Paramagnetic absorption of pentavalent molybdenum in polycrystalline tin dioxide |
| |
Authors: | P. Meriaudeau M. Che A.J. Tench |
| |
Affiliation: | Institut de Recherches sur la Catalyse, C.N.R.S., 69626-Villeurbanne, France;Chemistry Division, A.E.R.E., Harwell, UK |
| |
Abstract: | Part of molybdenum introduced in SnO2 by various methods is found to be stabilized in the pentavalent state at substitutional positions. The ESR spectra of Mo5+ ions are characterized by the following parameters: gxx = 1.891; gyy = 1.835 and gzz = 1.923, Axx = 24 G, Ayy = 30 G and Azz = 70 G. There are, in addition, two sets of superhyperfine structures due to the two tins located along the crystallographic c axis (290 G) and to the four tins lying in a diagonal plane of the unit cell containing four oxygens (51 G), consistent with a 3dx2-y2 + λ 3dz2 ground state. The variations of the Mo5+ ESR spectrum upon heating the samples in various atmospheres (O2, H2) suggest that molybdenum enters the SnO2 lattice also as Mo4+. |
| |
Keywords: | To whom correspondence should be addressed |
本文献已被 ScienceDirect 等数据库收录! |
|