Abstract
• Use of square wave voltammetry in LiF-NdF 3 -Nd 2 O 3 to evidence the oxide oxidation into O 2. • A calibration curve to monitor the in-situ oxide content was obtained. • Oxide solubility determination at different temperatures verified by elemental oxygen analysis. • In-situ electrochemical method for oxide monitoring in LiF-NdF 3 -Nd 2 O 3 is proposed. Neodymium oxide titration was investigated in the LiF-NdF 3 -Nd 2 O 3 melt on platinum electrode by square wave voltammetry (SWV) in order to develop an in-situ and fast technique for oxide amount monitoring during Nd or Nd-Fe production by electrolysis. The methodology was verified by elemental analyses in the 850–1050 °C temperature range and then applied to Nd 2 O 3 solubility determination in LiF-NdF 3 .
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