Effect of Al, Fe Addition on Thermodynamic Stability and Hydrogen Desorption KInetics from MgH2 Phase OF Mechanical Alloy
Journal Title: Фізика і хімія твердого тіла - Year 2015, Vol 16, Issue 3
Abstract
With the aim of lowering the temperature, improve the kinetics of the decomposition of stoichiometric hydride MgH2 was investigated the possibility of its complex doping Al, Fe using mechanochemical synthesis (RMS). The MA1 sample was derived by reactive milling Mg + 10 wt% Al + 10 wt. % Fe powder mixture in the hydrogen atmosphere at pressure of 1.2 MPa in a reactor for 10 h. The formation (in conditions of mechanochemical synthesis) of hydride of solid solution of Al and Fe in magnesium Mg(Al,Fe)H2 was experimentally checked. Found that adding to magnesium Al & Fe leads to lower of thermodynamic stability and, consequently, to lower the temperature of the beginning of desorption of hydrogen to 250 0C at 0,1MPa H2 (compared to MgH2 without Al and Fe). After the first cycles of hydrogenation-dehydrogenation from gas phase MA, established by isobaric thermal desorption spectroscopy, the effect of lowering the temperature of the beginning desorbtion 315 0C (for non-alloy phase MgH2) to 250 0C was observed. Adding to magnesium aluminum with Fe significantly improves the kinetics of desorption of hydrogen from the hydride phase MgH2 mechanical alloy produced by RMS.
Authors and Affiliations
О. G. Еrshova, V. D. Dobrovolsky, Yu. М. Solonin, A. Yu. Koval
Keywords
Related Articles
- EP ID EP296718
- DOI 10.15330/pcss.16.3.576-585
- Views 50
- Downloads 0
Research of Formation of Enamel Coverings on Aluminium
Violation of the integrity of the coating and, consequently, the appearance of various defects help to reduce the dielectric characteristics of the coatings. Establishment of intercommunication, between technological pro...
Thermodynamic Properties of Intermediate Phases of the Ag-Bi-Se System in the Temperature Range 535-578 K
In the galvanic elements C|Ag|AgI|glass Ag2GeS3|D|C (C – current electrodes, D – heterophase alloys of the Ag–Bi–Se system, AgI|glass Ag2GeS3 – two layer membrane with pure ionic (Ag+) conductivity) synthesis Ag with het...
Inflence of Electric Field on the Melting Characteristics Burning Wax
A study of influence of homogeneous electric-field is undertaken on the processes of melting and burning of particles to the octadecane in mid air. It is shown that in the electric field on the initial stage diminishes s...
Surface Layers and Thermoelectric Properties of Vapor-Phase Condensation LAST Pb18Ag2-xSbxTe20 on Mica
The thermoelectric properties of thin films Pb18Ag2-xSbxTe20, obtained by condensation of vapor on the high vacuum on mica substrate are researched. Based on a two-layer model Petrits are founded electrical parameters of...
Edge Absorption of thin Films b–Ga2O3
Fundamental absorption edge of b–Ga2O3 thin films, obtained by radio-frequency ion-plasmous sputtering, was investigated, using the method of optical spectroscopy. It was ascertained that the optical band gap Eg increase...