Electromechanical and electrical properties of Bi0.5Na0.5Ti1−xMnxO3−δ ceramics with high remnant polarization

Microstructures and energy storage properties of Mn-doped 0.97Bi0.47Na0.47Ba0.06TiO3–0.03K0.5Na0.5NbO3 lead-free antiferroelectric ceramics

“…The P-E measurements for the samples were conducted in silicon oil as the testing media to prevent arcing. Oxygen vacancies are favorable to the mass transport during sintering and can greatly promote the grain growth [14,15]. It was also reported [16,17] that when Mn element is added to PZT-based ceramics, without exceeding the solubility limit, Mn ions homogeneously dissolve into the lattice of the perovskite structure, improve the grain growth of the materials.…”

Enhanced dielectric and piezoelectric properties of Ta-doped 0.50(Na0.5Bi0.5)TiO3–0.50(K0.5Bi0.5)TiO3 lead-free ferroelectric ceramics

“…Increase in grain size may be attributed to the Ta substituting Ti at B-site. The replacement of Ti-ions by Ta-ions will generate the oxygen vacancies which may favor the mass transport during sintering and thus greatly promote grain growth upto 0.4 wt% of Tadoped BNKT [7]. But with further doping, Ta may be segregating at the grain boundaries and thus limiting the grain growth.…”

“…It was found that the conductivity of all samples increases with the increase in temperature, which indicates the semiconducting character of the material. The curve was fitted with the Arrhenius equation for conduction given by [23,7] …”

“…On the other hand, alkali-based titanates and niobates are promising candidates for lead-free materials as they offer strong piezoelectric and ferroelectric properties [5,6]. Sodium bismuth titanate (Na 0.5 Bi 0.5 )TiO 3 (NBT) is one of the excellent ferroelectric materials with a high Curie temperature T c =320 1C, large remnant polarization P r =38 mC/cm 2 and a coercive field E c =73 kV/cm at room temperature [7,8]. Thus NBT is a promising candidate for lead-free piezoelectric material and work on various dopants with improved electrical response is reported.…”

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

“…Nickel and manganese are often used as dopant to improve the electrical properties for electrical ceramics [13][14][15]. Besides, the compound of Bi 2 NiMnO 6 (abbreviated as BNMO) has been of interest due to its double-perovskite structure with monoclinic symmetry and multiferroic materials [16,17], and it was assumed that the piezoelectric and ferroelectric properties of BNT-BT6.5 ceramics could be improved by BNMO doping.…”