Preparation of High-Purity Indium and Gallium via Electrotransfer in a Magnetic Field

High-purity (7N) indium and gallium are obtained via electrotransfer in melts placed in a static transverse magnetic field. The resistance ratios of the indium and gallium thus purified (25 000 and 85 000, respectively) are larger than in commercial grades of these metals. The magnetoresistance of liquid gallium is measured as a function of magnetic field. A multiband model for the Fermi surface of liquid gallium is proposed, which includes an electronic sphere of radius kFe = 1.654 × 108 cm–1 and a spherical hole shell of thickness Δk = 0.5 × 108 cm–1 and radius kFh = 1.114 × 108 cm–1. The model accounts for the observed magnetoresistive response of liquid gallium in a transverse magnetic field.