The effects of oxidized and oxide-free boron on the Mg-B-H nanohydrides transformation in the nearly nanosized powders

被引：2

作者：

Varin, R. A. ^{[1
]}

Chiu, Ch. ^{[1
]}

Wronski, Z. ^{[2
]}

Calka, A. ^{[3
]}

机构：

[1] Univ Waterloo, Dept Mech Engn, Waterloo, ON N2L 3G1, Canada

[2] Natl Resources Canada, CANMET, Mat Technol Lab, Ottawa K1A 0G, ON, Canada

[3] Univ Wollongong, Dept Mat Sci & Engn, Wollongong, NSW, Australia

来源：

DOPED NANOPOWDERS: SYNTHESIS, CHARACTERISATION APPLICATIONS | 2007年 / 128卷

关键词：

hydrogen storage materials; Mg-B-H system; oxidized and non-oxidized boron; amorphous hydride; magnesium diboride;

D O I：

10.4028/www.scientific.net/SSP.128.47

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this work oxidized and oxide-free amorphous boron (a-13) powder and elemental Mg were used in an attempt to directly synthesize the Mg(BH4)(2) complex hydride by controlled reactive mechanical alloying (CRMA) under hydrogen in a magneto-mill up to 200h. The particle size was refined to the 100-200nm range. Nanocrystalline MgH2(similar to 6nm crystallite size) was formed within the particles when an oxidized a-13 is used. In contrast, a mixture of MgB2 and an amorphous hydride MgHx was formed when an oxide-free a-13 was used. Differential scanning calorimetry (DSC) test up to 500 degrees C produced a single enclothermic heat event at 357.7 degrees C due to hydrogen desorption. In addition, desorption conducted in a Sieverts-type apparatus revealed similar to 1.4wt.% of hydrogen release. The X-ray diffraction pattern after DSC test of the 200h milled sample made with oxide-free boron showed the presence of MgB2.

引用

页码：47 / +

页数：2

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