Structural, ferroelectric and magnetic properties of BiFeO₃ synthesized by sonochemically assisted hydrothermal and hydro-evaporation chemical methods

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• 作者：Danijela Luković Golić^a ; ^{danijela@imsi.bg.ac.rs" class="auth_mail" title="E-mail the corresponding author} ; ^{danijeluk@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Aleksandar Radojković^a ; Jovana Ćirković^a ; Aleksandra Dapčević^b ; Damir Pajić^c ; Nikola Tasić^a ; Slavica M. Savić^a ; Milica Počuča-Ne&scaron ; ić^a ; Smilja Marković^d ; Goran Branković^a ; Zorica Marinković Stanojević^a ; Zorica Branković^a
• 关键词：BiFeO3 ; Sintering conditions ; Lattice distortion ; Ferroelectric properties ; Magnetic properties
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：36
• 期：7
• 页码：1623-1631
• 全文大小：2307 K

文摘

BiFeO₃ powders were synthesized by sonochemically assisted hydrothermal and hydro-evaporation methods. The X-ray diffraction confirmed the presence of secondary phases, Bi₂₅FeO₃₉ and Bi₂Fe₄O₉, in as prepared BiFeO₃ powders. Optimization of sintering conditions indicated that temperature of 800 °C and time of 2 h after pressing at 9 t/cm² provided ceramics samples with the highest density (up to 96% of theoretical density) and the lowest content of secondary phases. Ferroelectric and magnetic characterization was performed on two selected ceramics samples with the highest densities. Ceramics obtained from the powder synthesized by the hydrothermal method showed greater lattice distortion along [1 1 1] axis and smaller grains, which resulted in larger values of electric polarization at room temperature. It also exhibited less Fe(3d)–O(2p) orbital overlapping due to a larger FeOFe bond angle, causing lower antiferromagnetic ordering and weak ferromagnetic behavior at low temperatures.