Fig. 1 TEM image of the initial commercial silicon nitride powder
O. A. Lukianova, V. V. Krasilnikov, A. A. Parkhomenko, V. V. Sirota
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O. A. Lukianova et. al. "Microstructure and Phase Composition of Cold Isostatically Pressed and Pressureless Sintered Silicon Nitride", Nanoscale Research Letters <a rel="nofollow" class="external text" href="https://doi.org/10.1186/s11671-016-1365-1">doi:10.1186/s11671-016-1365-1</a>