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The crystal structure and energy gap of Ba 1−x Sr x Si 2 (x=0.20 and 0.41), a promising material for solar cells, have been investigated. Ba 1−x Sr x Si 2 has the BaSi 2 -type structure (orthorhombic, Pnma, Z=8, a=8.8258(7), b=6.6736(4), c=11.4364(8)Å for x=0.20, a=8.7466(4), b=6.6278(3), c=11.3553(5)Å for x=0.41). The unit cell volume decreases...
The ternary silicides LaAl 2−x Si x with x ranging from 0 to 1.03 were synthesized by Ar-arc melting. The crystal structure of LaAl 2−x Si x depends on the Si content x: the Cu 2 Mg-type structure for 0≤x≤0.005, the AlB 2 -type for 0.14≤x≤0.62, and the α-ThSi 2 -type for 0.72≤x≤1.03. The range of x at which the AlB 2 phase appears was...
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