溶胶-凝胶-水热法低温合成掺钛铁酸铋晶体(英文)

Low-temperature Preparation of Neodymium-doped BiFeO_3 Crystallites by a Sol-Gel-Hydrothermal Method

采用新颖的溶胶-凝胶-水热法合成了多铁性Bi1-xNdxFeO3（BNFO,x=00.35）粉体。结果发现,在x≤0.25时能合成单相的Bi1-xNdxFeO3晶体,而合适浓度的KOH和NaOH分别有利于合成纯的Bi1-xNdxFeO3和Bi2Fe4O9晶体。扫描电镜结果表明BNFO晶体呈球形,其尺寸对KOH的浓度很敏感。BNFO晶体的铁电居里温度随着Nd掺杂的增加而向低温移动。磁性能测试结果表明,随着Nd掺杂量的增加,样品的磁性能得到增强。此外,还讨论Bi1-xNdxFeO3晶体的形成机制。

Multiterroic Bi_(1-x)Nd_xFeO_3(BNFO,x=0~0.35) powders were synthesized by a novei sol-gel-hydrothermal route.It was found that pure Bi_(1-x)Nd_xFeO_3 crystallites could be obtained for x≤0.25,and the appropriate concentration of KOH and NaOH were benefit to growing pure Bi_(1-x)Nd_xFeO_3 and Bi_2Fe_4O_9 crystallites respectively.Scanning electron microscopy observation revealed that spherical morphology of BNFO crystallites were formed,and the size was sensitive to the concentration of KOH.The ferroelectric Curie temperatures of BNFO crystallites were shifted to a lower temperature with Nd substitution.The result of magnetic test revealed that the magnetic moments of the samples were improved by increasing Nd content in the BNFO.The formation mechanism of the Bi_(1-x)Nd_xFeO_3 crystallites was also discussed.