Low-Temperature Phase Formation in the BaF2–LaF3 System
Inorganic Materials(2023)
Abstract
Barium lanthanum fluoride powders have been prepared by reacting barium nitrate and lanthanum nitrate in molten sodium nitrate at 350 and 450°C, using a sodium fluoride as a fluorinating agent. A fivefold excess of sodium fluoride has been shown to prevent pyrohydrolysis. We have identified a phase of variable composition with the fluorite structure, Ba1–xLaxF2+x (0.3 < x < 0.5), which has high ionic conductivity (2.3 × 10–4 S/cm at 500 K) and an activation enthalpy for ionic transport of 0.50 ± 0.01 eV.
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Key words
barium fluoride,lanthanum fluoride,fluorite,hydrolysis,molten salt synthesis,sodium nitrate,ionic conductivity
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