Excellent piezo-/pyro-/ferroelectric performance of Na 0.47 K 0.47 Li 0.06 NbO 3 lead-free ceramic near polymorphic phase transition

Electrocaloric effect and pyroelectric performance in (K,Na)NbO3‐based lead‐free ceramics

“…The highest value of p is 454.46 × 10 -4 C m -2 K -1 at T C in x = 0.03. This large p is much higher than the reported results in KNN-based ceramics, 30,52,53 which can be even comparable to that of lead-free or lead-based ceramics. 28,[54][55][56][57] The p value of other components at T C is 166.51 × 10 -4 , 49.67 × 10 -4 and 9.2 × 10 -4 C m -2 K -1 for x = 0.04, 0.05 and 0.06, respectively.…”

“…Therefore, a great amount of attention has been given to the ECE induced by phase transition within different ferroelectric phases recently. [28][29][30] Hence, it is also of equal significance to develop the lead-free pyroelectric materials in order to meet requirement of application. The similar phase transition between different ferroelectric phases is also obtained in (Ba 0.87 Ca 0.13 )(Ti 0.87 Hf 0.13 )O 3 ceramic as reported by Zhao et al, 8 achieving a ΔT of 0.47 K at 60°C.…”

“…27 At present, pyroelectric materials are popular in numerous applications like thermal imaging, radiometers, infrared sensors, pollution monitor, fire alarms, and intruder alarms. [28][29][30] Hence, it is also of equal significance to develop the lead-free pyroelectric materials in order to meet requirement of application. The KNN-based materials as an excellent piezoelectric material should also possess high pyroelectric property because all the piezoelectric materials are necessarily pyroelectric in nature.…”

Synthesis of 0.64Pb(Mg1/3Nb2/3)O3–0.36PbTiO3 ceramic near morphotropic phase boundary for high performance piezoelectric, ferroelectric and pyroelectric applications

“…A ferroelectric material with minimum polarization degradation over a number of applied switching cycles is required for long-term operations [35]. Therefore, the fatigue test is important to study the aging effect in a ferroelectric material.…”

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

“…; but it contains more than 60 wt% lead oxide [3,4]. 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].…”