EFFECTS OF CONCENTRATION AND AVERAGE VALENCE OF TITANIUM SUBCHLORIDES ON THE ELECTRO-CRYSTALLIZATION OF TITANIUM

<正> 电解TiCl_4制取海绵钛和粗钛电解精炼的过程中,低价钛浓度和价比,以及温度、电流密度、杂质等,对钛的电结晶有直接的影响。Ануфриева,Alpert,TadanTomonari等人分别对低价钛浓度和价比的影响进行过研究。本文拟进一步探讨它们对钛的电结晶大小影响的原因,并结合电解TiCl_4的实际,加以分析讨论。     

Study on Electrodeposition of Gadolinium in (p-CH3C6H4SO3)3Gd-DMF Solution

1 ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｒａｒｅｅａｒｔｈ ｃｏｂａｌｔａｌｌｏｙｓｈａｖｅｔｈｅｐｏｔｅｎｔｉａｌｆｏｒｍａｋｉｎｇｔｈｅｍａｇｎｅｔｉｃａｎｄｍａｇ ｎｅｔｏ ｏｐｔｉｃａｌｍａｔｅｒｉａｌｓ .Ｓｏｆａｒ ,ｔｈｅｒａｒｅｅａｒｔｈ ｃｏｂａｌｔａｌｌｏｙｆｉｌｍｓａｒｅｓｕｂｓｔａｎｔｉａｌｌｙｐｒｏｄｕｃｅｄｂｙｓｐｕｔｔｅｒｉｎｇｏｒｖａｃｕｕｍｐｌａｔｉｎｇ .Ｉｆｓｕｃｈｆｉｌｍｓａｒｅｐｒｅｐａｒｅｄｂｙｅｌｅｃｔｒｏｄｅｐｏｓｉ ｔｉｏｎｉｎｓｔｅａｄ ,ｐｒｏｄｕｃｔｉｏｎｅｆ…     

Electroreduction of Y(Ⅲ)in Molten Chlorides and Alloying

The electroreduction of Y(Ⅲ)on tungsten electrode in NaCl-KCl-YCl_3 melt has been investi-gated by cyclic voltammetry.Deposition of Y(Ⅲ)to Y(0)is reversible in one step.The cyclic voltammetry,convolution voltammetry,potential-time curve after potentiostatic electrolysis and X-ray diffraction analy-sis were used to study the electrode process of Y(Ⅲ)reduced on iron electrode.Several Y-Fe intermetalliccompounds are formed before the deposition of metallic yttrium.The diffusion coefficient anddiffusion activation energy of Y in Y_6Fe_(23) were determined by current-time curve at potential step.The results indicate the diffusion of Y in its alloy phase is so slow that this step will control the electrode pro-cess.     

关于MnO_2的研究——Ⅲ H_2O_2在MnO_2的不同结晶变体上催化分解的动力学与机理(下)

对于在含有变价金属离子的氧化物催化剂上H_2O_2的变相分解,人们曾提出了各钟不同的机理。但是大多数都是以Haber和Weiss的开拓性工作为基础的,这两位学者前先引用自由基的链机构。其后不同作者对自由基作为中间体参与H_2O_2的催化分解提出了实验证据。     

A NEW Ni/Ni(Ⅱ) REFERENCE ELECTRODEAND ITS APPLICATION IN FLUORIDE MELTS

用Al_2O_3隔膜制成Ni/Ni~(2+)参比电极,其性能稳定,重现性和电化学可逆性良好。在860—960℃的氟化物熔盐中的使用寿命约为20h。利用此参比电极研究了氟化物熔盐中钇离子的电化学还原机理,得出钇离子在铂电极上的还原是一步完成的不可逆过程。     

Electrochemical Behaviors of Fe~(2 ) and Sm~(3 )in Urea-NaBr Low Temperature Melt and Their Inductive Codeposition

ＴｂＦｅ2 ｉｓｔｈｅｍａｘｉｍｕｍｍａｇｎｅｔｏｓｔｒｉｃｔｉｖｅｍａｔｅｒｉａｌａｔｔｈｅｐｒｅｓｅｎｔｔｉｍｅ .ＡｌｔｈｏｕｇｈｔｈｅλｏｆＳｍＦｅ2 ｉｓｓｌｉｇｈｔｌｙｌｏｗｅｒｔｈａｎｔｈａｔｏｆＴｂＦｅ2 ,ｂｕｔｔｈｅｍａｇｎｅｔｉｃｃｒｙｓｔａｌｏｆＳｍＦｅ2 ｈａｓｌｅｓｓａｎｉｓｏｔｒｏｐｙａｎｄｔｈｅｍａｇｎｅｔｏｓｔｒｉｃｔｉｓｎｅｇａｔｉｖｅ .Ｈｅｎｃｅ ,ｔｈｅＳｍＦｅ2 ｃａｎｂｅａｐｐｌｉｅｄｔｏｔｈｅｉｎｔｅｌ ｌｉｇｅｎｔｍａｔｅｒｉａｌｓｓｕｃｈａｓｔｙｐｉｎｇｈｅａｄ…     

Electrodeposition of Rare Earth Metals and Their Alloys

ＥｌｅｃｔｒｏｄｅｐｏｓｉｔｉｏｎｏｆＲａｒｅＥａｒｔｈＭｅｔａｌｓａｎｄＴｈｅｉｒＡｌｌｏｙｓＹａｎｇＱｉｑｉｎ，ＬｉｕＧｕａｎｋｕｎ，ＴｏｎｇＹｅｘｉａｎｇ，ＡｏＹａｎｂｉｎｇａｎｄＳｕＹｕｚｈｉ（杨绮琴）（刘冠昆）（童叶翔）（敖炎兵）（苏育志）...     

Preparation of Rarc Earth Alloys by Cathodic Alloying

ＰｒｅｐａｒａｔｉｏｎｏｆＲａｒｃＥａｒｔｈＡｌｌｏｙｓｂｙＣａｔｈｏｄｉｃＡｌｌｏｙｉｎｇＹａｎｇＱｉｑｉｎ；ＬｉｕＧｕａｎｋｕｎ；ＱｉｕＫａｉｒｏｎｇ；ＨｏｎｇＨｕｉｃｈａｎ；（杨绮琴）（刘冠昆）（丘开容）（洪惠婵）ＴｏｎｇＹｅｘｉａｎｇａｎｄＳ...     

铥离子在氯化物熔体中还原的电化学行为

用循环伏安法、恒电位电解断电后的电位一时间曲线及Ｘ射线衍射法研究Ｔｍ３＋在氯化物熔体中还原的电极过程。在Ｗ，Ｍｏ电极上Ｔｍ３＋首先还原为Ｔｍ２＋，然后析出金属Ｔｍ．在Ｎｉ电极上形成Ｔｍ－Ｎｉ合金后才析出金属Ｔｍ测定了Ｔｍ３＋在氯化物熔体中的扩散系数及扩散活化能，得到１ｎＤ＝－４．３５－５８．２×１０３／ＲＴ．