Electric-field-induced phase transition and large strain in lead-free Nb-doped BNKT-BST ceramics

Electrical properties and low temperature sintering of BiAlO3 doped (Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 lead-free piezoelectric ceramics

“…The changing of the lattice parameter in BCZT ceramics with increasing of BAO content confirms the discussion above. Similar effects have also been reported for other dopants, such as Nb 2 O 5 and MnO 2 [19,20]. Figure 2 displays the surface images and the relative density of (1 -x)BCZT-xBAO ceramics sintered at 1300°C with x = 0.0, 0.3, 0.8, 1.0 and 1.5 mol%.…”

Effect of different templates on structure evolution and large strain response under a low electric field in <00l>-textured lead-free BNT-based piezoelectric ceramics

“…The synthesis mechanism of grain-oriented BNT-BT lead-free piezoelectric ceramics was investigated and the result revealed that the driving force for the growth of textured grain derives from the difference in surface energy along with the chemical potential gradient between the stable template and the metastable liquid phase, which was confirmed by transmission electron microscope (TEM) and piezoresponse force microscopic (PFM) observations [5,18]. To investigate the effect of different template particles on the crystal symmetry, the diffraction peak profiles in the range of 45 • -47.5 • were fitted using Lorentzian shape functions [19], as shown in Fig. 2(b).…”

“…3(a). The decrease in P r with the addition of template particles was attributed to the growth of polar nano-regions(PNRS),which originates from compositional disorder at the expense of long-range polar order [19,23]. The shape of polarization hysteresis loops clearly demonstrated that the ferroelectric order is disturbed with the addition of template particles, leaving a "weak" ferroelectric phase with a very small non-cubic distortion or a "non-polar" phase at zero electric field that transforms reversibly into a ferroelectric phase by an applied field [24][25][26].…”

Microstructure, electrical properties of Bi2NiMnO6-doped 0.935(Bi1/2Na1/2) TiO3–0.065BaTiO3 lead-free piezoelectric ceramics

“…Moreover, the emergence of oxygen vacancies is highly dependent on the site occupation of the doping cations in the perovskite structure. Thus, it is thought that the remarkable acceleration of grain growth at a high doping level may be an indicator for the B-site occupation of the Ni 2+ and Mn 4+ cations [25]; however, excess BNMO doping restrain grain growth, excess BNMO can concentrate near grain boundaries and decrease their mobility substantially. Thus, the mass transportation is weakened and grain growth is inhibited [26].…”