Abstract
A new three-dimensional manganese(II) phosphate with one-dimensional channels, [NH4][Mn4(PO4)3], has been synthesized hydrothermally and characterized by single-crystal X-ray diffraction and magnetic measurements. The compound crystallizes in the orthorhombic space group Pnnm (No. 58) with a=9.8856(17), b=16.745(4), c=6.4639(9) Å; V=1070.0(3) Å3; Z=8. The anionic framework is formed by manganese phosphate layers (formed from MnO5 square-pyramids and PO4 tetrahedra), linked together by MnO5 and MnO6 polyhedra and PO4 tetrahedra. One-dimensional channels containing ammonium ions are formed along the crystallographic a-axis. The compound is closely related to a potassium-containing Mn(II) phosphate. Magnetic susceptibility measurements from room temperature to 2.5 K point to ferrimagnetic ordering at Tc∼17 K.
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