A new (1 − x)Pb(Lu1/2Nb1/2)O3–xPbTiO3 binary ferroelectric crystal system with high Curie temperature

Super-Lattice Structure and Phase Evolution of Pb(Lu0.5Nb0.5)O3-PbTiO3 Single Crystal with Low PbTiO3

“…The starting chemicals, PbO (99.9%), TiO 2 (99.9%), Lu 2 O 3 (99.99%), Nb 2 O 5 (99.9%), and H 3 BO 3 (99.9%), were weighed according to the formula (1−x)PLN-xPT (x = 0.2). The detailed growth process and the proper flux-to-solute molar ratio were described in an earlier paper of PLN-PT crystals growth [13][14][15]. Finally, the single crystal has been obtained as shown in Figure 1.…”

“…Compared with the typical Pb(Zr 1−x Ti x )O 3 system, the PZT with low PT content (x < 0.05) are AFEs at room temperature, AFE-FE phase-transition regions exist, and the Curie temperature is between that of the PZ and PT content [16]. Therefore, we think there would be another line missing in the (1−x)PLN-xPT phase diagram [13]. The existence of such a region requires more detailed targeting investigations, which are also a direction of our follow-up work, and we are in the process of studying it, including in this work.…”

“…However, it was found that the symmetry of the relaxors ferroelectric (FE) PLN-0.2PT and AFE PLN were orthorhombic [15]. The phase diagram of the PLN-PT binary system was previously reported based on XRD and dielectric measurements results [13]. Unusually, some peculiarities of the PLN-0.07PT system have been observed, such as that the Curie temperature of PLN-PT with low PT obtained from the phase diagram is much lower than that of PLN and PT end members.…”

“…The high Curie temperature and good piezoelectric properties of the PLN-PT system imply that a PLN-PT single crystal can be a promising good piezoelectric material; therefore, a series of PLN-PT binary ferroelectric (FE) crystals has been successfully obtained by a top-seed solution growth technique in our lab. The crystals reveal an MPB (x = 0.49 − 0.51) and the composition x = 0.49 shows a high Curie temperature (T c = 360 • C) and high piezoelectric properties (d 33 = 1630 pC/N) [13][14][15].…”

“…Unusually, some peculiarities of the PLN-0.07PT system have been observed, such as that the Curie temperature of PLN-PT with low PT obtained from the phase diagram is much lower than that of PLN and PT end members. It is observed that in x = 0.1 and 0.2 of (1−x)PLN-xPT ceramics [11] and 0 < x < 0.33 of (1−x)PLN-xPT crystals [13] the temperature of the dielectric anomaly deviates from the ideal linear relationship between 240 • C (PLN) and 490 • C (PT). Compared with the typical Pb(Zr 1−x Ti x )O 3 system, the PZT with low PT content (x < 0.05) are AFEs at room temperature, AFE-FE phase-transition regions exist, and the Curie temperature is between that of the PZ and PT content [16].…”