Effect of Molybdenum and Vanadium Substitution in Langbeinite Phosphates: Structural and Thermal Expansion Investigation of KPbCr2P3-xMxO12 (M = V, Mo and x = 0.1, 0.2)
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This research work reports synthesis, characterization and thermal expansion investigation of vanadium and molybdenum substituted langbeinite phosphates with the chemical formula KPbCr 2 P 2.9 V 0.1 O 12 , KPbCr 2 P 2.8 V 0.2 O 12 and KPbCr 2 [P 2.9 Mo 0.1 ] +0.1 O 12 , KPbCr 2 [P 2.8 Mo 0.2 ] +0.2 O 12 . All the four-materials exhibit phase pure cubic structure with P2 1 3 space group. Rietveld refinement studies authenticate the single-phase formation with the least chi square values. The lattice parameters and lattice volume increased upon the substitution of bigger of VO 4 and MoO 4 for smaller PO 4 group in the framework. The morphological and elemental mapping investigation reveal the crystalline nature of materials, shape of the particles and distribution of the elements. The peak shift and peak broadness in the vibrational modes of FTIR spectra affirms that the VO 4 and MoO 4 tetrahedral groups have effectively been substituted for the PO 4 tetrahedra. The average coefficient of thermal expansion of KPbCr 2 [P 2.8 Mo 0.2 ] +0.2 O 12 and KPbCr 2 P 2.8 V 0.2 O 12 is found to be 1.04 x 10 − 6 / K and 1.44 x 10 − 6 / K.
