title: Structural and diffuse reflectance study of Ca(1-x)Co(x)MO4 (M=W, Mo).
abstract: Precipitation and combustion routes have been followed in the synthesis of Co substituted scheelite phases of the formula Ca1-xCoxMO4 (M=W, Mo). Phase analysis by powder XRD techniques indicated that precipitation method resulted in pure tetragonal scheelite phase formation in the case of compositions Ca1-xCoxMO4 (x=0.1, 0.2, 0.3) and Ca1-xCoxMO4 (x=0.1, 0.2, 0.5). While in combustion method, pure tetragonal structure phase was obtained only for the composition with x=0.1 in both the cases. As evidenced from the SEM analysis that the precipitation method lead to the formation of microballs and the combustion route yielded powder of dispersed particles in the case of Ca0.9Co0.1WO4 and Ca0.9Co0.1MoO4. Similarly, the method of synthesis influenced the color of the above two phases. The colorimetric data revealed the difference in the color hues of the phases with increase in cobalt content in both W and Mo series.
authors: Materials Chemistry Division, School of Advanced Sciences, VIT University, Vellore - 632 014, Tamil Nadu, India. Electronic address: gopalbhu@yahoo.com.
authors: G
authors: G
authors: Buvaneswari
authors: Materials Chemistry Division, School of Advanced Sciences, VIT University, Vellore - 632 014, Tamil Nadu, India.
authors: Keerthi
authors: K
authors: Valsalan
mesh_terms: D011232:Chemical Precipitation; D003116:Color; D003460:Crystallization; D055620:Optical Phenomena; D010087:Oxides / Q000737:chemistry*; D011208:Powders; D013056:Spectrophotometry, Ultraviolet; D014961:X-Ray Diffraction
chemical_list: D010087:Oxides; D011208:Powders
keywords: Combustion; Diffuse reflectance; Oxides; SEM analysis; Scheelite; X-ray diffraction