The PDF file includes:

• Fig. S1. Parameters for sintering of TiO₂ and the microstructures of TiO₂ prepared by various sintering techniques.
• Fig. S2. True stress-strain curves and in situ movie snapshots of flash-sintered TiO₂ specimens tested at 200° and 600°C.
• Fig. S3. True stress-strain curves and corresponding in situ movie snapshots of zero-field sintered TiO₂ tested at RT and 400°C.
• Fig. S4. Examples of abundant preexisting dislocations and stacking faults in the flash-sintered TiO₂.
• Fig. S5. XPS profiles of the flash sintered TiO₂.
• Fig. S6. High-resolution STEM micrographs of twin boundaries and stacking faults in flash-sintered TiO₂ after compression at 400°C.
• Fig. S7. Stress-strain curves of flash-sintered TiO₂ obtained from in situ micropillar compression tests at different temperatures.
• Fig. S8. Bright-field TEM micrographs of a compressed conventional sintered TiO₂ pillar tested at RT.
• Supplementary Methods
• Legends for movies S1 to S8

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Other Supplementary Material for this manuscript includes the following:

• Movie S1 (.mp4 format). Micropillar compression of conventional sintered TiO₂ tested at RT.
• Movie S2 (.mov format). Micropillar compression of conventional sintered TiO₂ tested at 400°C.
• Movie S3 (.mov format). Micropillar compression of zero-field sintered TiO₂ tested at RT.
• Movie S4 (.mov format). Micropillar compression of zero-field sintered TiO₂ tested at 400°C.
• Movie S5 (.mov format). Micropillar compression of flash-sintered TiO₂ tested at RT.
• Movie S6 (.mov format). Micropillar compression of flash-sintered TiO₂ tested at 400°C.
• Movie S7 (.mov format). Micropillar compression of flash-sintered TiO₂ tested at 200°C.
• Movie S8 (.mov format). Micropillar compression of flash-sintered TiO₂ tested at 600°C.