CPC Subgroup
C01F 17/36 halogen being the only anion, e.g. NaYF4
Full Title
Compounds of rare earth metals > Compounds containing rare earth metals and at least one element other than a rare earth metal, oxygen or hydrogen, e.g. La4S3Br6 (C01F17/247 - C01F17/294 take precedence) > halogen being the only anion, e.g. NaYF4