ELECTROLYTIC METHOD FOR SYNTHESIS OF PRASEODYMIUM HEXABORIDE

摘要

FIELD: chemistry. ^ SUBSTANCE: invention relates to electrolytic methods for synthesis of inorganic compounds, particularly praseodymium compounds. Combined electrodeposition of praseodymium and boron from chloride complexes at the cathode and their subsequent reaction at the atomic level to form praseodymium boride takes place in an atmosphere of cleaned and dried argon from a molten equimolar mixture of potassium and sodium chlorides which contains praseodymium chloride and potassium fluoroborate. Temperature is kept above melting point of the molten equimolar mixture of potassium and sodium chlorides. The ratio of components in the molten mixture is as follows, in wt %: praseodymium 1.6-5.0, potassium fluoroborate - 4.0-11.0, equimolar mixture of potassium and sodium chlorides - the rest. Synthesis is carried out at current density of 0.1-1.0 A/cm2 and electrolysis potential relative the platinum reference electrode from -2.5 to -4.0 V. ^ EFFECT: lowering of synthesis temperature to 700-800C and obtaining the end product in pure form. ^ 4 ex