A mixed cation nickel diphosphate with a layered intergrowth structure: synthesis, structural and magnetic characterization of Na(NH4)[Ni3(P2O7)2(H2O)2]

Add time:09/08/2019    Source:sciencedirect.com

A nickel diphosphate with mixed cations, Na(NH4)[Ni3(P2O7)2(H2O)2] with a layered structure has been synthesized under hydrothermal conditions for the first time and characterized by single crystal X-ray diffraction, IR spectroscope and magnetization measurements. The structure consists of cis- and trans-edge sharing NiO6 octahedral chains linked via P2O7 units to [Ni3P4O16]2− layers. The ammonium and sodium cations are alternately located in the interlayer spaces. The mixed cations play an important role in the structural formation of this layered compound, leading to a new layer-stacking variant. The magnetic susceptibility obeys a Curie–Weiss law with μeff of 3.32 μB, showing the Ni2+ character and weak antiferromagnetic interactions.

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