Original Reaction Sequence of Pb(Yb_1/2Nb_1/2)O₃-PbTiO₃: Consequences on Dielectric Properties and Chemical Order

Figure 1

X-ray diagram of PYN-PT powder (for ) obtained by various techniques: at 950°C by solid-state reaction of PbO + TiO₂ + YbNbO₄ (a) for 7 h and (b) for shorter calcination time (4 h) revealing the presence of PYN and PT and (c) by solid-state reaction of Pb(Yb_1/2Nb_1/2)O₃ + PbTiO₃ leading to PYN-PT after 4 h. Pure PYN-PT can be synthesized by solid-state reaction at 800°C for 12 h (d) as well as by mechanosynthesis (e) of PbO + TiO₂ + YbNbO₄.