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     Study of 2-14- 1 Phase and Nd_2(Fe,Co)_(14) B in Nd -Fe-B Alloy
     Nd-Fe-B合金中2-14-1相和Nd_2(Fe,Co)_(14)B的研究
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     Structure and Curie Temperature of(Dy_(0. 65)Tb_(0.25)Pr_(0.1) )_2(Fe_(1-x)Al_x )_(17)
     (Dy_(0.65)Tb_(0.25)Pr_(0.1))_2(Fe_(1-x)A
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     Studys of the Effect of HDDR and HD on the Structure and Magnetic Properties of Sm_3(Fe,M)_(29)N_x/α-Fe(M=Co, Ti)
     HDDR及HD处理对Sm_3(Fe,M)_(29)N_x/α-Fe(M=Co,Ti)组织结构与磁学性能的影响
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     MAGNETOSTRICTIVE BEHAVIOUR OF R(Fe_(1-x)Al_x)_y ALLOYS(R = Dy_(0.65)Tb_(0.25)Pr_(0.1))
     MAGNETOSTRICTIVE BEHAVIOUR OF R(Fe_(1-x)Al_x)_y ALLOYS(R=Dy_(0.65)Tb_(0.25)Pr_(0.1))
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     Solid Soution α-(Fe_(1-x)Sb)_2O_3(0≤x≤0.2)as Gas Sensing Materials
     固溶体α-(Fe_(1-x)Sb_x)_2O_3(0≤x≤0.2)气敏材料
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     Fe?
     Fe?
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     The distribution of Fe-Mn oxide-bound metals is consistent with the clay particle.
     Fe-M(?)
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     Fe(Ⅲ)-o-PHENANTHROLINE SPECTROPHOTOMETRY OF ISONIAZID
     异烟肼的FeⅢ)-邻二氮菲分光光度测定
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Preparation of Fe3O4 magnetic fluid by one-step method with a microemulsion reactor
      
The Fe3O4 magnetic fluid was obtained by one-step method with the W/O microemulsion as microreactor to synthesize magnetic nanoparticles (reaction temperature was 30 °C and reaction time was 5 h) and kerosene as carrier liquid.
      
The average particle size of Fe3O4 was 7.4 nm, and magnetic particles were well-dispersed.
      
The stable Fe3O4 magnetic fluid with good magnetism may be produced by one-step method in the W/O microemulsion.
      
Preparation and magnetic properties of Fe0.3Co0.7 nanowire array
      
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Magnetization curves of the polycrystalline Fe-Co and Ni-Co alloys of the cubic system and also of the pure cobalt were determined by means of a ballistic method. Gans' theory of the magnetic properties of isotropic ferromagnetics was applied. The agreement between his theory and the experimental results is quite good for the strong fields but not so for the weak fields, just as in the ease of the pure ferromagnetics. The discrepancy for the weak fields may be explained by his neglect of the free energy...

Magnetization curves of the polycrystalline Fe-Co and Ni-Co alloys of the cubic system and also of the pure cobalt were determined by means of a ballistic method. Gans' theory of the magnetic properties of isotropic ferromagnetics was applied. The agreement between his theory and the experimental results is quite good for the strong fields but not so for the weak fields, just as in the ease of the pure ferromagnetics. The discrepancy for the weak fields may be explained by his neglect of the free energy which is required to magnetize the elementary crystals isothermally to the saturation intensities in the easy direction of magnetization. After including this part of the energy the agreement between theory and experiment is improved in general and in some cases, it is remarkably good. For pure cobalt the magnetization intensities for a given field are smaller than those obtained by previous investigators, but in better agreement with the theory than those previously obtained. Since the disagreement cannot be accounted for by the experimental error in the present investigation, the comparatively less studied cobalt needs further investigation.

用冲击法量属於正方晶系之铁钴及镍钴合金并纯钴之多结晶体之磁化曲线与Gans氏各向同性铁磁物质磁性之理论相较知在强磁场时理论与实验之契合甚佳在弱磁场时则较差,弱磁场时之差异,可以Gans氏计算时略去磁化各元晶体於其易磁化方向至饱和度所需之自由能一点解释之改正此点后理论与实验之契合大体改善在数种合金且极佳。纯钴之磁化强度在各磁场下较之前人所得者均小,惟与理论之契合则较佳:此与前人不同之点既不能归诸本实验之误差,则此较少被注意之钴实需要更进一步之研究

In view of the necessity of a rapid and accurate process for the deter-mination of fluorine applicable in the analysis of sodium fluoride and otherfluorine compounds,the author has established a new volumetric processconsisting in the titration in aqueous-alcoholic medium with ferric nitrate asstandard solution and sodium salicylate as indicator.All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the reaction:6NaF+FeCl_3→Na_3FeF_6+3NaCl....

In view of the necessity of a rapid and accurate process for the deter-mination of fluorine applicable in the analysis of sodium fluoride and otherfluorine compounds,the author has established a new volumetric processconsisting in the titration in aqueous-alcoholic medium with ferric nitrate asstandard solution and sodium salicylate as indicator.All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the reaction:6NaF+FeCl_3→Na_3FeF_6+3NaCl. But the sodium ferric fluoride thus formed is fairly soluble in water and makesthe end-point unclear,therefore the titration can not be performed accurately.This seems to be due to the fact that the following two reactions advancesimultaneously,and accordingly the formation of sodium ferric fluoride is in-complete in aque(?)us medium:3NaF+Fe(NO_3)_3→FeF_3+3N_aNO_33NaF+FeF_3→Na_3FeF_6Nevertheless,these reactions,according to the author's experiments;proceedalmost quantitatively in meda.containing at least 50% by volume of alcohol.This paper reports the xperimental results obtained in the fundamentalstudies on the various factors influencing the accuracy of the volumetry,namely,the sensitivity and the necessary amount of sodium salicylate used asindicator,the pH value,the alcoholic concentration of the titration medium,the concentration of the fluoride taken for the determination and the timewhen alcohol should be added in the course of titration.Furthermore,a rapidvolumetric process with high accuracy is proposed together with its applicationsin ordinary analyses of sodium fluoride and other fluorine compounds.The proposed method is characteristic in using sodium salicylate asindicator,which shows sharp violet color with minute amount of ferric ion inmedium of pH 3 controlled with buffer solution,then titrating with standardferric nitrate,and adding proper amount of alcohol(the alcoholic concentra-tion at the end-point should be above 50%)during the titration,when themedium becomes orange yellow in color.The method may be summarized as follows:Take 5 ml of neutral sodiumfluoride solution of about 0.3 N in a small Erlenmeyer flask,add 2.5 mlof Walpole's buffer solution of pH 3(formed by dissolving 34.0 g ofcrystalline sodium acetate and 20 ml of 38% HCl in water,and making upto 250 ml)and 1 ml of 0.1 M sodium salicylate dissolved in 50% alcohol.After sufficient stirring,titrate with standard 0.3 N(0.05 M)ferric nitratesolution,using micro-burette until the medium becomes orange yellow,thisstep being reached after addition of about 4 ml of titrant.Then decolorizethe solution by adding 12.5 ml of absolute alcohol(or 13 ml of 95% alcohol),previously purified by redistillation with lime;stirring is necessary during theaddition.Further continue the titration until the light pink color formeddoes not fade after stirring for 30 seconds when observed over a white surface. In the analyses of sodium fluoride and other fluorine compounds con-taining interfering substances,such as divalent and polyvalent metallic ions,phosphate,silicate,borate,carbonate,sulfide ions and reductants acting on ferricion,it is necessary to separate fluorine from these interfering substances bythe distillation with sulfuric acid according to the method of Willard andWinter(20).Then the distillate is neutralized with dilute sodium hydroxideand adjusted to the proper pH with hydrochloric acid using p-nitrophenol asindicator.The solution is ready for titration as described.But in the caseof absence of these interfering substances except carbonate,for example,inthe determination of the concentration of sodium fluorde solution obtained bythe extraction of the crude product,produced industrially by fusing fluorsparwith sodium carbonate and silica,the above separation of fluorine by dis-tillation is dispensable.The anaIytical results obtained by the proposed method are in goodagreement with those obtained by the lead chlorofluoride process(8),whichis recognized as official method for the determination of fluorine in agriculturalproducts.

本文介绍一容量分析氟的新方法和在工业制品上的应用,并分析了一种工业制备的氟化钠液,所得的结果和氟氯化铅法所得的极为一致。对于影响该分析法准确度的各种因素:指示剂的灵敏度和滴定时适宜的用量、溶液的 pH 值、应加的乙醇量、操作中加乙醇的次序、以及氟离子的适宜浓度,均加以研究并找出适宜的情况。本法用硝酸铁为标准液,水杨酸钠作指示剂,在 pH=3左右作滴定;当溶液呈橙黄色时,加入适量的乙醇,使其浓度在终点时仍不低于50%。如有干扰物质如二价及多价金属离子、磷酸根、矽酸根、硼酸根、碳酸根、硫化物和还原物质可能与三价铁起作用者,均应分离之。

A spectrographic procedure for determining copper in concentrated iron ores has been worked out for routine analysis. The powder method is found to be satisfactory with a medium quartz spectrograph and an activated a. c. arc between carbon electrodes as light source. In order to minimize erratic burning of the sample, the electrodes are pre-burned for one minute and then loaded with a mixture of equal weight of the ore sample and carbon powder. The analysis pair of lines chosen are: Cu 2824.369- Fe 2824.67...

A spectrographic procedure for determining copper in concentrated iron ores has been worked out for routine analysis. The powder method is found to be satisfactory with a medium quartz spectrograph and an activated a. c. arc between carbon electrodes as light source. In order to minimize erratic burning of the sample, the electrodes are pre-burned for one minute and then loaded with a mixture of equal weight of the ore sample and carbon powder. The analysis pair of lines chosen are: Cu 2824.369- Fe 2824.67 for copper contents ranging from 0.05 to 0.3%, and Cu 2824369- Fe 2828.813 for those between 0.3 and 1.0%. The results obtained spectrographically have been checked by wet chemical analysis, amongst 110 samples 80% of which the two methods checked within 0.02%.

我们尝试用光谱的方法协助解决分析大量铁矿精矿试样中微量铜(O.05-0.1%)的问题。采用了交流电弧碳电极粉末法,应用现有的设备(中型光谱仪、不纯碳电极、质量低的照相板)进行试验,找出了比较适当的激发条件和分析线对。把空白碳电极加以预燃并在铁矿试样中搀入适当分量的碳粉,可以基本上消减样品在燃烧中的喷爆现象。根据样品的燃烧曲线的研究,选择了适当的曝光时间,使分析的结果不受样品所含铜的化学组成状态的影响。 所选定的分析线对当含铜量在0.05-0.3%的范围内时是Cu2824.369-Fe2824.67,当含铜量在0.3-1.0%的范围内时是Cu2824.369-Fe2828.813。根据所得的两条定标曲线作了110个样品的分析,光谱分析结果与化学分析结果的差值在0.02%以下的约占分析样品总数的80%左右。关于含铜量为0.05-0.3%的样品,光谱分析已经可以代替化学分析,并节省大量的人力和物资。

 
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