Structure and electrical properties of (Li, Sr, Sb)-modified K0.5Na0.5NbO3 lead-free piezoelectric ceramics

Phase structures and electrical properties of (1−x)(K0.48Na0.52)NbO3–x(Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 lead-free ceramics

“…The reduced bulk density which increases the leakage current diminishing the polarization in process should be the main reason for the decrease the piezoelectric properties. On the other hand, sample of x ¼ 0.05 and 0.06 are near the tetragonal side of the orthorhombictetragonal phase boundary, while sample of x ¼ 0.04 was near the orthorhombic side of the orthorhombictetragonal phase boundary, and thus more possible polarization stated there, resulting in higher piezoelectric parameters [14]. Fig.…”

Dielectric and piezoelectric properties of K0.47Na0.47Li0.06NbO3 doped with BaCO3 and SrCO3

“…The electromechanical coupling factor (kp) was determined by the resonance and anti-resonance method according to the IEEE standards by an impedance analyzer (HP 4294A). The polarization-electric field (P-E) hysteresis loop measurements were performed on The ceramics with x = 0.6% can be determined as the mixed phases with tetragonal and orthorhombic symmetry [13]. However, it is difficult to determine accurately the crystal structure of the ceramics with x = 0.5%.…”

“…On the other hand, the rapid development of optical and piezoelectric application urgently calls for environment-friendly materials substituting for lead-based systems [2,3]. Currently, leadfree piezoelectric materials that have been intensively studied including Bi 0.5 Na 0.5 TiO 3 -based materials [4][5][6], bi-layered structure materials [7][8][9], tungsten bronze-type materials [10] and alkaline niobate-based materials [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Phase structure, microstructure and piezoelectric properties of perovskite (K0.5Na0.5)0.95Li0.05NbO3–Bi0.5(K0.15Na0.85)0.5TiO3 lead-free ceramics

“…(K 0.5 Na 0.5 )NbO 3 (KNN) is the most investigated lead-free piezoelectric system over the past 5 years [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. It is because that KNN is considered as the most promising candidate for lead-based piezoelectric ceramics following the work of Saito et al [3].…”