LaCl3—MgCl2—LiCl三元体系液相限的研究

借助DTA研究了LaCl_3-MgCl_2-LiCl三元体系的液相限,发现本体系内有对应于LaCl_3和α-固溶体(MgCl_2,LiCl)的两个液相面,一条二次结晶线和它的一个最低点M(63.8wt-%LaCl_3,2.0wt-%MgCl_2,34.2wt-%LiCl;492℃),结合液相限的测定,初步探讨了LnCl_3-MgCl_2-LiCl体系(Ln=La,Ce,Pr及Nd)相图中的某些变化规律。     

LIQUIDUS OF NdCl_3-MgCl_2-LiCl SYSTEM

The liquidus of ternary system NdCl_3-MgCl_2-LiCl has been determined by means of DTA.Itwas found that there are two surfaces corresponding to the primary crystallization ofNdCl_3 and α-(MgCl_2,LiCl)respectively,and a univariant line related to the secondarycrystallization with a minimum M(68.5 wt-% NdCl_3,2.7 wt-% MgCl_2,28.8 wt-% LiCl_2441℃)in the system.     

Ndcl3—Mgcl2—Licl系液相限的研究

本文借助于DTA研究了NdCl_3-MgCl_2-LiCl三元体系的液相限。发现:本体系内有对应于NdCl_3和α-固溶体(MgCl_2,LiCl)的两个液相面和一条带有最低点的二次结晶线,其最低点M的组成与温度为:68.5wt-％NdCl_3,2.7wt-％MgCl_2,28.8wt-％LiCl;441℃。     

PrCl3—CaCl2—MgCl2三元体系相图的研究

本文借助于DTA研究了PrCl_3-CaCl_2-MgCl_2三元体系相图发现:本体系属简单低共熔型相图。体系内有对应于PrCl_3,CaCl_2和MgCl_2的三个液相面,三条二次结晶线和一个三元低共熔点E(44.8wt-％PrCl_3,31.8wt-％CaCl_2,546℃)。     

AN INVESTIGATION ON PHASE DIAGRM OF TERNARY SYSTEM CeCl_3-BaCl_2-LiCl

ＡＮＩＮＶＥＳＴＩＧＡＴＩＯＮＯＮＰＨＡＳＥＤＩＡＧＲＭＯＦＴＥＲＮＡＲＹＳＹＳＴＥＭＣｅＣｌ＿３－ＢａＣｌ＿２－ＬｉＣｌＡＮＩＮＶＥＳＴＩＧＡＴＩＯＮＯＮＰＨＡＳＥＤＩＡＧＲＭＯＦＴＥＲＮＡＲＹＳＹＳＴＥＭＣｅＣｌ＿３－ＢａＣｌ＿２－ＬｉＣｌ￥Ｚｈ...     

PHASE DIAGRAM OF TERNARY SYSTEM PrCl_2-CaCl_2-MgCl_2

Three surfaces corresponding to the primary crystallization of PrCl_3,CaCl_2 andMgCl_2 respectively,3 univariant curves related to the secondary crystallization and a ternaryeutectic(44.8 wt-% PrCl_3,31.8 wt-% CaCl_2,546℃)were found in systemPrCl_3-CaCl_2-MgCl_2 by means of DTA.A reaction occurs in this system:L=PrCl_3+CaCl_2+MgCl_2.     

PHASE DIAGRAMS OF SYSTEMS SmCl_3-CaCl_2 AND SmCl_3-LiCl

The phase diagrams of binary systems SmCl_3-CaCl_2 and SmCl_3-LiCl were determined byDTA and X-ray diffraction analysis.The system SmCl_3-CaCl_2 is of a simple eutectic typewith eutectic point of 55.8mol-% SmCl_3 at 545℃.The system SmCl_3-LiCl is of the typewith incongruent melting phase 2SmCl_3·LiCl at peritectic point 434℃ and with eutecticpoint of 31.5 mol-% SmCl_3 at 395℃.     

Phase Diagram of Ternary System ErCl_3-CaCl_2-MgCl_2

ＰｈａｓｅＤｉａｇｒａｍｏｆＴｅｒｎａｒｙＳｙｓｔｅｍＥｒＣｌ＿３－ＣａＣｌ＿２－ＭｇＣｌ＿２ＳｏｎｇＸｉｕｑｉｎａｎｄＺｈａｎｇＣｈａｏｇｕｉ（宋秀芹）（郑朝贵）ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＰｅｋｉｎｇＵｎｉｕｅｒｓｉｔｙ，Ｂｅｉｊ...     

SmCl_3-CaCl_2及SmCl_3-LiCl体系相图的研究

用DTA和X射线衍射方法研究了 SmCl_3-CaCl_2及SmCl_3-LiCl二元体系相图.发现前者属于简单低共熔型,低共熔点e_1为55.8mol%SmCl_3,545℃;后者属于有化合物分解的相图类型,该异分熔点化合物为Sm_2LiCl_7,分解温度434℃,转熔点p组成为39.0mol％SmCl_3.低共熔点e_2为31.5mol％SmCl_3,395℃。     

PrCl3—SrCl2—CaCl2系相图

借助于DTA研究了PrCl_3-SrCl_2-CaCl_2体系相图。发现有对应于PrCl_3,Sr_3PrCl_9,α(SrCl_2,CaCl_2),α_1(CaCl_2,SrCl_2)和α_2(SrCl_2,CaCl_2)的五个液相面,六条二次结晶线,一个三元低共熔点E(48.0wt-％PrCl_3,23.5wt-％SrCl_2;590℃)和三元转熔点P(45.5wt-％PrCl_3,24.5wt-％SrCl_2;614℃)。并试图用极化与反极化作用探讨含稀土相图、化合物生成及其稳定性变化的规律。     

PHASE DIAGRAMS OF THE BINARY SYSTEMS TbCl_3-MCl_n(M=Li,Mg,Ca,Pb;n=1 or 2)

The phase diagrams of the binary systems RECl_3-MCl_n(M=Li,Mg,Ca,Pb;n=1 or 2)were investigated bymeans of DTA and X-ray diffraction analysis.It was found that they are of simple eutectic type with eutectic points50.1 Mol.-% TBCl_3(445℃),67.5Mol.-% TbCl_3(589℃),65.9Mol.-% TbCl_(563℃)and 35.6 Mol.-%TbCl_3(445℃)respectively.Unstable compounds,formed in the solid slate,are MgTbCl_7,CaTb_2Cl_8,LiTb_2Cl_7 andPbTbCl_5.Their decomposition temperatures are 388℃ with a phase transition at 352,500 and 521℃ with a phasetransition at 483 and 405℃ respectively.Some rules of the phase diagrams were explored.     

LIQUIDUS OF SYSTEM Ag-Cu-Ge

The diagram of Ag-Cu-Ge system was constructed from the investigation of 13 internal sec-tions by DTA heating as well as cooling curves in an atomsphere of dry N_2 . The phase dia-gram is subdivided into two pseudo-ternary systems shown as Ag-Cu-Cu_3Ge andAg-Cu_3Ge-Ge. Both systems belong to simple eutectic type. The ternary eutectic points liein." E_1, Ag(22.0)-Cu(58.8)-Ge(19.2), 632℃ and E_2 , Ag(44.3)-Cu(29.5)-Ge(26.2), 533℃.The three side binary systems were redetermined.     

EuCl3—CaCl2二元系相图

用差热分析法研究了ＥｕＣｌ３ＣａＣｌ２二元体系相图，发现该体系有一个异份熔化化合物ＥｕＣｌ３·３ＣａＣｌ２。体系转熔点为５７０℃，ＥｕＣｌ３摩尔分数４５．４％；低共熔点为５２２℃，ＥｕＣｌ３摩尔分数６６．８％。     

Bi-Pb-Tl三元系相图

用室温、高温X射线衍射及淬火的方法,测定了Bi-Pb-Tl三元系25℃的等温截面及该体系中的相结构。     

Ag—Cu—Si三元合金体系液相线

采用ＤＴＡ法测定了富Ａｇ－Ｃｕ区的Ａｇ－Ｃｕ－Ｓｉ三元合金系的液相面。Ａｇ－Ｃｕ－Ｓｉ三元系被Ａｇ－Ｃｕ０．７６Ｓｉ０．２４截面分为Ａｇ－Ｃｕ－Ｃｕ０．７６Ｓｉ０．２４及Ａｇ－Ｃｕ０．７６Ｓｉ０．２４－Ｓｉ两个伪三元系,它们各有一个三元低共熔点分别为７４０和７０５℃,相应组成（原子分数）分别为１２．５％Ａｇ＋７１．７％Ｃｕ＋１５．８％Ｓｉ和３０％Ａｇ＋４４．７％Ｃｕ＋２５．３％Ｓｉ。     

RECl_3-CaCl_2-MgCl_2 TERNARY PHASE DIAGRAMS(RE:La,Ce,Pr,Nd)

Nine sub-binary phase diagrams of the RECl_3-CaCl_2,RECl_3-MgCl_2 and CaCl_2-MgCl_2 systems,andthermodynamic data for these systems are critically assessed and optimized.Using Hillert model and takingMgCl_2 as an asymmetric component,the ternary phase diagrams or the RECl_3-CaCl_2-MgCl_2 systems are predtcted.As well,the determination of asymmetric component in the asymmetric model is investigated.     

PHASE DIAGRAM OF Bi-Pb-T1 TERNARY SYSTEM

Isothermal section at 25℃ of phase diagram and phase structure of Bi-Pb-Tl ternary systemhave been studied by means of room and high temperature X-ray diffraction and quenching.     

DISSOLUTION OF La IN KCI-NaCl AND LaCl_3-KCl-NaCl MELTS

Dissolutionof La in KCl-NaCl and LaCl_3-KCl-NaCl melts has been investigated by meansof a transparent cell,cyclic voltammetry and EHMO of quantum chemistry.It is shown thatthe La dissolved in KCl-NaCl melt exists in a metallic state,the La dissolved inLaCl_3-KCl-NaCl melt can be ionized into La~(2+) as a result of reaction with La~(3+),furthermore,the La~(2+) reacts with La~(3+) forming atom cluster La_m~(n+) which is a stable state inthe melt.     

La在KCl-NaCl和LaCl_3-KCl-NaCl熔体中的溶解行为SCIEI

本文利用透明槽技术、电化学循环V-A法及量子化学EHMO三种方法,研究了La在KCl-NaCl(1:1mol)及LaCl_3-KCl-NaCl熔体中的溶解行为。初步认为:溶解在KCl-NaCl熔体中的La是以中性金属状态存在。在LaCl_3-KCl-NaCl熔体中,溶解的La与La^(3+)作用生成低价La^(2+)离子,La^(2+)又与周围的La^(3+)作用形成原子簇离子La_m^(n+)赋存于熔体之中。     

PHASE DIAGRAM OF PrCl_3-SrCl_2-CaCl_2 SYSTEM

Five fields corresponding to the primary crystallization of PrCl_3,Sr_3PrCl_9,α(SrCl_2,CaCl_2),α_1(CaCl_2,SrCl_2)and α_2(SrCl_2,CaCl_2)respectively,six univariant lines relatedto the secondary crystallization,one ternary eutectic(48.0 wt-％ PrCl_3,23.5 wt-％ SrCl_2;590℃)and ternary peritectic point(45.5 wt-％ PrCl_3,24.5 wt-％ SrCl_2;614℃)were determined by DTA.Attempts were also made to explore the rule governing thealteration in the phase diagram containing rare earth chloride,formation of compoundand its stability by means of polarization and counter-polarization.