Synthesis Temperature Influence on the AlMgB14 Phase Composition

Abstract

The influence of the synthesis temperature on the phase composition, size distribution, and morphology of AlMgB₁₄ particles, obtained by direct interaction of powders of elementary Al, Mg, and B with the addition of free carbon in vacuum 10 – 2 Pa at 1200 – 1400°C, was studied. The synthesized powders were analyzed by means of x-ray diffraction, SEM, EDX, and laser diffraction. The highest mass content of the main phase AlMgB₁₄ (94%) was obtained at synthesis temperature 1200 – 1300°C with 1 h soaking. Impurity MgAl₂O₄ as well as magnesium-depleted spinel and AlB₁₂ were recorded at soaking temperature above 1300°C.