High temperature ligand field spectra in spinels: Cation disorder and cation kinetics in NiAl₂O₄

Abstract

Abstract Results are reported of optical transmission experiments on the spinel NiAl 2 O 4 that have been made at temperatures up to 1400°C. The spectra are discussed, and analyzed in relation to the temperature dependence of the distribution of cations on the two cation sublattices. The kinetics of cation sublattice exchange is studied by means of temperature jump experiments performed under in‐situ conditions in the temperature range between 600°C and 700°C.