Raman spectra for β-FeSi2 bulk crystals

Complete determination of all Raman active lines in the range between 180 and 480 cm−1 for an orthorhombic β-FeSi2 lattice has been performed by accurate polarized Raman measurements on β-FeSi2 and a crystal rotation method along the 〈111〉 axis. The 20 Raman active lines including 7 new lines in the range between 180 and 480 cm−1 were observed. Further polarization relations for each observed Raman lines were analyzed from their intensity changes as a function of crystal rotation angle. The components of the Raman tensor of β-FeSi2 were discerned from the polarization curves.