Residual stress measurements in polycrystalline graphite with micro-Raman spectroscopy

Data related to the mesoscopic structure of iso-graphite for nuclear applications

“…1 (c), are present in region B. These inclusions have the characteristic structure of the quinoline-insoluble (QI) particles, as reported by other researchers [2] , [3] , [4] , [5] , [6] , [7] . They exist fairly extensively inside binding carbon, which is derived from coal tar pitch, but rarely inside the petroleum-derived coke.…”

An understanding of lattice strain, defects and disorder in nuclear graphite

“…Raman peak profile analysis was used to calculate the characteristic crystallite size [22], compressive residual stress [19] and dislocation density [39] across sub-surface regions of the graphite samples. Further details on the models used in these calculations can be found elsewhere [19,22,39,40]. The crystallite size was determined based on the integrated area ratio between the D and G peak intensities, termed I D and I G respectively, using the following equation:…”

“…In this respect, other more powerful experimental techniques that can be used to investigate the microstructural parameters are X-ray diffractometry and Raman spectroscopy, both of which provide data that can be analysed to obtain microstructural information of materials. Both the techniques are well established, non-destructive, have a practical significance and provide information on the bulk properties of polycrystalline materials averaged over the whole sample volume (~1 μm below the top layer) [19,20]. Only a handful of literature is available that focuses on characterising the change in crystal dimensions and lattice parameters from the diffraction and spectroscopic data obtained via XRD and Raman spectroscopy, respectively [10,11,12,13,14,21].…”

Novel combustion synthesis of carbon foam‑aluminum fluoride nanocomposite materials

“…the Ferrari correlation graphs, significant compressive strain of the materials also has to be accounted for[47].…”