Position of band (cm⁻¹)

Band assignment

1240

ν_as (P=O)/ν_as ( ${\text{PO}}_2^{-}$ )

1160

ν_s (PO₂)⁻

1100

ν_as (PO₃)²⁻

935 - 920

ν_as (P-O-P)/ν_as(P-O-M) (M = W ∙ Fe)

880 - 870

MO₆ (M = W ∙ Fe)

735

ν_s (P-O-P)

725

(FeO₄)

640 - 630

ν_s (M-O-M) (M = W ∙ Fe)

500 - 425

δ (O-P-O) and translation of cations