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Corkite, PbFe3(PO4)(SO4)(OH)6, an understudied relative of the jarositefamily of Heisenberg antiferromagnets, has been synthesized and its magneticproperties characterized for the first time. Relative to natural samples,synthetic corkite displays signatures in both infrared and Raman spectra of amore ordered arrangement of polyanion groups about the kagom\'e sublattice thatretains inversion symmetry. Magnetic susceptibility measurements reveal thatdried corkite undergoes a transition to a long-range,antiferromagnetically-ordered state below TN = 48 K, lower than that observedin the majority of jarosite phases, and indicative of further spin frustration.Curie-Weiss fitting of the measured magnetic susceptibility yields an effectivemagnetic moment of peff = 6.29(1) muB/Fe^3+ and theta_CW = -526.0(1.1) K,analogous to that observed in similar high-spin Fe^3+ systems, and indicativeof strong antiferromagnetic coupling. Estimation of the change in magneticentropy as a function of temperature from T = 0 K to T = 195 K, dS_mag = 14.86J/mol_Fe^3+ K, is also in good agreement with the dS_mag = Rln(2S+1) = 14.9J/mol K expected for a S = 5/2 system. In comparison to the pure jarosites,where both structure and magnetism remain largely invariant upon a variety ofchemical substitutions, the replacement of one sulfate group per formula unitwith a higher-valent phosphate group applies additional steric and electronicpressure on the kagom\'e lattice in corkite, further frustrating the magneticground state of the material. Corkite thus represents both an outlier in theknown body of jarosite-type materials, and an illustration of how existingstructures may be further strained in the development of highly frustratedmagnetic systems.

Hydrothermal synthesis of ordered corkite, PbFe3(PO4)(SO4)(OH)6, a S = 5/2 kagom\'e antiferromagnet