ChemInform Abstract: Synthesis and Characterization of Metal Tungstates by Novel Solid‐State Metathetic Approach.

Abstract

Tungsten I 5700 Synthesis and Characterization of Metal Tungstates by Novel Solid-State Metathetic Approach. -Scheelite-type MWO 4 (M: Ca, Sr, Ba) and wolframite-type ZnWO4 are synthesized by exposing mixtures of MCl2 (M: Ca, Sr, Ba, Zn) and Na2WO4 to microwave radiation at a frequency of 3.45 GHz and a power of 1100 W for 10 min. For the synthesis of MnWO4 and NiWO4 the microwave prepared product is heated at 500°C for 6 h. The samples are characterized by powder XRD, SEM, XPS, and diffuse reflectance spectroscopy. The new solid state metathetic method is very simple, cost--effective, easy to scale up, exhibits high yields, and thus has advantages over already known methods of synthesis. -(PARHI, P.; KARTHIK, T. N.; MANIVANNAN*, V.; J. Alloys Compd. 465 (2008) 1-2, 380-386; Dep. Mech. Eng., Colo. State Univ., Fort Collins, CO 80523, USA; Eng.) -W. Pewestorf 04-024