材料期刊网

Sodium Activity in Molten Aluminum Measured with a Solid Electrolyte

Gang XIE Shanghai Institute of Metallurgy , Academia Sinica , Shanghai , 200050 , ChinaShiyin SHEN Northeast University of Technology , Shenyang , 110006 , China

材料科学技术（英文）

The sodium activities in aluminium in equilibrium with cryolite-alumina melt and during electrolysis were determined by EMF with Naβ-Al_2O_3 solid electrolyte.With this sodium activities,we calculate the activities of NaF and AIF_3 in the cryolite-alumina melt.The potential difference of discharge be- tween sodium ions and aluminum ions at cathode of Hall-Heroult cell was also obtained from the sodium activity in aluminum.

关键词: activity , null , null

Coercivity Mechanism of Melt-spun Nd-Fe-B Bonded Magnet

HUANG Gangxiang XU Qingzhen GAO Huimin YU Shanfu HUA Hongci WANG Geya Shanghai Iron and Steel Research Institute , Shanghai , 200940 , China.Shanghai Institute of Metallurgy , Academia Sinica , Shanghai , 200050 , China.

材料科学技术（英文）

The microstructures of melt-spun Nd_135- Fe_81.74B4.76 ribbons have been investigated by means of X-ray diffraction,Mossbauer spectroscopy and HREM.Experimental results show that optimal magnetic properties of the bond- ed magnet can be obtained by melt-spun alloys at wheel velocity of 24m/s,the microstructure of which was single phase Nd_2Fe_(14)B crystallites,and no other phases,such as Nd-rich,B-rich or x-Fe phase,were present.It is considered that the high intrinsic coercivity ~iH_c can be attributed to the sin- gle-domain behaviour of Nd_2Fe_(14)B crystallite phase.

关键词: coercivity , null

PATTERN RECOGNITION APLLIED TO STABILITY OF FILLED Ti_2Ni PHASES

ZHOU Diangen CHEN Nianyi Shanghai Institute of Metallurgy , Academia Sinica , Shanghai , China professor , Shanghai Institute of Metallurgy , Academia Sinica , Shanghai , 200050 , China

金属学报(英文版)

Pattern recognition method is used for the investigation of stability,region of filled Ti_2Ni phases in multi-dimensional bond-parameter space.The filling of C,N and O atoms into T_6 octahedra consisting of atoms of earhy-transition elements makes the expansion of the stability region of Ti_2Ni phase,and the relative stability of AI_2Cu and MoSi_2 type com- pounds decreases after the introduction of non-metallic elements such as C,N and O.

关键词: filledTi_2Ni phase , null

Influence of the Preparative History on Physico-chemical Properties of Sodium Aluminate Solutions

CHEN Nianyi LIU Miaoxiu YANG Jinxiu ** Shanghai Institute of Metallurgy , Academia Sinica , Shanghai , 200050 , China*** Laboratory of Theoretical Chemistry , Shanghai University of Science and Technology , Shanghai , 200180 , China+ To whom correspondence should be addr

材料科学技术（英文）

关键词: sodium aluminate solution , null , null

Microstructure of the Ionic Discharge of Oxygen on Graphite Anode in Aluminium Electrolysis

By ZHANG Mingjie ZHAI Yuchun OIU Zhuxian LIU Honglin CHEN Nianyi Northeast University of Technology , Shenyang , 110006.China.Shanghai Institute of Metallurgy , Academia Sinica , Shanghai , 200050 , China.To whom correspondence should be addressed.

材料科学技术（英文）

With the SCF-ab initio and EHMO method used in quantum chemistry, the total energy and charge distribution are calculated for O ions which are adsorbed on the different positions of various C lattices. Furthermore, the microstructure is dis- cussed for O ions discharging on the graphite anode.

关键词: ionic discharge , null , null

Activity of NaOH in Sodium Aluminate Solutions

CHEN Nianyi LIU Miaoxiu Shanghai Institute of Metallurgy , Academia Sinica , Shanghai , 200050 , China

材料科学技术（英文）

关键词: sodium aluminate , null , null

Computerized Simulation of Structure of NaAIO_2 Melt

Chi XU Ming LI Nianyi CHEN Shanghai Institute of Metallurgy , Academia Sinica , Shanghai , 200050 , China

材料科学技术（英文）

The structure of NaAlO_2 melt has been studied by computerized simulation using Monte Carlo method.The radial distribution functions and Local structure of this melt are calculated.It has been found that NaAlO_2 melt contains ionic clusters formed by corner-sharing AlO_4 tetrahedra,sodium ions and xNa~+.yO~(2-) ionic clusters.

关键词: computerized simulation , null , null