Solid State Science and Technology, Vol. 19, No 1 (2011) 15-19

ISSN 0128-7389

SYNTHESIS OF MgB2 FROM MgB4 THROUGH COMBINATORIAL SOLID STATE REACTION ROUTES

K. L. Tan*, K. Y. Tan, K. P. Lim, S. A. Halim and S. K. Chen

Physics Department, Faculty of Science, Universiti Putra Malaysia

43400 Serdang, Selangor, Malaysia

ABSTRACT

MgB4 was first prepared from the elemental magnesium and boron powders, followed

by acid-washed in order to remove the primary impurity of MgO. In the second step,

appropriate amount of Mg was added into the MgB4 powders and sintered in the

temperature range of 650C to 950C for 8 hours. XRD spectra showed that MgB2

appeared as the main phase. The relative intensity fraction for MgB2 was found to

decrease while this value was increased for MgB4 and MgO upon increasing the

sintering temperature. Scanning electron microscopy showed a denser microstructure

compared to samples prepared by direct in-situ reaction of (Mg + 2B). The density was

found to decrease with increasing sintering temperature possibly due to the loss of Mg.

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