Transition-metal inorganic salts such as Ag2CrO4 have been extensively studied for its application in lithium-ion batteries and in the pigment industry [1]. Ag2CrO4 which crystallizes in the Pnma space group (with a = 10.063 Å, b = 7.029 Å and c = 5.540 Å) [2] is very appealing because of its unique electronic and optical properties [3]. For the first time, silver chromate polycrystalline sample has been synthesized by a facile one-step reaction between Ag2O and CrO3 under mild hydrothermal conditions. The final Ag2CrO4 compound was characterized by X-ray powder diffraction (XRD), scanning electron microscope (SEM) coupled with energy dispersive X-ray spectroscopy (EDX), UV-visible diffuse reflectance spectroscopy (UV-visible DRS) and Fourier transform infrared spectroscopy (FT-IR). The asprepared Ag2CrO4 compound crystallizes in an orthorhombic structure with space group Pnma. SEM images show that the grain size varies from 20 to 25 μm. Optical characterization reveals sharp absorption band in the visible region with absorption maxima located at 500 nm. The optical band gap calculated in the visible range is 1.69 eV. FT-IR study shows the existence of the vibrational peak of Cr-O appearing at 837 cm-1.FigureFig. 1. (a)Room temperature X-ray Rietveld refinement of the Ag2CrO4 product (b) UV-visible absorbance spectrum of Ag2CrO4. Inset of (b) Band gap of Ag2CrO4 calculated from the diffuse reflectance spectrum. [1] A Fujishima , K Honda . Nature 238(1972) 37-38. [2] M.L. Hackert, R.A. Jacobson. Journal of Solid State Chemistry 3(1971) 364-368. [3] S. Ouyang, Z. Li, Z. Ouyang, T. Yu, J. Ye, Z. Zou. Journal of Physical Chemistry C 112(2008) 3134-3141.