Fig. 4.

XRD-crystallite sizes (triangles) and BET-equivalent particle diameters (circles) as a function of acetylene flow rate through the FASP ring at HAN = 1 cm. Small (open triangles) and large (filled triangles) crystallite sizes were fitted to the XRD spectra along with the mass fraction of the latter (squares). The Goodness of Fit (GOF, bottom diagram) is lower for the two-mode fit at low C₂H₂ flow rates indicating a better match to the spectra. For C₂H₂ flow rates > 2 L/min, the spectra are well described by a single crystallite mode indicating a more uniform product. Then, the two crystallite sizes converge toward a single one