retained during the pre-oxidation process. Owing to the distinct 1D nanofiber structure and the synergistic effect of Fe/Fe₃C and Fe−N_x sites, the resulting electrocatalyst is highly active for ORR with a half-wave potential of 0.885 V (outperforming commercial Pt/C) and a superior electrochemical stability in alkaline electrolytes. Similarly, it also shows a high power density (144.7 mW cm⁻²) and a superior stability in Zn-air batteries. This work opens a path for the design and synthesis of 1D carbon electrocatalyst for efficient ORR catalysis.     

动物铁中毒

综述了动物铁中毒病，包括引起动物铁中毒的原因、毒理、临床症状、病理变化、诊断和防治等。尽管动物铁中毒在临床中较少发生，但其造成的动物中毒、环境污染和经济损失不容忽视。     

Time‐Resolved High and Low Temperature Phase Transitions of the Nanocrystalline Cubic Phase in the Y2O3‐ZrO2 and Fe2O3‐ZrO2 System

The nanocrystalline cubic Phase of zirconia was found to be thermally stabilized by the addition of 2.56 to 17.65 mol % Y₂O₃ (5.0 to 30.0 mol % Y, 95.0 to 70.0 mol % Zr cation content). The cubic phase of yttria stabilized zirconia was prepared by thermal decomposition of the hydroxides at 400°C for 1 hr. 2.56 mol % Y₂O₃‐ZrO₂ was stable up to 800°C in an argon atmosphere. The samples with 4.17 to 17.65 mol % Y₂O₃ were stable to 1200°C and higher. All samples at temperatures between 1450°C to 1700°C were cubic except the sample with 2.56 mol % Y₂O₃ which was tetragonal. The crystallite sizes observed for the cubic phase ranged from 50 to 150 Å at temperatures below 900°C and varied from 600 to 800 nm between 1450°C and 1700°C. Control of furnace atmosphere is the main factor for obtaining the cubic phase of Y‐SZ at higher temperature. Nanocrystalline cubic Fe‐SZ (Iron Stabilized Zirconia) with crystallite sizes from 70 to 137 Å was also prepared at 400°C. It transformed isothermally at temperatures above 800°C to the tetragonal Fe‐SZ and ultimately to the monoclinic phase at 900°C. The addition of up to 30 mol % Fe(III) thermally stabilized the cubic phase above 800°C in argon. Higher mol % resulted in a separation of Fe₂O₃. The nanocrystalline cubic Fe‐SZ containing a minimum 20 mol % Fe (III) was found to have the greatest thermal stability. The particle size was a primary factor in determining cubic or tetragonal formation. The oxidation state of Fe in zirconia remained Fe³⁺. Fe‐SZ lattice parameters and rate of particle growth were observed to decrease with higher iron content. The thermal stability of Fe‐SZ is comparable with that of Ca‐SZ, Mg‐SZ and Mn‐SZ prepared by this method.     

生血宁片中Fe元素的形态分析方法研究

为对生血宁片中Fe元素的形态进行分析,采用了溶剂法、树脂法制备相应供试品溶液,通过微波消解与ICP-MS法测定了生血宁片中Fe元素的含量,并进行了形态研究。结果表明,生血宁片中Fe元素主要以稳定态形式存在,既以有机态又以无机态形式存在,且主要以Fe2+的稳定结合态的形式存在。通过离子树脂筛选出不同价态的铁元素,为价态的分离提供一新方法,且进一步证明了Fe元素的起效形式,同时为中药材或中成药的质量控制及药理研究提供理论参考。     

碱金属离子对Fe(phen)3/Y催化氧化性能的影响

采用自由配体法,将铁邻菲啰啉(Fe(phen)3)配合物封装在含有不同碱金属阳离子的Y型分子筛中,制备了系列Fe(phen)3/M-Y(M=Li+,Na+,K+和Cs+)催化剂.采用X射线衍射、红外光谱、紫外-可见光谱、热重-差热分析、电感耦合等离子原子发射光谱、N2吸附-脱附以及催化氧化反应考察了碱金属离子对Fe(phen)3/M-Y催化剂物化性质和催化氧化性能的影响.结果表明,交换有不同碱金属离子的Y型沸石中Fe(phen)3的封装量不同,而且Fe(phen)3在Y型沸石中的热稳定性随着碱金属离子半径的增加有所降低,其中Fe(phen)3/Li+-Y具有最高的配合物封装量和热稳定性能.在环己烷或苯乙烯氧化反应中,在较低的反应温度下,Fe(phen)3/K+-Y表现出最高的催化活性,而在较高的反应温度下,Fe(phen)3/Cs+-Y的催化活性最高,碱金属离子对Fe(phen)3/M-Y催化氧化性能的影响是电子效应、空间限制作用和扩散效应的综合结果.     

Fe(III)-pyruvate and Fe(III)-citrate induced photodegradation of glyphosate in aqueous solutions

The photolysis of Fe(III)-pyruvate and Fe(III)-citrate complexes in water produces hydroxyl radicals in the presence of dissolved oxygen, and can promote the oxidation of organic compounds. The photodegradation of glyphosate with Fe(III)-pyruvate and Fe(III)-citrate complexes was investigated under irradiation at λ?≥?365?nm. The effect of initial concentration of glyphosate, the initial pH value, and the Fe(III)/carboxylate ratio were examined. Upon irradiation of glyphosate aqueous solution with the complexes in the acidic range of natural waters, the bioavailable orthophosphate could be released from degradation of glyphosate. The amount of orthophosphate increased with increasing Fe(III)/carboxylate ratio.     

Determination of Fe2+ and Fe3+ in Aqueous Solutions Containing Food Chelators by Differential Pulse Anodic Stripping Voltammetry

The objective was to investigate interactions between iron and food chelators in an aqueous environment. The net complexation were investigated by DPASV in a NaClO₄ electrolyte using a platinum electrode. The experimental conditions were simulating the environment of the human duodenum. The results indicated a net coordination affinity between Fe²⁺ and the organic acids in the following order; ascorbic acid≈phytate>pyruvate>lactate>acetate. For Fe³⁺ net complexation, the stability was in the order of lactate>phytate>pyruvate>acetate>citrate. In conclusion, DPASV in conjunction with a platinum electrode is suitable for studies in aqueous systems where the net complexation of metal is important.