Abstract
Excess surface charges corresponding to either Ni 3+ or Cr 6+ ions were estimated for calcined pure and doped nickel and chromium oxides. Mutual doping was effected in the range 0.5%–10%. The extent of surface nonstoichometry is correlated with pertinent phase modifications on calcining the doped (or mixed) oxide. Nitrogen sorption isotherms were analysed for texture assessment. The presence of Ni 3+ and/or Cr 6+ ions leads to narrow pore narrowing even to the extent of blockage, depending on the surface concentration.
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