LaB6 crystals from fused salt electrolysis

Abstract

Purple crystals of LaB₆ with high melting point (2500 °C) have been elecrotrodeposited from an oxyfluoride melt consisting of La₂O₃–B₂O₃–LiF–Li₂O under an N₂ atmosphere. The growth of LaB₆ crystals has been observed under a controlled electrodeposition process. The cell set-up employed for the electrodeposition consists of a graphite crucible acting both as the cell container and anode and a centrally placed Mo rod acting as cathode. A stainless steel retort was employed to hold the graphite crucible and fix the electrodes under an N₂ atmosphere. The pre-treatment applied to the electrolyte composition before electrolysis has been described. Characterization of the crystalline product by chemical analysis, XRD studies and other physical measurements is reported.