Enhanced dielectric temperature stability and energy-storage properties of (Y0.5Nb0.5)4+ co-doped (Bi0.5Na0.5)0.94Ba0.06TiO3 lead-free relaxor ceramics

Enhanced energy storage properties of KNbO3 modified (Bi0.5Na0.5)TiO3–BaTiO3 based lead-free relaxor ferroelectric ceramics

“…8(a) shows the unipolar P – E loops of BNBTYN-100 x KN ceramics tested at 1 Hz and BDS. The parameters of energy storage performance are calculated by the following equation: 37 The energy storage parameters of BNBTYN-100 x KN ceramics under BDS are presented in Fig. 8(b).…”

High energy storage performance of lead‐free Nb‐modified (Bi0.2Na0.2Ca0.2Ba0.2Sr0.2)TiO3 high‐entropy ceramics

“…19 In another way, for perovskite structure, the partial substitution of Ti 4+ by high valence Nb 5+ ion at the B site contributes to lessening the reduction Ti 4+ to Ti 3+ and restraining the migration of oxygen vacancies, which will promote resistivity and reduce leakage current, thus enhancing the electric breakdown strength. [20][21][22] For instance, He et al introduced Nb 5+ into 0.54Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 -0.4Bi 0.2 Sr 0.7 TiO 3 and found that Nb doping could limit the generation of oxygen vacancy and raise the dielectric resistivity, thus resulting in a high E b (190 kV/cm) and good energy storage performance (W rec = 2.07 J/cm 3 , η = 94.5%). 20 Wang et al discovered that Y and Nb-modified (Bi 0.5 Na 0.5 ) 0.94 Ba 0.06 TiO 3 ceramics presented reduced oxygen vacancies and dielectric loss, leading to a high E b (115 kV/cm) and W rec (0.91 J/cm 3 ).…”

“…doped Nb into (Na 0.5 Bi 0.5 ) 0.75 Sr 0.25 TiO 3 and as the doping amount of Nb increased, the average grain size decreased from 2.91 (2% Nb) to 2.25 µm (5% Nb), obtaining the improvement of electrical breakdown strength 19 . In another way, for perovskite structure, the partial substitution of Ti 4+ by high valence Nb 5+ ion at the B site contributes to lessening the reduction Ti 4+ to Ti 3+ and restraining the migration of oxygen vacancies, which will promote resistivity and reduce leakage current, thus enhancing the electric breakdown strength 20–22 . For instance, He et al.…”

“…Wang et al. discovered that Y and Nb‐modified (Bi 0.5 Na 0.5 ) 0.94 Ba 0.06 TiO 3 ceramics presented reduced oxygen vacancies and dielectric loss, leading to a high E b (115 kV/cm) and W rec (0.91 J/cm 3 ) 21 . Jiang et al.…”

Structure and Dielectric Behavior of Yb2O3-MgO Co-Doped 0.92BaTiO3-0.08(Na0.5Bi0.5)TiO3 Ferroelectric Relaxor

“…Thus, in order to obtain a flat ε r -T curve for applications, the control of core-shell microstructure in BaTiO 3 -based dielectric ceramic is an effective way [11,14,15]. (Na 0.5 Bi 0.5 )TiO 3 (NBT for short) with a perovskite structure is one of the most important ferroelectric material, which shows a high Curie temperature T c ~593 K. NBT is widely used for the modification of BT ceramics in recent researches to move the T c to a high temperature and obtain a broad ε r -T curve [14][15][16][17][18][19]. However, the ε r -T curve of BT-NBT still shows significant peak behavior in our experience, which make it not suitable in applications.…”