Fabrication of textured lead-free strontium barium niobate (SBN61) bulk ceramics and their electrical properties

详细信息    查看全文

• 作者：Sinan Dursun^a ; ^{sdursun@gtu.edu.tr" class="auth_mail" title="E-mail the corresponding author} ; Ebru Mensur-Alkoy^b ; Sedat Alkoy^a ; ^c
• 关键词：Templated grain growth ; Texture ; Molten salt synthesis ; Alginate gelation ; Tungsten bronze structure
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：36
• 期：10
• 页码：2479-2487
• 全文大小：2724 K

文摘

Sr_0.61Ba_0.39Nb₂O₆ (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.