Coherent Growth of α-Fe 2 O 3 in Ti and Nd Co-doped BiFeO 3 Thin Films
Coherent Growth of α-Fe 2 O 3 in Ti and Nd Co-doped BiFeO 3 Thin Films
复制标题
Ti和Nd共掺杂BiFeO 3 薄膜中α-Fe 2 O 3 的相干生长
DOI：
10.1080/21663831.2016.1160260
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发表时间：
2016
影响因子：
8.3
通讯作者：
Reaney, Ian M.
中科院分区：
文献类型：
--
作者：
Zhang, Huairuo;Marincel, Daniel M.;Trolier-McKinstry, Susan;Rainforth, W. Mark;Reaney, Ian M.
用脉冲激光沉积法在（Bi_（0.75）Nd_（0.25））（Fe_（0.97）Ti_（0.03））O_3（BNFO）外延膜表面生长了共格的树枝状α-Fe_2 O_3沉淀物。Fe 2 O3枝晶是由长度约为500 nm的纳米颗粒组成的集合体。 通过原子分辨扫描透射电子显微镜（SEM）观察到BNFO/α-Fe 2 O3界面处存在一个宽约102个晶胞的富Fe 2 O3的过渡区，具有钙钛矿结构。提出富Fe 2 O3钙钛矿结构的形成促进了α-Fe 2 O3的外延生长，而不是在BiFeO 3基薄膜中经常报道的非相干Fe 2 O3颗粒第二相的形成。影响声明新结构的发现可以解释在BiFeO 3基单相外延薄膜中观察到的异常高的铁磁响应，并将使材料科学界受益。
Coherent dendritic α-Fe2O3precipitates were observed to form at the surface of epitaxial films of (Bi0.75Nd0.25)(Fe0.97Ti0.03)O3(BNFO) grown by pulsed laser deposition. The Fe2O3dendrites are assemblages of nanosized particles with an approximate length of 500 nm. Through the use of atomic resolution scanning transmission electron microscopy, a transition zone at the BNFO/α-Fe2O3interface, ∼2 unit-cells wide, was observed to be Fe2O3-rich with the perovskite structure. It is proposed that the formation of the Fe2O3-rich perovskite structure encourages epitaxial growth of the α-Fe2O3rather than the formation of the incoherent Fe2O3particulate second phase frequently reported in BiFeO3-based thin films.Impact StatementThe discovery of the new structure may explain the abnormally high ferromagnetic response observed in the BiFeO3-based single-phase epitaxial films, and will benefit the communities of materials science.