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Flash sintering has proven to be a novel and cost-efficient technique that enables the successful processing of dissimilar materials. The present work investigated how sintering under electric field input progresses in commercial anatase (A) plus rutile (B) polymorphs containing titania. Both the phase evolution and sintering dynamics were highly dependent on the strength of the field, the application of which led to (A + R) → R → flash at low fields while promoting (A + R) → flash at high fields. A temperature postponement of flash was verified at low fields, as the event was preceded by the A → R transformation, which was responsible for a detectable peak in the thermal spectra of the current. The processing temperature, applied electric field (E), and onset flash sintering temperature (
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