Phase equilibria in the RbF-PrF3 system are studied by differential thermal
analysis (DTA) and X-ray powder diffraction. Compounds Rb3PrF6, Rb2PrF5, R
bPrF4, and RbPr2F7 were identified. Variations in the stability of the comp
ound in the RbF-RF3 (R is lanthanide) series are considered.