Abstract
A new member of (A,M)2P2O7 diphosphate family, MgNiP2O7, has been synthesized and structurally characterized. The structure was determined using powder X-ray diffraction. MgNiP2O7 crystallizes in the monoclinic system, space group P21/c, with the unit cell parameters a= 6.4903(3) Å; b= 8.2772(3) Å; c=9.0131(4) Å and β= 113.767(9) °, Z=4 and V= 473.867(3) Å3. The structure of MgNiP2O7 is isotypic with β-Mg2P2O7 and α-Ni2P2O7. The Mg and Ni atoms are distributed randomly between MO5 pyramid and MO6 octahedron. The infrared and Raman vibrational spectra have been investigated and all the modes have been attributed. CIE L* a* b* parameters values are determined and UV-Visible spectrum consists of weak and narrow band between 680 and 720 nm assigned to the forbidden d-d transition of Ni2+ ions due to the square pyramid environment of Ni2+ in MgNiP2O7 which is in a good agreement with the structure refinement results.
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