Texture Development in KSr₂Nb₅O₁₅ Ceramics Fabricated by Reactive Templated Grain Growth

Abstract

Highly textured KSr 2 Nb 5 O 15 ceramics (~ 94%) were reactively sintered in a matrix of SrNb 2 O 6 and KNbO 3 powders. Acicular KSr 2 Nb 5 O 15 template particles (10 wt%) were used to texture the samples in [001]. Excess Nb 2 O 5 , added as a liquid former, facilitated preferential growth of template particles at the expense of matrix grains, resulting in improved f with sintering conditions.

Recent progress on piezoelectric energy harvesting: structures and materials

“…Texture ceramics with grain oriented growth has achieved much attention, as its extraordinarily high piezoelectric response can reach in 60-80% of the same component single crystal; the results indicate that texturing is a meaningful method to improve the ferroelectric and piezoelectric performance. KSr 2 Nb 5 O 15 [80] −15 m 2 /N), which was three times larger than the value of piezoelectric ceramics with grain growth randomly. High d 33 × g 33 coefficient is mainly due to the growth orientation of textured piezoelectric ceramic with suppressing ε from template BaTiO 3 , which opens new area for choosing a lower ε to template materials to strengthen transduction coefficient.…”

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

“…11. Thus, the highly textured KSr 2 Nb 5 O 15 ceramics (*0.94) were reported by Yurdal et al [89] in spite of the first fabrication. A high quality of texture (0.98) was achieved to optimize the content of excess Nb 2 O 5 and template particles by Duran [129], whose piezoelectric coefficient d 33 is 65 pC/N [104].…”

Processing and Properties of Textured Potassium Strontium Niobate (KSr2Nb5O15) Ceramic Fibers – Texture Development

“…Our two previous studies on KSN were conducted to determine the fabrication conditions of highly [001] textured bulk KSN ceramics prepared by a combination of tape casting and reactive TGG methods, and to investigate the structure‐property relationships in these materials. Our previous studies on fibers were focused on developing a new technique to draw ceramic fibers, to study PZT‐based piezoelectric ceramic fibers in particular and to prepare 1‐3 piezocomposites from these PZT fibers .…”

“…Potassium strontium niobate – KSN [KSr 2 Nb 5 O 15 ] was selected as a prototypical lead‐free piezoelectric material in our study to prove the concept of processing a crystallographically textured piezoelectric ceramic fiber. This selection was based on several parameters, namely; KSN being a unipolar ferroelectric with spontaneous polarization only along the c ‐axis [001] and generally displaying large properties along this polar axis, therefore, allowing the possibility to obtain fiber texture; availability of KSN template particles in the form of needles; and our previous experience in texturing KSN through tape casting and reactive TGG methods …”