Effect of the electrolyte composition on the electrochemical behavior of Nd fluoride complex in a LiF-NdF3-Nd2O3 molten salt

Influence of Rare Earth Oxide Concentration on Electrochemical Co-Deposition of Nd and Pr from NdF3-PrF3-LiF Based Melts

“…With respect to electrolyte composition, it should be noted that the experimentally recorded current densities of the redox processes obtained by CV under the same conditions in the previously reported electrolyte with higher LiF concentration (NdF 3 + PrF 3 + 12.02 wt.% LiF) were substantially lower than those in the electrolyte with a lower concentration of LiF (NdF 3 + PrF 3 + 9 wt.% LiF). This can be attributed to the LiF content in the electrolyte used to dissolve REO because the content of different salts in molten fluoride determines the solubility of REO [8,21,22,[28][29][30]. In the basic electrolyte, mass exchange takes place among the added oxides and existing rare earth fluorides; as a result, an equilibrium chemical composition is formed in the molten electrolyte [8].…”

“…It was suggested that the solubility of rare earth oxides in the electrolyte is limited (approximately 3-5%) and that the optimal LiF concentration in fluoride based baths is up to 12.5 wt.% [28]. Upon entering the molten salt, Nd 2 O 3 dissolves in the presence of NdF 3 and excess F ; as a result, neodymium oxyfluoride is formed [6,21]. Neodymium oxyfluoride then reacts to form NdO + and Nd 3+ , which are converted to metallic Nd at the cathode [6,21,23].…”

“…Upon entering the molten salt, Nd 2 O 3 dissolves in the presence of NdF 3 and excess F ; as a result, neodymium oxyfluoride is formed [6,21]. Neodymium oxyfluoride then reacts to form NdO + and Nd 3+ , which are converted to metallic Nd at the cathode [6,21,23]. In addition, Nd(III) ions with a surplus of Fions form a neodymium fluoride complex.…”

“…Significant work has been done concerning the electrochemistry of each element separately or as part of a group in the corresponding molten salt mixture using molten salt electrochemistry [6,7,11,[17][18][19][20]. However, there has been little related research conducted on selective neodymium/praseodymium electrochemical deposition from oxidefluoride electrolytes [6][7][8][21][22][23]. Currently, industrial production of Nd-Pr alloys is mostly based on the electrochemical processes of oxide-fluoride electrolytes, using PrF 3 -NdF 3 -LiF as the base electrolyte and Nd and Pr oxides as a feedstock.…”

The effect of Nd3+ concentration on fabrication, microstructure, and luminescent properties of anisotropic S‐FAP ceramics

“…Near-infrared (NIR) laser has attracted widespread attention in the past few decades due to its potential application prospects in the fields of biology, optics, and solar energy. [23][24][25][26] The laser transition of Nd 3+ ion which is an excellent doping ion belongs to the strict four level laser system. 27,28 Nd 3+ ion pumping threshold is low and less affected by the external temperature because the laser lower energy level ( 4 I 11/2 ) is far away from the ground state ( 4 I 9/2 ), about 2000 cm −1 .…”