Fabrication of textured lead-free strontium barium niobate (SBN61) bulk ceramics and their electrical properties
Journal of the European Ceramic Society, cilt.36, sa.10, ss.2479-2487, 2016 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 36 Sayı: 10
- Basım Tarihi: 2016
- Doi Numarası: 10.1016/j.jeurceramsoc.2016.03.014
- Dergi Adı: Journal of the European Ceramic Society
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.2479-2487
- Anahtar Kelimeler: Alginate gelation, Molten salt synthesis, Templated grain growth, Texture, Tungsten bronze structure
- Maltepe Üniversitesi Adresli: Evet
Özet
Sr0.61Ba0.39Nb2O6 (SBN61) ceramic fibers with a high [001] texture were fabricated by a combination of alginate gelation method and templated grain growth process using acicular Ba2NaNb5O15 (BNN) template particles. The rod-like BNN template particles were prepared by molten salt synthesis method with salt/powder ratio of 2 giving the highest aspect ratio. Fibers were drawn from alginate based slurries without or with 10 wt% BNN template particles. Increasing sintering temperature and time were found to increase the texture. Textured SBN61 bulk ceramics with dimensions in cm scale were fabricated by wet packing a limited number of grain oriented green fibers and sintering the green bulk to obtain a dense, textured bulk ceramic through templated grain growth. A maximum texture fraction, f, of 0.91 was obtained, as measured by Lotgering factor. Increased remnant polarization and electromechanical properties were obtained as a result of this preferred grain orientation.