Crystal Growth and Structure of the New Ferrimagnetic Oxyphosphate PbFe3O(PO4)3

A new oxyphosphate, PbFe3O(PO4)3, has been discovered and its structure has been characterized by single‐crystal XRD between 293 and 973 K (monoclinic, space groupP21/m, a = 7.5826 Å, b = 6.3759 Å, c = 10.4245 Å, β = 99.956°, Z = 2, at r.t.). Direct‐current (DC) magnetic susceptibility and specific heat measurements performed on single crystals revealed an unusual sequence of second‐order ferromagnetic‐like phase transitions at Tc1 = 31.8 K, Tc2 = 23.4 K and Tc3 ≈ 10 K. Alternating‐current (AC) magnetic susceptibility measurements suggest glass‐like dynamics between ca. 20 K and Tc3. A new oxyphosphate, PbFe3O(PO4)3, has been discovered and its structure has been characterized by single‐crystal XRD. Direct‐current (DC) magnetic susceptibility and specific heat measurements performed on single crystals revealed an unusual sequence of second‐order ferromagnetic‐like phase transitions. Alternating‐current (AC) magnetic susceptibility measurements suggest glass‐like dynamics.