Ferroelectric properties of magnetoelectric CoFe₂O₄/Bi_3.15Nd_0.85Ti₃O₁₂ composite ceramics with coherent-lattice interfaces

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• 作者：Hongjun Zhang^a ; Hua Ke^a ; ^{hua_ke@hit.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Liwei Zhang^a ; Wen Wang^a ; Dechang Jia^a ; Peng Miao^b ; Yu Zhou^a
• 关键词：Magnetoelectric ; Embedding structure ; Coherent-lattice interface ; Raman ; HRTEM
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：127
• 期：Complete
• 页码：29-32
• 全文大小：990 K

文摘

The CoFe₂O₄(CFO)/Bi_3.15Nd_0.85Ti₃O₁₂(BNdT) composite ceramics with coherent-lattice interfaces were prepared to keep good ferroelectricity. The coherent-lattice interfaces exhibit (020)_BNdT//(130)_CFO orientation, as a result of a very small lattice mismatch. Raman spectra indicate symmetry breaking of CFO phase with the forbidden A_1g mode (~ 684 cm^− 1) leading to new modes around 727 and 734 cm^− 1, suggesting that coherent interfaces have superlattice-like characteristics. The electric breakdown field increases to 400 kV/cm for the 30 mol% CFO ceramic comparing with 250 kV/cm for the pure BNdT. Partly enhanced ferroelectric polarization, as measured by hysteresis loops, is observed likely helped by this superlattice-like bonding.