High Temperature Gaseous Rare-Earth Permeation of Polyoxotungstates:An New Effective Method for the Preparation of Tungsten Bronzes
来源期刊：JOURNAL OF RARE EARTHS2004年第1期
论文作者：郭元茹 韦永德 李中华 周百斌
Key words：tungsten bronzes; high temperature; gaseous permeation; lanthanum; polyoxometalates; rare earths;
Abstract: New polyoxometalate α-K12H3[Y(BW11O39)2]·25H2O was synthesized and treated by high temperature gaseous rare earth permeation to prepare tungsten bronze K0.475WO3. XRD, TG-DTA, XPS, 183W-NMR,CV and AC impedance spectra were used to characterize the resulting material. The results of XPS indicate that La has permeated and diffused into the body of the sample and exists in the forms of binding with other components. The crystal structure parameters of K0.475WO3 were obtained by the analysis of XRD, which shows tetragonal crystal system with lattice parameters: a=12.28 nm, c=3.833 nm, V=578.48 nm-3. The conductivities calculated from the results of AC impedance spectra of the material increase with the increasing of temperature, which shows a semiconductor character.
郭元茹1，韦永德1，李中华1，周百斌1
(1.Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China)
Abstract:New polyoxometalate α-K12H3[Y(BW11O39)2]·25H2O was synthesized and treated by high temperature gaseous rare earth permeation to prepare tungsten bronze K0.475WO3. XRD, TG-DTA, XPS, 183W-NMR,CV and AC impedance spectra were used to characterize the resulting material. The results of XPS indicate that La has permeated and diffused into the body of the sample and exists in the forms of binding with other components. The crystal structure parameters of K0.475WO3 were obtained by the analysis of XRD, which shows tetragonal crystal system with lattice parameters: a=12.28 nm, c=3.833 nm, V=578.48 nm-3. The conductivities calculated from the results of AC impedance spectra of the material increase with the increasing of temperature, which shows a semiconductor character.
Key words:tungsten bronzes; high temperature; gaseous permeation; lanthanum; polyoxometalates; rare earths;
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