Investigation of the dielectric and piezoelectric properties of potassium sodium niobate ceramics close to the phase boundary at (K0.35Na0.65)NbO3 and partial substitutions with lithium and antimony

Abstract

Abstract

Crystal structure and properties of K0.5Na0.5NbO3–Bi0.5Na0.5TiO3–LiSbO3 lead-free piezoelectric ceramics

“…This is consistent with the bulk density trend of the ceramics, which reaches the maximum value of 4.2 g/cm 3 when x = 5 mol%. However, when the LiSbO 3 content is ≥5 mol%, the electrical conductivity of the ceramics increases with increasing LiSbO 3 , resulting in high leakage current [14]. As a result, the dissipation factor of KNN-BNT-LS100x ceramics increases obviously with increasing LiSbO 3 when x ≥ 5 mol%.…”

“…However, the pure KNN is difficult to process into dense ceramics using conventional sintering methods because of the high volatility of alkaline elements at elevated temperatures [3,4]. In order to obtain well-sintered and dense KNN ceramics with good electrical performance, various ABO 3 -type compounds have been added into KNN to form KNN-based solid solutions, such as KNN-BaTiO 3 [5], KNN-SrTiO 3 [6], KNN-Bi(Zn 0.5 Ti 0.5 )O 3 [7], KNN-LiTaO 3 [8], KNN-LiNbO 3 [9], KNN-BiAlO 3 [10], KNN-LiSbO 3 [11][12][13][14], KNN-(Bi 0.5 Na 0.5 )TiO 3 [15] and KNN-(Bi 0. 5 Li 0.5 )TiO 3 [16].…”

Structural phase transitions and electrical properties of (K Na1−)NbO3-based ceramics modified with Mn

“…When used in their optimum amounts to dope KNN ceramics, Sb, 3 Li, 4,5 Ta 6 alone or in combination [7][8][9][10][11] have all been reported to improve the piezoelectric properties. * Corresponding author.…”

Influence of Yttrium Dopant on the Structure and Electrical Conductivity of Potassium Sodium Niobate Thin Films

“…In that respect, potassium sodium niobate (K 0.5 Na 0.5 NbO 3 or KNN) has been considered as one of the ceramic materials for new lead-free piezoelectric. It exhibits high Curie temperature (420 ͦ C), high dielectric constant (~700), high remanent polarization (14μC/cm 2 ), low coercive field (~140kV/cm) and high piezoelectric constant (~300 pC/N) [3][4][5] . However, the fact that KNN is comprised of ABO 3 , a perovskite structure that was discovered in the 1950s was ignored through the years due to the difficulties encountered with KNN processing.…”