Fig. 2

Laser treatment of composite fibres; a images of thermal emission during initial heating of the fibre; solid Si is brighter than liquid GaSb/Si alloy due to higher emissivity, b XCT of fibre after heating and translation to accumulate GaSb (scale bar 350 µm), c EDX elemental maps of silicon and GaSb regions after translation; red arrows show where cross-sections were prepared (scale bar 100 µm), d θ-2θ of the segregated fibre, e intensities of X-ray peaks after anneal (blue-Si, red-GaSb), compared to powder files (grey). The maximum numbers of counts for the fibre are in parentheses (f) {220} peak intensities during a slow axial rotation