Abstract
Diffuse reflectance spectra at room temperature have been collected on polycrystalline perovskite (CaTiO 3), zirconolite (CaZrTi 2O 7) and thorutite (ThTi 2O 6) samples doped with Np. The Np species give rise to a number of broad, unresolved intraconfigurational f– f electronic transition bands in the near-infrared and visible spectral regions. Both Np 3+ and Np 4+ can substitute in the Ca site of perovskite by the appropriate choice of charge compensation and sintering atmosphere. No detectable spectral differences were observed when Np 4+ was targeted towards either the Ca or Zr sites in zirconolite. Np 4+ but not Np 5+ can be incorporated in the Th site of thorutite by sintering in air. Even in the most dilute [≤ 0.03 formula units (f.u.)] Np 4+ samples of the different titanates studied, there was only very approximate agreement with the Kubelka–Munk law.
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