Structure evolution and piezoelectric properties of K0.40Na0.60Nb0.95Sb0.05O3–Bi0.5K0.5HfO3–SrZrO3 ternary lead-free ceramics with R–O–T phase boundary

Lanthanum‐Induced Morphotropic Phase Boundary in BiFeO3–BaTiO3‐Based Lead‐Free Piezoelectric Ceramics

“…These indicate that the relaxor behavior is enhanced. The enhanced relaxor behavior should be ascribed to the increased local composition fluctuation, [ 27–29 ] which is caused by the addition of La in this work. Nevertheless, the values of γ are all below 2 for these studied samples, and this means that all the studied ceramics are not yet typical relaxor ferroelectrics.…”

(Bi0.5Na0.5)(Zr0.97W0.01Fe0.02)O3 doping effects on KNN‐based lead‐free ceramics prepared via two‐step sintering technique

“…The phase structure of the KNN‐based materials is usually judged by the ratio of the intensity of the (002) and (200) XRD diffraction peak. When the ratio is 2:1, the phase structure is considered to be an orthorhombic phase (O phase, Amm2), and when the ratio is 1:2, it is considered to be a tetragonal phase (T phase, P4mm) 36,37 . From the magnified XRD patterns shown in Figure 1(A) (2θ = 44.5−46.5°), when x = 0.035 with small BiNZWF doping amount, the two diffraction peaks (002) and (200) are not sharp and significantly widened, and the (002) peak shows an obvious splitting around 2 θ of 45.7°.…”

“…When the ratio is 2:1, the phase structure is considered to be an orthorhombic phase (O phase, Amm2), and when the ratio is 1:2, it is considered to be a tetragonal phase (T phase, P4mm). 36,37 From the magnified XRD patterns shown in Figure 1(A) (2θ = 44.5−46.5 • ), when x = 0.035 with small BiNZWF doping amount, the two diffraction peaks (002) and (200) are not sharp and significantly widened, and the (002) peak shows an obvious splitting around 2θ of 45.7 • . With the increase of the BiNZWF doping amount, the diffraction peaks' widening changes, and the two diffraction peaks move to lower 2θ degree and get closer gradually.…”