Paramagnetic absorption of pentavalent molybdenum in polycrystalline tin dioxide

  • Meriaudeau P
  • Che M
  • Tench A
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Part of molybdenum introduced in SnO2by 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 SnO2lattice also as Mo4+. © 1975.

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  • P. Meriaudeau

  • M. Che

  • A. J. Tench

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