Abstract
Pure and 2 mol% Sm 2O 3-doped ZrO 2 nanopowders were synthesized via the precipitation method. The very lower activation energy (∼25.979 kJ/mol) related to the bulk counterpart is observed for the grain growth within the calcination temperature range of 600–1000 °C. Experimental results show that two factors were contributed to the lower activation energy of grain growth. Firstly, the introduction of oxygen vacancies in nano-2SmSZ grain surface reduces the activation energy of the formation of necks between grains. Secondly, the rotation process between coherent grains has very lower activation energy or even a zero-kinetic barrier.
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