Figure 1: Electron microscope characterization of as-synthesized n-B4C.
From: Enhanced mechanical properties of nanocrystalline boron carbide by nanoporosity and interface phases
(a) The SEM micrograph of as-sintered n-B4C with nanograins ranging from 40 to 150 nm. Scale bar, 100 nm. (b) TEM image of as-synthesized n-B4C. Fine pores with sizes of ~20–70 nm evenly distribute in the sample and the mean size is of ~32(±7) nm determined by an image tool analyser. Scale bar, 200 nm. (c) HRTEM image of an amorphous carbon layer between two B4C nanograins. Scale bar, 5 nm. The insert is the fast Fourier transform pattern taken from the amorphous GB phase. (d) HREM image of a clean B4C grain boundary without a detectable GB phase. Scale bar, 10 nm.
