Abstract
Solid state reaction synthesis was employed for the production of triclinic zinc molybdate (α-ZnMoO4) crystal. X-ray diffraction (XRD) pattern, Rietveld refinement analysis, Fourier-transform infrared (FT-IR) and Fourier-transform Raman (FT-Raman) spectroscopy confirmed that α-ZnMoO4 exhibit a triclinic structure without evidence of any impurity phase. FT-IR spectroscopy gives information about vibrational features of Mo–O in the [MoO4] clusters. The 13 active vibrational modes were observed in Raman spectra from 100 to 1000 cm−1. UV–Vis absorption spectroscopy was used for calculation of optical band gap. The band gap (Eg) of 4.12 eV was observed for a direct allowed transition. The photoluminescence (PL) spectrum of α-ZnMoO4 gives intense green emission. Microwave dielectric constant (εr), temperature coefficient at the resonant frequency (τf) and Q x f value were measured by Hakki-Coleman method and found to be 8.05, −121.81 ppm/oC and 48320 GHz respectively. These results suggested the applications of ZnMoO4 in LEDs, scintillating detectors and microwave device.
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