Tunable ferroelectric domain orientation in polycrystalline and highly oriented Na_0.5Bi_0.5TiO₃ Thin Films

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• 作者：Kumaraswamy Miriyala ; Ranjith Ramadurai ; ^{ranjith@iith.ac.in" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Pulsed laser ablation ; Thin films ; Lead free piezoelectrics ; PFM ; Ferroelectrics
• 刊名：Materials Letters
• 出版年：2016
• 出版时间：1 September 2016
• 年：2016
• 卷：178
• 期：Complete
• 页码：23-26
• 全文大小：2107 K

文摘

Sodium bismuth titanate (Na_0.5Bi_0.5TiO₃: NBT) has shown promising piezoelectric properties as an alternate to lead based piezoelectrics. NBT films with preferred crystalline orientation along <220> and polycrystalline features were fabricated on commercially available (111) Pt coated Si substrates by pulsed laser deposition (PLD). Ferroelectric domain patterns of NBT film with preferred orientation along <220> exhibited a variable in-plane piezoresponse in comparison to the out-of plane response. The presence of dominating planar components of the spontaneous polarization (P_s<111>) of NBT with rhombohedral structure could be responsible for the difference in planar response with respect to the sample alignment. In addition, a coherent interaction between polarization vectors across the grains was observed. However, the piezocoefficient (d₃₃) measurements show that the oriented as well as polycrystalline film exhibits similar piezoresponse with an average value of ~25 pm/V.