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SnO 2 –NiO and SnO 2 –CoO powders mixed in a molar ratio of 92: 8 were reactively sintered for up to 200 h at 1400 °C to form composites having NiO and Co 2 SnO 4  particles embedded in Ni- and Co-doped SnO 2  grains, respectively. Analytical electron microscopic observations indicated the embedded particles remained nonepitaxial with respect to the host grains despite prolonged holding at a high homologous temperature, owing to a rather limited solid solubility and vague interfacial energy cusp. Upon cooling or solution annealing at 900 °C, the Niand Co-doped SnO 2  formed {100}, {110}, {101} and/or (001)-specific Guinier–Preston zone plates and dislocations. The formation of additional commensurate superstructure in Ni- but not Co-doped SnO 2  indicated a coupled atom clustering and ordering process for the former during solution annealing.

Phase behavior of Ni- and Co-doped SnO 2 via reactive sintering and solution annealing