The fitted PDFs reveal that increasing the pyrolysis temperature leads to enhanced local ordering within the graphitic layers. This is evident from the decrease in interlayer spacing and increase in coherence length of the graphitic domains. The observed increase in U33 with higher temperatures is attributed to a wider distribution of d002 spacings, which is correlated with a wider distribution of nanopores. These results are consistent with observations reported for other HC materials. Table . HC microstructure parameters, including the in-plane lattice parameter (a), the interlayer spacing between graphene sheets (d002), the average coherence length of graphitic domains (Lc), the in-plane anisotropic displacement parameter (U11), and the out-of-plane anisotropic displacement parameter (U33).