Synthesis and absorption spectra of large homogeneous single crystals of forsterite doped with manganese

摘要: Abstract In synthetic single crystals of the olivine group, a strong compositional zoning along growth direction has often been observed. Here we have synthesized large homogeneous forsterite doped with manganese (50 mm×150–200 mm) by Czochralski method using volume crucible, at ∼1950 °C in an N 2 atmosphere. The size this study is largest reported. parts as-grown compositions (Mn 0.004 Mg 0.996 ) SiO 4 and 0.011 0.989 are as 20×20×50 mm 3 [ x =0.0040±0.0004 1− ] 12×12×30 mm =0.011±0.001], respectively. were prepared to allow for accurate measurements physical properties their anisotropies pure Mn bearing forsterite, extract effect itself, ultimately Earth's mantle. polarized absorption spectra measured evidence anisotropy, clear pleochroism was