Abstract
The crystallization of FeSiBGaNb amorphous alloys and their magnetic properties were investigated. The crystallization of the alloy is affected significantly by the amount of Ga it contains. The alloys containing 3–6 at.% Ga initially crystallize forming uniformly fine b.c.c. grains embedded in an amorphous matrix, and eventually transform into a mixed phase at higher temperatures. The diameter of the b.c.c. grains ranges from 10 to 20 nm. The mixed phase consists of b.c.c. Fe, Fe 2B and a crystalline phase with a large hexagonal unit cell of which the a and c lattice parameters are approximately 1.23 and 0.77 nm respectively. The alloys with fine grain structure exhibit a coercivity of less than 0.1 Oe, and the minimal coercivity of around 15 mOe is obtained at compositions in the range 10%–13% Si and 4%–6% Ga.
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