Electron backscatter diffraction analysis of Pb(Mg1/3Nb2/3)O-3-35mo% PbTiO3 single crystals grown by seeded polycrystal conversion

Electron backscatter diffraction (EBSD) has been applied to characterize Pb (Mg1/3Nb2/3)O-3-35 mol%PbTiO3 single crystals grown by the seeded polycryst al conversion method. Macroscopically triangular crystal growth fronts were shown to each be associated with discrete crystals that originated from sl ightly misoriented segments of an initially cracked single-crystal seed pla te. Various types of crystal imperfections, including voids, second-phase r egions, and polycrystalline matrix grains trapped within the grown region, were readily identified and distinguished from one another using EBSD. Furt her, it was shown that trapped matrix grains in the grown region had consis tently small misorientations with respect to the grown single crystal and t his may be qualitatively explained by a simple boundary energetics argument . The significance of the trapped grains is discussed.