Fabrication of textured Sr2Na0.9K0.1Nb5O15 ceramics: Anisotropy in structures and electrical properties

Progress on the fabrication of lead-free textured piezoelectric ceramics: perspectives over 25 years

“…Among many reasons for this, the reinforcement of texture degree is one of the most critical. As observed in Table 3 [91,103,104]. When the same template is used, a large property improvements for the piezoelectric ceramics can be attributed to the promotion of texture fraction and relative density such as textured Ba(Zr 0.2 Ti 0.8 )O 3 -(Ba 0.7 Ca 0.3 )TiO 3 ceramics using platelike BaTiO 3 as template [100,101].…”

“…Some examples are Sr x Ba 1-x Nb 2 O 6 , NaSr 2 Nb 5 O 15 , KSr 2 Nb 5 O 15 , etc. The development of textured Sr x Ba 1-x Nb 2 O 6 and NaSr 2 Nb 5 O 15 ceramics is limited due to shortcoming in the fabrication of same composition template particles through they have been prepared by the (R)TGG using needlelike KSr 2 Nb 5 O 15 particles as templates [90,91,103]. Recently, the needlelike NaSr 2 Nb 5 O 15 particles were synthesized by our group [59,60], which will be used as template to promote the development of textured NaSr 2 Nb 5 O 15 ceramics.…”

Preparation of cubic Na0.5Sr0.25NbO3 particles by molten salt synthesis

“…Alkali and alkalineearth niobates compounds are also known as lead-free functional materials due to a framework structure of NbO 6 octahedral [4][5][6][7][8]. Among lead-free functional ceramics families, strontium sodium niobates are of particular interest recently since they exhibit excellent dielectric, electrooptic, piezoelectric, ferroelectric and pyroelectric properties [9][10][11]. Calcium-modified strontium sodium niobates (Sr 2-x Ca x NaNb 5 O 15 , 0.05 B x B 0.35) are thought to be potential lead-free piezoelectric materials that exhibit a large piezoelectric constant of d 33 = 270 pC/ N [12].…”

“…Calcium-modified strontium sodium niobates (Sr 2-x Ca x NaNb 5 O 15 , 0.05 B x B 0.35) are thought to be potential lead-free piezoelectric materials that exhibit a large piezoelectric constant of d 33 = 270 pC/ N [12]. NaSr 2 Nb 5 O 15 -based textured ceramics is required to obtain higher electrical performance [9]. However, the NaSr 2 Nb 5 O 15 particles with anisotropic shape as templates were difficult to fabricate, which limited to the development of textured NaSr 2 Nb 5 O 15 ceramics.…”

“…Up to now, a lot of work has been carried out on NaSr 2 Nb 5 O 15 ceramics [9][10][11][13][14][15][16][17], few research was reported on the investigation of Na 0.5 Sr 0.25 NbO 3 ceramics. Na 0.5 Sr 0.25 NbO 3 lead-free ceramics had no received considerable attention, which were only detected as second phase [18,19].…”