Open AccessA Novel Synthesis Pathway Towards Rare Earth Fluorides by Using Liquid and Solid State Hexafluorophosphate Salts
Author(s) -
Andre Bents,
Josef Maximilian Gerdes,
Michael Ryan Hansen,
Thomas Jüstel,
Florian Baur
Publication year - 2021
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/abe8bc
Subject(s) - hexafluorophosphate , chemistry , rare earth , hydroxide , solid state , yield (engineering) , inorganic chemistry , salt (chemistry) , ionic liquid , oxygen , liquid state , solid state nuclear magnetic resonance , nuclear chemistry , materials science , organic chemistry , mineralogy , catalysis , nuclear magnetic resonance , metallurgy , physics
This work concerns different methods to synthesize rare earth fluorides by using liquid and solid state hexafluorophosphates. Various [PF 6 ] − sources were compared, i.e. [BMIM][PF 6 ], [TBA][PF 6 ] and KPF 6 . Furthermore, the required reaction times and temperatures have been determined by XRD measurements. It turned out that [TBA][PF 6 ] reacts even in the solid state at moderate temperatures to yield single phase LaF 3 . The use of hydroxides and oxides instead of the commonly employed nitrates as rare earth educts was successfully attempted. The reaction with rare earth hydroxide showed some peculiarities which were traced back to the specific reaction between HF and OH − . The reaction between [TBA][PF 6 ] and La(OH) 3 was studied in detail via the determination of oxygen and nitrogen concentrations as well as solid-state 19 F and 139 La nuclear magnetic resonance (NMR).