Coordination of V 4+ in vanadium titanium oxide xerogels

Abstract

V 2 - y Ti y O 5 - δ • nH 2O (0 < y < 1.33, layered structure) and Ti 1 - y V y O 2 + δ • nH 2O (0 < y < 0.25, anatase structure) solid solutions are synthesized by a sol-gel process. ESR spectra are used to assess the state of tetravalent vanadium in the solid solutions before and after calcination at 350°C and after intercalation with K +. Six types of ESR signals arising from paramagnetic ions in different environments are identified. Computer simulation is used to evaluate the ESR parameters of the materials studied. © 2005 Pleiades Publishing, Inc.