Abstract
Temperature dependent Raman scattering experiments (up to ∼ 980 °C) have been conducted with heating and cooling samples of Bismuth Germanate (Bi12GeO20) in order to determine its liquid structure and the relevant consequences for crystal growth. The results show that the melt is much richer than could be concluded from X-ray studies. The melt is comprised of large molecules consisting of interlinked units of GeO4 tetrahedrons and oxygen coordinated Bi-centered structures. The size of the molecules is reduced with increasing temperature. Melting occurs when Bi-centered structures connected to the same GeO4 tetrahedron unbound.
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