(K,Na)NbO₃-based piezoelectric single crystals: Growth methods, properties, and applications

Abstract

Abstract

Dielectric, ferroelectric, and piezoelectric properties of Gd-modified CaBi2Nb2O9 high Curie temperature ceramics

“…These piezoelectric sensors usually withstand high temperature of 500 °C or higher. To meet the requirements of these applications, piezoelectric materials must possess high piezoelectric performance and high electrical resistivity as well as high Curie temperature [1][2][3][4][5][6][7][8][9][10][11][12].…”

Influence of Quenching and Subsequent Annealing on the Conductivity and Electromechanical Properties of Na1/2Bi1/2TiO3-BaTiO3

“…The impending regulation that revived the interest on lead-free piezoelectric alternatives [ 1 ] identified four major families of materials based on BaTiO 3 [ 2 ], Na 1/2 Bi 1/2 TiO 3 [ 3 ], K 0.5 Na 0.5 NbO 3 [ 4 ] and BiFeO 3 [ 5 , 6 ]. Amongst these, Na 1/2 Bi 1/2 TiO 3 -based compositions are versatile and when appropriately modified, demonstrate potential use in (a) solid oxide fuel cells (high ionic conductivity) [ 7 ] and (b) high temperature capacitors [ 8 ] and high-power ultrasonics [ 9 , 10 ] (insulating character with high mechanical quality factor).…”

Optimizing K0.5Na0.5NbO3 Single Crystal by Engineering Piezoelectric Anisotropy

“…As a promising alternative to lead zirconate titanate (PZT), the K 0.5 Na 0.5 NbO 3 , a leadfree ferroelectric material, has exhibited outstanding piezoelectric performance near the polymorphic phase boundary (PPB) [7] and attracted massive attention worldwide in recent years due to its environmental friendliness [8][9][10][11][12][13]. Owing to its unique merits of a high piezoelectric coefficient (d 33 ), excellent ferroelectric properties, and a high Curie temperature (Tc = 420 • C), KNN has been widely utilized in energy-harvesting devices, transducers, actuators, and sensors [14][15][16][17][18][19][20][21]. Although pristine KNN ceramics possess relatively low piezoelectricity (d 33~8 0 pC/N), they can be remarkably improved by tuning sintering conditions [22], domain engineering [23], phase boundary engineering [24,25], texturing [26], and so on.…”