Energy-efficient mechanochemical synthesis of MgWO4 phase materials: (micro)-structural, thermal, and optical properties

Abstract

We prepared MgWO 4 phase materials by energy-efficient mechanochemical approach without post-annealing treatments which differ from the existing studies concerning the phase formation, thermal, optical, and morphological features. The as-milled powder reveals monoclinic structure with the lattice parameters, a = 0.4683( 5) nm, b = 0.5686(6), c = 0.4956(6) nm, and β = 90.73°. The TGA curve shows the weight loss of 4.7% for the as-milled powder. The IR bands at 513 and 570 cm -1 indicate the Mg-O vibration mode, whereas the IR bands seen at 794 and 825 cm -1 are assigned to W-O vibration mode for the MgWO 4 phase materials. The NIR reflectance of the MgWO 4 phase analysis achieved in the present work is novel in comparison to the existing studies which reveals the maximum reflectance of ~35% in the solar NIR pigmentation region. The as-milled powder MgWO 4 has the E g direct of 3.97 eV. Agglomerated particles of MgWO 4 phases are observed in the SEM images.