Ynthesis and Characterization of Nonstructural MG2NI with Replacement Diffusion Method

Yanqiu Jin,Wenjuan Zhang,Yaoming Wu,Yunhui Li,Xiuyun Yang,Limin Wang

doi:10.5539/mas.v4n8p114

Abstract

Nonstructural Mg2Ni powder was prepared by replacement-diffusion method. The structure of the Mg2Ni powder was investigated by X-ray diffraction and transmission electron microscopy. Crystallographic structure analysis showed that the synthesized sample powder was constituted with Mg2Ni and a small fraction of MgO. The TEM image in low-resolution indicated that the diameter of the synthesized Mg2Ni powder was in the range of 20~80 nm, and the high-resolution transmission electron microscope (HRTEM) image suggested that the interlinear spacing of (113) lattice planes was 0.229 nm, and the specific surface area examined was 50 m2 /g. The electrochemical hydrogen storage capacity of the Mg2Ni power was also measured in this work. It was 82.5 mAh g-1. The reasons of the low capacity hydrogen storage and decrepitating were analyzed, and the mainly cause were the grievous oxidation of the powder and the pulverization.

Highlights

In recently years, many researchers are increasingly interested in researching magnesium and Mg-based Materials for hydrogen storage (Ebrahimi-Purkani,2008,p.211) .(Gennari,2008,p.425) (Gasiorowski,2008,p.283)Because magnesium and Mg-based materials are considered as prospective candidates for hydrogen storage owing to high theoretic hydrogen storage capacity, light weight and low cost
Our result shows that the factors Human Papilloma Virus (HPV), Multiple partners and Low socio-economic status (SES) are the major factors that will drive to Cervical Cancer
Diagnosing Cervical Cancer with the help of symptoms may some times lead to wrong decisions and over treatment

Summary

Introduction

Many researchers are increasingly interested in researching magnesium and Mg-based Materials for hydrogen storage (Ebrahimi-Purkani,2008,p.211) .(Gennari,2008,p.425) (Gasiorowski,2008,p.283)Because magnesium and Mg-based materials are considered as prospective candidates for hydrogen storage owing to high theoretic hydrogen storage capacity, light weight and low cost. It is difficult to obtain Mg2Ni by conventional melting method because of the large differences in vapor pressure and melting point between Mg and Ni. it is difficult to avoid oxidation of magnesium during the preparation, for example, using mechanical alloying (Zaluski,1995,p.70), bulk mechanical alloying(Aizawa,1999,p.248), vapor phase process (Ueda,2005,p.253), combustion synthesis method (Kodera,2007,p.138), etc. It is difficult to avoid oxidation of magnesium during the preparation, for example, using mechanical alloying (Zaluski,1995,p.70), bulk mechanical alloying(Aizawa,1999,p.248), vapor phase process (Ueda,2005,p.253), combustion synthesis method (Kodera,2007,p.138), etc These are one of aspects resulted in Mg2Ni has not widely applications, besides high working temperature and poor dynamics of desorption hydrogen. It is known that it is more difficult to prepare nonstructural Mg2Ni intermetallic compounds power by conventional melting method except for ball milling method. Nonstructural Mg2Ni powder is prepared by RDM, and the structure and electrochemical hydrogen storage capacity of the powder are investigated

Methods

Results

Conclusion