New compounds of the type REBa(2)VO(4)F(4) where RE = Y, Eu and Sm hav
e been prepared for the first time by reacting REBa(2)VO(6) with NH4HF
2 used as a low-temperature fluorinating agent. Thermogravimetric anal
ysis/differential thermal analysis, chemical analysis, Eu-151 Mossbaue
r and EPMA evidence for the formation of the fluorinated compound is p
resented.