A novel magnetic phase transition in anhydrous iron (III) phosphate, FePO₄

Hydrothermal Synthesis, Structure, and Characterization of a Mixed-Valent Iron(II/III) Phosphate, NaFe3.67(PO4)3: A New Variation of the Alluaudite Structure Type

“…The hyperfine parameters given in Table 6 are completely consistent with the electronic properties of NaFe (PO ) and with those obtained from related compounds (28)(29)(30)(31)(32). The isomer shifts, , and the quadrupole splittings, E / , for the Fe(1) and Fe(2) sites are clearly indicative of iron (II) in highly distorted octahedral coordination environments (30,31). Indeed, the larger observed quadrupole splitting for Fe(2) is consistent with the larger angular distortion from octahedral symmetry observed for this site (see Table 3 and earlier discussion) as compared with the Fe(1) site.…”

Structural investigation of the alluaudite-like mixed-valence iron phosphate: Na1.25Mg1.10Fe1.90(PO4)3

“…The isomer shift for DS2 (δ 2 = 1.30 mm s −1 ) is consistent with those obtained from other phosphates, for octahedral Fe 2+ ions [14][15][16]. The relative population of Fe 2+ (7.5%) is close to that 8% predicted by the structural refinement.…”

Probing magnetic order in LiMPO4(M=Ni, Co, Fe) and lithium diffusion in LiBaker1, Franke2, Pratt3 et al. 2011Phys. Rev. B446300View full textAdd to dashboardCite

“…This component disappears above 30 K and appears to be replaced by the strongly relaxing term that causes an increase in Λ. We attribute this behavior to a ∼ 10 % impurity phase that is most likely to be FePO 4 , since Li x FePO 4 is known to form an xLiFePO 4 :(1 − x)FePO 4 binary phase mixture 9 and T N (FePO 4 )≃ 25 K. 45 …”