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

摘要

Fabrication and property of c-axis-oriented KSr₂Nb₅O₁₅ (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/cm2 and d₃₃ = 101 pC/N by orientation structure.