Electrochemical performance of compounds Ho_6Fe_(23–x)Co_x (x=0,1,3)

Alloys with composition of Ho6Fe23–xCox (x=0,1,3) were prepared and examined by X-ray diffraction technique and automatic battery testing instrument.The compounds Ho6Fe23–xCox (x=0,1,3) crystallized in cubic Th6Mn23-type structure with space group Fm 3m (No.225).The electrochemical properties of these alloys such as discharge capacity,cycling performance and high rate dischargeability were investigated by battery testing instruments in alkaline electrolyte.Substitution of small amounts of Co for Fe in Ho6Fe...     

化合物LaAlSi的X射线粉末衍射数据

利用X-射线粉末衍射技术和Rietveld结构修正方法对LaAlSi的粉末衍射数据进行了研究，井得到了其X-射线粉末衍射数据。化合物LaAlSi具有α-ThSi2结构类型，空间群为I4 1／amd（No．141），Z=4。点阵参数为a=0．42245（1）nm，c=1．45204（2）nm，衍射峰指标化的可靠性因子F30=211.4（35）。用Rietveld结构修正方法对该化合物晶体结构进行了精化修正，拟合结果为Rp=0．099和Rwp=0．133。     

ITO粉的Rietveld全谱图拟合定量相分析

对ITO粉样品用Rietveld全谱图拟合法进行了定量相分析，该样品由立方晶型的In2O3和少量的四方晶系的SnO2所组成。In2O3和SnO2质量百分含量分别为94．23％和5．77％。结果表明，用Rietveld法进行了定量相分析是非常有效和准确的。     

Electrochemical performance of alloys Ho5Fe3CO12 and Ho33.3Co66.7

Alloys with composition Ho5Fe3Co12 and Ho33.3Co66.7 were prepared and examined by X-ray diffractometer and automatic battery testing instrument. The electrochemical properties of these alloys such as discharge capacity, cycling performance and high rate dischargeability were investigated by battery testing instruments in alkaline electrolyte. A comparison of the electrochemical performance of the Ho5Fe3Co12 and Ho33.3Co66.7 alloys revealed that alloy Ho5Fe3Co12 possessed a better electrochemical performance...     

磁化焙烧-磁选含铁氟碳铈粗精矿研究

某氟碳铈型稀土粗精矿中铁含量较高（全铁3%~10%）、稀土氧化物（REO）含量偏低,约占50%~60%,水分为6.5%;经工艺矿物学分析表明,粗精矿中铁元素主要以弱磁性的赤（褐）铁矿的形式存在,且部分铁矿物与氟碳铈矿解离不彻底,难以直接采用磁选方法与氟碳铈矿分离,因此采用磁化焙烧-磁选工艺提高REO品位。磁化焙烧热力学分析表明,在磁化焙烧过程中,氟碳铈矿发生分解反应,不会与铁氧化物发生反应;当温度高于626.85 ℃时,水会与碳发生水煤气反应产生CO和H2,即水分的存在有利于铁氧化物的还原。含水的稀土粗精矿在还原温度为650 ℃、还原时间为30 min和还原剂用量为2%的条件下,磁化焙烧的还原度为41.59%;经过一次粗选、再磨再选的工艺,精矿REO品位和回收率分别为68.53%、96.59%,铁粉的铁品位和回收率分别为68.56%、80.38%。该工艺的应用既提高了精矿REO和铁精矿品位,又省去了干燥作业。     

龙胜滑石矿晶体结构的Rietveld精修

用Rietveld全谱图拟合法精修产自广西桂林龙胜的优质滑石矿的晶体结构,属单斜晶系,空间群为C2/c,点阵常数a=0.5307(19)nm,b=0.9097(15)nm,c=1.8896(1)nm,β=99.1367°(4),z=4。     

Ag-Cu-P系富Cu合金相图500℃等温截面

用X射线衍射法、μDTA法和金相显微镜法测定了Ag-Cu-P(P<23wt-％)三元系富Cu合金相图500℃等温截面以及这三元系的含2wt—％Ag和含6wt-％P的垂直截面。在500℃等温截面中存在三个单相区、三个两相区和一个三相区。Ag,P在Cu中的最大固溶度分别为1.5wt-％和1.2wt-％,Cu在Ag中的最大固溶度为1.8wt-％。存在一个三元共晶反应,三相共晶点成分(wt-％)约为18Ag-74.5Cu-7.5P。     

X-ray Powder Diffraction Data and Rietveld Refinement for NdCoGe_3

ＸｒａｙＰｏｗｄｅｒＤｉｆｒａｃｔｉｏｎＤａｔａａｎｄＲｉｅｔｖｅｌｄＲｅｆｉｎｅｍｅｎｔｆｏｒＮｄＣｏＧｅ３ＹａｎＪｉａｌｉｎ，ＱｉｎＷｅｎ，ＯｕＸｉａｎｇｌｉａｎｄＺｅｎｇＬｉｎｇｍｉｎ（严嘉琳）（覃文）（区向丽）（曾令民）Ｉｎｓｔｉｔｕｔｅｏ...     

Electrochemical performance of Gd-Co-Mn alloys

The Gd-Co-Mn alloys with compositions of Gd33.3Co66.7,Gd33.3Mn66.7,Gd22.2Co74.8Mn3 and Gd25Co70Mn5 were prepared and examined by X-ray diffractometer.The electrochemical properties of these alloys such as discharge capacity,cycling performance and high rate dischargeability were investigated by battery testing instruments in alkaline electrolyte.The discharge capacity of Gd22.2Co74.8Mn3 was the highest among these alloys at the same discharge current density,and the maximum value was 376.7 mAh/g discharged at 150 mA/g.The discharge capacities of the alloys Gd33.3Co66.7 and Gd33.3Mn66.7 reached their maxima(about 225 and 325 mAh/g)at discharge current density of 150 mA/g.A comparison of the electrochemical performance of the Gd-Co-Mn alloys revealed that the alloy Gd22.2Co74.8Mn3 possessed better electrochemical performance and had better discharge capacity,cycle stability,while the alloy Gd25Co70Mn5 had a better high rate discharge ability.In general,the electrochemical performance of ternary alloys was better than binary alloys in this case.