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

The manganese end member of triplite-triploidite series of compounds, Mn2(PO4)OH, is synthesized by a hydrothermal method. Its crystal structure is refined in the space group P21/c with a = 12.411(1) Å, b = 13.323(1) Å, c = 10.014(1) Å, β = 108.16(1), V = 1573.3 Å3, Z = 8, and R = 0.0375. Evidenced in measurements of magnetization M and specific heat Cp, Mn2(PO4)OH reaches a long range antiferromagnetic order at TN = 4.6 K. As opposed to both triplite Mn2(PO4)F and triploidite-type Co2(PO4)F, the title compound is magnetically frustrated being characterized by the ratio of Curie-Weiss temperature Θ to Néel temperature TN of about 20. The large value of frustration strength |Θ|/TN 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.

[1]  Yong Baek Kim,et al.  Phenomenological approach to a hyperkagome spin liquid: Emergent gauge fields and spinons , 2016 .

[2]  S. Feng,et al.  Structure, optical spectroscopy properties and thermochromism of Sm3Fe5O12 garnets , 2016 .

[3]  K. Knight,et al.  Orbital frustration in the S = ½ kagome magnet vesignieite, BaCu3V2O8(OH)2 , 2016 .

[4]  T. Saha‐Dasgupta,et al.  Structure-Property Relationships in α-, β'-, and γ-Modifications of Mn3(PO4)2. , 2016, Inorganic chemistry.

[5]  J. Mi,et al.  Perfect Kagomé lattices in YCu3(OH)6Cl3: a new candidate for the quantum spin liquid state , 2016 .

[6]  G. Sheldrick.  Crystal structure refinement with SHELXL , 2015, Acta crystallographica. Section C, Structural chemistry.

[7]  G. Sheldrick.  SHELXT – Integrated space-group and crystal-structure determination , 2015, Acta crystallographica. Section A, Foundations and advances.

[8]  T. Armbruster,et al.  The triplite–triploidite supergroup: structural modulation in wagnerite, discreditation of magniotriplite, and the new mineral hydroxylwagnerite , 2014 .

[9]  T. Armbruster,et al.  Superspace description of wagnerite-group minerals (Mg,Fe,Mn)2(PO4)(F,OH) , 2014, Acta crystallographica Section B, Structural science, crystal engineering and materials.

[10]  J. Goodenough,et al.  Statics and dynamics of the highly correlated spin ice Ho 2 Ge 2 O 7 , 2012, 1603.06319.

[11]  Louis J. Farrugia,et al.  WinGX and ORTEP for Windows: an update , 2012 .

[12]  T. Rojo,et al.  A new partially deprotonated mixed-valence manganese(II,III) hydroxide-arsenate with electronic conductivity: magnetic properties of high- and room-temperature sarkinite. , 2012, Inorganic chemistry.

[13]  Bella Lake,et al.  Spin and orbital order in the vanadium spinel MgV 2 O 4 , 2010, 1009.0429.

[14]  R. Cava,et al.  Magnetic properties of the garnet and glass forms of Mn_{3}Al_{2}Si_{3}O_{12} , 2009, 0909.4720.

[15]  T. Rojo,et al.  Fe2(AsO4)F: A new three-dimensional condensed fluoro-arsenate iron(II) compound with antiferromagnetic interactions , 2006 .

[16]  M. Gingras,et al.  Spin Hamiltonian, competing small energy scales, and incommensurate long-range order in the highly frustrated Gd(3)Ga(5)O(12) garnet antiferromagnet. , 2005, Physical review letters.

[17]  M. Gingras,et al.  Spin Ice State in Frustrated Magnetic Pyrochlore Materials , 2001, Science.

[18]  E. Nickel,et al.  Strunz mineralogical tables: Chemical-structural mineral classification system , 2001 .

[19]  M. Leblanc,et al.  The magnetic structures of Mn2PO4F and Co2PO4F at 1.2 K , 1997 .

[20]  Arthur P. Ramirez,et al.  Strongly Geometrically Frustrated Magnets , 1994 .

[21]  T. Armbruster,et al.  Single-crystal X-ray structure study of synthetic pyrope almandine garnets at 100 and 293 K , 1992 .

[22]  I. D. Brown,et al.  Bond‐valence parameters obtained from a systematic analysis of the Inorganic Crystal Structure Database , 1985 .

[23]  I. D. Brown,et al.  On the geometry of O–H⋯O hydrogen bonds , 1976 .

[24]  I. Brown,et al.  Empirical bond-strength–bond-length curves for oxides , 1973 .

[25]  John B. Goodenough,et al.  Magnetism and the chemical bond , 1963 .