Mechanism of Bi_0.5Na_0.5TiO₃ and Bi_4.5Na_0.5Ti₄O₁₅ template synthesis during topochemical microcrystal conversion and texturing of Bi_0.5(Na_0.8K_0.2)_0.5TiO₃ piezoelectric ceramics

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• 作者：Hyun Ae Cha ^{hacha@kims.re.kr" class="auth_mail" title="E-mail the corresponding author} ; Young-Kuk Kim ^{voice21@kims.re.kr" class="auth_mail" title="E-mail the corresponding author} ; Jae-Ho Jeon ; ^{jjh@kims.re.kr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Topochemical Microcrystal Conversion ; Bi0.5Na0.5TiO3 ; Bi4.5Na0.5Ti4O15 ; Bi0.5(Na0.8K0.2)0.5TiO3 ; Reactive-Templated Grain Growth
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：37
• 期：3
• 页码：967-974
• 全文大小：7143 K

文摘

The mechanism by which Bi_0.5Na_0.5TiO₃ and Bi_4.5Na_0.5Ti₄O₁₅ templates are synthesized via a topochemical microcrystal conversion method using Bi₄Ti₃O₁₂ precursor and TiO₂ particles was investigated based on their crystal structures. The Bi_0.5Na_0.5TiO₃ template consisted of a mixture of plate-like and equiaxed particles, whereas the Bi_4.5Na_0.5Ti₄O₁₅ template consisted only of plate-like particles. The size of the plate-like and equiaxed particles was dependent on the size of the Bi₄Ti₃O₁₂ precursor and TiO₂ particles, respectively. The Lotgering factor and piezoelectric constant of textured Bi_0.5(Na_0.8K_0.2)_0.5TiO₃ ceramics prepared using the Bi_0.5Na_0.5TiO₃ template were lower than those of the textured Bi_0.5(Na_0.8K_0.2)_0.5TiO₃ ceramics prepared from the Bi_4.5Na_0.5Ti₄O₁₅ template. This can be attributed to the small amount of plate-like particles in the Bi_0.5Na_0.5TiO₃ template caused by the inevitable co-existence of equiaxed particles.