We show that the application of a modest dc electrical field, about 4 V/cm, can significantly reduce grain growth in yttria‐stabilized polycrystalline zirconia. These measurements were made by annealing samples, for 10 h at 1300°C, with and without an electrical field. The finding adds a new dimension to the role of applied electrical fields in sintering and superplasticity, phenomena that are critical to the net‐shape processing of ceramics. Grain‐growth retardation will considerably enhance the rates of sintering and superplasticity, leading to significant energy efficiencies in the processing of ceramics.
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