【摘要】 采用水热合成法,通过调整PVA的加入量实现了对合成铁酸铋的相变和形貌的控制,用X射线衍射仪（XRD）和扫描电镜（SEM）对样品进行了表征。结果表叫,少量PVA的加入会使得铁酸铋产物中Bi/Fe的摩尔比降低,但是,更多PVA的加入将使产物中Bi/Fe的摩尔比升高。加入PVA的量（16 g/L）从0 mL增大到5 mL时,对应形成的相为BiFeO₃和Bi₂Fe₄O₉,当PVA的加入量增大到10 mL和15 mL时,得到的相是Bi₂₅FeO₄₀或Bi₄₆Fe₂O₇₂。相应的,反应产物的形貌演变从块状集合中空结构和纳米片混合→纳米片→纳米片和束状结构混合→束状结构。对PVA的加入如何影响产物的相的机制进行了简单讨论。更多还原

【Abstract】 The effects of PVA adding amount on the phase formation and morphology evolution of the bismuth ferrite by a hydrothermal synthesis route were investigated.The products were characterized by X-ray diffraction（XRD）,and scanning electron microscope（SEM）.The result indicates that a little PVA addition makes the mole ratio of Bi/Fe in the formed bismuth ferrite decrease.However,more amount of PVA addition leads to the mole ratio of Bi/Fe increase.With the amounts of PVA increasing from 0 mL to 5 mL,the phase of the synthesized samples changes from BiFeO₃ to Bi₂Fe₄O₉ When the amount of PVA added increases to 10 and 15 mL,Bi₂₅FeO₄₀ or Bi₄₆Fe₂O₇₂ are obtained.Correspondingly,the morphology of the synthesized particles evolves from the mixture of bulk-particle assembled hollow-piles and nanoflakes to nanoflakes,the mixture of nanoflakes and bundles,and mainly bundles,respectively.The mechanism of the effect of PVA adding on the phase formation was simply discussed.更多还原