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Basal dislocations in nanolaminated machinable ternary carbides and nitrides (also known as MAX phases) have been postulated to be the result of shearing M−A bonds, but have not been microscopically confirmed yet. This study on dislocations and stacking faults in C-vacancy-ordered Nb12Al3C8 demonstrates that the basal dislocation core lies between NbC slabs, verifying the shear of Nb−Al bonds. The...
Dense (1−x)BiScO3–xPbTiO3 nanoceramics with morphotropic phase boundaries and an average grain size of 11nm were prepared. Synchrotron X-ray diffraction studies revealed that tetragonal and monoclinic phases coexist, and the grain boundary regions could be modeled as a paraelectric cubic phase. The grain boundary regions possessed complicated stress and electric fields. The polarization switching...
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