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The effect of field assisted sintering (FAS) on the compaction of TiN ceramics is examined using a nanosized TiN powder. Microstructural evolution at different stages of FAS is evaluated using electron microscopy. Coarse spherical particles (1-5 μm) are found at 700°C. These particles apparently result from excessive heat release on interparticle contacts when an electrical current passes through agglomerates at certain stages. The specific surface area and pore size distribution in sintered samples are examined with static volumetric absorption. The compaction and microstructural evolution are discussed in terms of electric field effects.