Incorporation of nitrogen into the fluorite structure of ceria occurs by treatment in ammonia between 550 and 900 °C, with maximum uptake of 4.5 mol % N at temperatures close to 700 °C and with reduction to Ce3+ above 650 °C, leading to the solid solution Ce4+1−yCe3+yO2–(3x/2)−(y/2)NxV(x+y)/2 with x ≤ 0.09 and y ≤ 0.03.
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Sobrido et al. (2008) studied this question.
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