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The manganese end member of triplite-triploidite series of compounds, Mn 2 (PO 4 )OH, is synthesized by a hydrothermal method. Its crystal structure is refined in the space group P2 1 /c with a = 12.411(1) Å, b = 13.323(1) Å, c = 10.014(1) Å, β = 108.16(1), V = 1573.3 Å 3 , Z = 8, and R = 0.0375. Evidenced in measurements of magnetization M and specific heat C p , Mn 2 (PO 4 )OH reaches a long range antiferromagnetic order at T N = 4.6 K. As opposed to both triplite Mn 2 (PO 4 )F and triploidite-type Co 2 (PO 4 )F, the title compound is magnetically frustrated being characterized by the ratio of Curie-Weiss temperature Θ to Néel temperature T N of about 20. The large value of frustration strength |Θ|/T N stems from the twisted saw tooth chain geometry of corner sharing triangles of Mn polyhedra, which may be isolated within tubular fragments of a triploidite crystal structure.

Magnetically frustrated synthetic end member Mn2(PO4)OH in the triplite–triploidite family

Magnetically frustrated synthetic end member Mn₂(PO₄)OH in the triplite–triploidite family