Fabrication of c-axis-oriented potassium strontium niobate (KSr2Nb5O15) ceramics by a rotating magnetic field and electrical property

Abstract

Fabrication and property of c-axis-oriented KSr 2 Nb 5 O 15 (KSN) ceramics were examined. Particle-oriented KSN was fabricated by using a rotating magnetic field and subsequent sintering. KSN fine powder was prepared by conventional solid-state reaction and grinding processing. C-axis-oriented KSN green compact was fabricated in a rotating magnetic field 10 Tesla. The resulting green body was sintered at 1473 K for 6 h and then at 1525 K for 2 h to prevent exaggerated grain growth. C-axis-oriented KSN ceramics with relative density 92% was obtained. In XRD, peaks from the c-planes, such as 001 and 002, were very strong at the horizontal cross section of the sintered specimens. The ferroelectric and piezoelectric property along to c-axis was also improved to 21 µC/cm 2 and d 33 = 101 pC/N by orientation structure.

Processing and properties of textured potassium strontium niobate (KSr2Nb5O15) ceramic fibers-effect of texture on the electrical properties

“…a d 33 coefficient of 65 pc/n was measured for the bulk Ksn with f (00l) = 0.91. In another study in the literature, Tanaka et al [31] reported a d 33 coefficient of 101 pc/n for Ksn textured through the application of strong magnetic field (10 T) with f (00l) = 0.99. The d 33 coefficient for single-crystal Ksn was reported as 95 pc/n [32].…”

Investigation of anisotropic mechanical properties of textured KSr2Nb5O15 ceramics via ab‐initio calculation and nanoindentation

“…18 Textured KSN ceramics with grains grown along the [001] direction as a preferred orientation can be fabricated via reactive template grain growth (RTGG) methods. 19 Recently, Tanaka et al 20 reported the fabrication of c-axis-oriented KSN ceramics (relative density of 85% in the sintered ceramics) using a rotating strong magnetic field. The microstructural, electrical, and fabrication properties of textured KSN ceramics have been extensively investigated, but studies on their mechanical properties are lacking.…”

Механические напряжения и гигантский пьезоотклик поверхности текстурированной керамики K-=SUB=-2-=/SUB=-Sr-=SUB=-4-=/SUB=-Nb-=SUB=-10-=/SUB=-O-=SUB=-30-=/SUB=-

“…Одноосные сегнетоэлектрики со структурой тетрагональной вольфрамовой бронзы (ТВБ) являются перспективной основой для бессвинцовых активных материалов нового поколения [1,2]. Технология горячего прессования (ГП) позволяет эффективно создавать в них аксиальную текстуру с преимущественной ориентацией осей c игольчатых кристаллитов перпендикулярно оси давления [3,4].…”