Structure and Properties of Multiferroic Oxygen Hyperstoichiometric BiFe1−xMnxO3+δ

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• 作者：Sverre M. Selbach ; Thomas Tybell ; Mari-Ann Einarsrud ; Tor Grande
• 刊名：Chemistry of Materials
• 出版年：2009
• 出版时间：November 10, 2009
• 年：2009
• 卷：21
• 期：21
• 页码：5176-5186
• 全文大小：1076K
• 年卷期：v.21,no.21(November 10, 2009)
• ISSN：1520-5002

文摘

The structure and properties of materials in the BiFeO₃-rich side of the pseudo-binary phase diagram BiFeO₃−BiMnO₃ are reported. Manganese substitution (x) and oxygen hyperstoichiometry (δ) are demonstrated to strongly affect the crystallographic properties, electrical conductivity, and phase-transition temperatures of BiFe_1−xMn_xO_3+δ. Increasing the manganese content and oxygen hyperstoichiometry of the materials depresses the Nel temperature, the ferroelectric Curie temperature, and the transition temperature from the paraelectric, ferroelastic structure to the paraelastic, cubic perovskite structure. The thermodynamics of the ambient pressure solid solubility is discussed and a phase diagram for the system BiFe_1−xMn_xO_3+δ is presented, establishing the stability regions of three, two, one, and zero simultaneous ferroic properties. Finally, technological implications of the influence of manganese and excess oxygen are discussed.