S.Q. Li
,
J.I. Dickson and J.P. Bailon (Central Iron and Steel Research Institute (CISRI)
,
Beijing 100081
,
China)(Ecole Polytecnique de Montreal
,
Montreal H3C 3A7
,
Canada)
金属学报(英文版)
The microfractography of transgranular stress corrosion cracking (TSCC) of 70Cu-30Zn a-brass in ammoniacal solution was studied. The observations indicate that on a very microscale, the crack path of TSCC of or-brass follows {111} planes. The crack path very often alternates between {111} Planes to result in "cleavage-like"facet, the usual average orientation of which is {110} with preferential microscopic crack propagation in (100) and (112) directions. The average orientation of wide secondary facets is often close to {100}. The size of {111} microfacets increases with incrmsing stress intensity K, which indicates that the microscopic crack path follows {111} planes on which some localized slip has occurred. Possible TSCC mechanisms which appear to be consistent with the microfraphic features observed in the present study are also discussed.
关键词:
fractography
,
null
,
null
,
null
杨德俊
,
李旭
,
李强国
,
肖圣雄
,
张应军
,
黄熠
中国稀土学报
将六水氯化钐,水杨酸与硫代脯氨酸3种物质一起反应,制得了一种新的稀土三元固体配合物[Sm(C7H5O3)2(C4H6NO2S)]·2H2O(s).通过红外光谱、热重差热分析、元素分析等手段确定了其结构与组成.在常压、298.15 K下,分别测定了六水氯化钐、水杨酸、硫代脯氨酸和该配合物在混合溶剂(二甲亚砜:乙醇:3 mol·L-1HCI=1:1:1)中的溶解焓,并根据热化学原理得出了298.15 K时配合物[Sm(C7H5O3)2(C4H6NO2S)]·2H2O(s)的标准摩尔生成焓△fHθm=(-2913.73±3.10)kJ·moL-1.
关键词:
稀土配合物
,
六水氯化钐
,
硫代脯氨酸
,
水杨酸
,
热化学
黄熠
,
李强国
,
肖圣雄
,
李旭
,
叶丽娟
,
杨德俊
,
魏得良
,
刘义
稀有金属
doi:10.3969/j.issn.0258-7076.2006.03.019
研究由七水氯化镧与水杨酸、8-羟基喹啉反应合成镧与水杨酸、8-羟基喹啉多元混合配合物,并对该配合物进行表征.测定该合成反应的标准摩尔反应焓以及配合物的标准摩尔生成焓.通过红外光谱、元素分析、摩尔电导率、差热热重分析以及化学分析等方法来确定配合物的组成.应用溶解量热法分别测定了七水氯化镧、水杨酸、8-羟基喹啉和配合物在298.15 K、混合量热溶剂(VDMF:VEtOH:VHClO4=1:1:0.5)中的标准摩尔溶解焓.通过设计热化学循环,根据盖斯定律计算了合成反应的标准摩尔反应焓以及配合物的标准摩尔生成焓.该配合物的分子式是La(C7H5O3)2·(C9H6NO).各物质的溶解焓分别为△sH(I○)mLaCl3·7H2O(s),298.15 K]=-96.45±0.18 kJ·mol-1,△sH(I○)m[2 C7H6O3(s),298.15 K]=14.99±0.17 kJ·ml-1,△SH(I○)m[C9H7NO(s),298.15 K]=-3.86±0.06kJ·mdl-1及△S(I○)m[La(C7H5O3)2·(C9H6NO)(s),298.15K]=-117.78±0.11kJ·mol-1.反应LaCl3·7H2O(s)+2C7H6O3(s)+C9H7NO(s)=La(C7H5O3)2·(C9H6NO)(s)+3HCl(g)+7H2O(1)的标准摩尔反应焓为91.57±0.33 kJ·mol-1.La(C7H5O3)2·(C9H7NO)(s)的标准摩尔生成焓为△sH(I○)m[La(C7H5O3)2·(C9H6NO)(s),298.15 K]=-2076.5±3.9 kJ·mol-1.
关键词:
七水氯化镧
,
水杨酸
,
8-羟基喹啉
,
标准摩尔生成焓
Journal of Magnetism and Magnetic Materials
First-principles full potential linearized augmented plane wave (FPLAPW) calculations have been performed to study the electronic structure and the magnetic properties of 3-Cyanobenzo-1,3,2-dithiazolyl,C7H3S2N2. The density of states (DOS), the total energy of the cell, and the spontaneous magnetic moment of C7H3S2N2 were all calculated. The calculations reveal that the low-temperature phase of the compound C7H3S2N2 has a stable metal-antiferromagnetic ground state, and there exists an antiferromagnetically coupled interactions between the dithiazolyl radical(1), which is in good agreement with experiment. (C) 2006 Elsevier B.V. All rights reserved.
关键词:
first-principles;antiferromagnetic states;hybridization;organic;magnets;charge-transfer salts;temperature
蔡铁军
,
申晓明
,
吕数子
,
彭振山
,
刘金
,
邓谦
应用化学
doi:10.3724/SP.J.1095.2011.00345
采用水热法合成了一种新的3-氨基吡啶砷钼多金属氧酸盐配合物(C5H7N2)3(AsMo12O40)·3C5H6N2·2H2O.通过单晶X射线衍射、红外光谱、紫外光谱和差热-热重对其进行了表征.用催化消除丙酮的反应为模式反应,测试了配合物的催化性能.研究结果表明,标题配合物是由Keggin结构[AsMo12O40]3-杂多阴离子、[C5H7N2]+阳离子、[C5H6N2]分子和结晶水分子组成.配合物属于单斜晶系,P21/n空间群;晶胞参数a＝1.33820(12)nm,b＝2.2542(2)nm,c＝1.9848(2)nm,β＝100.27(3)°,V＝5.8912(10)nm3,Z＝4,Rgt(F)＝0.0590,wRref(F2)＝0.1882.配合物对催化消除丙酮具有较好的的活性,催化实验结果表明,160℃下,0.20 g的催化剂可将初始浓度均为1.3 g/m3,流速为4.5 mL/min的丙酮完全消除.
关键词:
多金属氧酸盐
,
丙酮
,
水热合成
,
晶体结构
,
催化性能
张秀英
,
李书静
稀有金属
doi:10.3969/j.issn.0258-7076.2005.06.015
2,6-吡啶二甲酸钠与三氯化镓在pH≈3的条件下直接反应,合成了NaGa(C7H3NO4)2·2H2O配合物单晶.通过元素分析、红外及X射线衍射分析确定了配合物的结构.以该配合物作为催化剂,用罗丹明B模拟染料废水进行了光催化降解脱色试验,对影响反应的各种条件(如催化剂的投加量,染料的初始浓度,通氧速率及光源)进行了考察.结果表明,在催化剂为20mg,染料初始浓度为2.0×10-4mol·L-1,通氧速率为200ml·min-1,光源为500W汞灯时,配合物NaGa(C7H3NO4)2·2H2O具有优良的催化活性,1h内对罗丹明B的降解率可达98.9%.
关键词:
配合物
,
光催化降解
LI Yuqing WANG Cirong GU Zhaofeng Research Institute of Daye Steel Works
,
Huangshi
,
China Senior Engineer
,
Research Institute of Daye Steel Works
,
Huangshi 435001
,
China
金属学报(英文版)
Determination of(Fe,Cr)_7C_3 in Cr27 cast iron results about 30 v.-%.Minor Si and Mn are present.Sectional area of the M_7C_3 grains is 1—50μm~2.Combining matrix analysis of elec- tron diffraction pattern with calculated angle between plane traces,{011}twins and also {013}twins producing local environment for Ru_7B_3 are observed in the orthorhombic M_7C_3. A crystallographic model for M_7C_3 is proposed.
关键词:
cast iron
,
null
,
null
,
null
,
null
朱新锋
,
王现丽
,
聂鹏茹
,
张伟
,
胡雨辰
,
杨家宽
,
汪潇
,
郭一飞
中国有色金属学报
借助热天平与红外光谱仪联用仪、X射线衍射仪、扫描电镜分析手段研究柠檬酸铅Pb3(C6H5O7)2·3H2O的热分解过程和产物。结果表明：柠檬酸铅Pb3(C6H5O7)2·3H2O的热分解过程分水分脱除、无水物分解和燃烧3个阶段；结晶水在无水物分解阶段散失，温度达到100~200℃时产生部分有机物，超过此温度时产物主要是CO2，最终产物为氧化铅与金属铅；柠檬酸铅在空气中分解受焙烧温度影响较为显著，柠檬酸铅前驱物Pb3(C6H5O7)2·3H2O低温焙烧时产物的主要成分是α-PbO、β-PbO与金属铅，高温焙烧时产物主要成分是β-PbO。
关键词:
柠檬酸铅
,
热分解
,
机理
,
铅膏中间产物
柏
,
高慧
,
党东宾
,
张国强
人工晶体学报
合成了超分子化合物(C_(12)H_(10)N_4)(C_7H_6O_3)_2,并进行了元素分析、红外光谱、紫外光谱表征和单晶X射线衍射分析.构筑单元之间通过多重氢键和π-π堆积作用的协同效应形成超分子化合物,并研究了化合物的固体荧光性能.研究表明:该晶体属于单斜晶系P2_1/c空间群,晶胞参数为:a=0.3974(1) nm,b=2.0330(2) nm,c=1.4343(1) nm, β=94.892(2)°,V=1.15440(19) nm~3,d_c=1.400 g/cm~3,Z = 2,μ= 0.102 mm~(-1),F_((000))=508,R_1=0.0359,wR_2=0.0893 [I>2σ(I)].
关键词:
超分子化合物
,
晶体结构
,
荧光性质
