Towards novel functional properties by interface reaction in mixtures of BaTiO₃-Fe₂O₃ composite ceramics

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• 作者：Oana Condurache^a ; Ina Turcan^a ; Lavinia Curecheriu^a ; ^{lavinia.curecheriu@uaic.ro" class="auth_mail" title="E-mail the corresponding author} ; Cristina Ciomaga^a ; Petronel Postolache^b ; Gabriela Ciobanu^a ; Liliana Mitoseriu^a ; ^{lmtsr@uaic.ro" class="auth_mail" title="E-mail the corresponding author}
• 关键词：BaTiO3 based composite ceramics ; Magnetic properties ; Dielectric properties ; Dc-tunability
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：1098-1105
• 全文大小：1551 K

文摘

In the present work, composite ceramics of ferroelectric BaTiO₃ with magnetic αFe₂O₃ were prepared by mixing powders in different ratio. The M(H) loops at room temperature show a “wasp-waisted” character, with multiple components, determined as result of the formation of magnetic phases with contrasting coercivities (hard BaFe₁₂O₁₉ and soft Ba₁₂Ti₂₈Fe₁₅O₈₄ phases) in different ratios, according to the X-ray diffraction patterns. The extrinsic contributions play important roles in modifying the electrical properties in the ceramics with large amount of magnetic phases, causing space charge effect and Maxwell-Wagner relaxations. The high field properties of composite ceramics show non-hysteretic nonlinearity for all investigated ceramics, together with a reduction of zero field permittivity with increasing magnetic amount, making from these composites possible tunable materials interesting for applications.