Pb(Mg_(1/3)Nb_(2/3))O_3- Pb(Ni_(1/3)Nb_(2/3))O_3-PbTiO_3 Crystals by Solid State Growth

摘要

A small piece of <110> orientated relaxor-based ferroelectric Pb(Mg_(1/3)Nb_(2/3))O_(3-)PbTiO_3 (PMN-PT) single crystals was embedded in Pb(Mg_(1/3)Nb_(2/3)O_3-Pb(Ni_(1/3)wNb_(2/3)O_3PbTiO_3(PMN-PNN-PT) polycrystalline matrix to form the fully dense disk by spark plasma sintering (SPS) technique. Specimens were subsequently annealed to promote the boundary migration of the template single-crystal through a process termed as solid-state single crystal growth. It was found that the addition of excess 5 wt% PbO can promote the crystal growth, and the 2D morphology with V-shaped single crystals of PMN-PNN-PT were also observed. The possible growth mechanism was discussed.