Cr doping-induced structural phase transition, optical tuning and magnetic enhancement in BiFeO3 thin films
Cr doping-induced structural phase transition, optical tuning and magnetic enhancement in BiFeO3 thin films
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BiFeO3 薄膜中 Cr 掺杂引起的结构相变、光学调谐和磁增强
DOI：
10.1016/j.matlet.2016.09.094
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发表时间：
2017-01-01
影响因子：
3
通讯作者：
Chu, Junhao
中科院分区：
文献类型：
--
作者：
Guo, Benlong;Deng, Hongmei;Chu, Junhao
采用溶胶-凝胶法在石英衬底上制备了BiFe_（1-x）Cr_xO_3（xBFCO，x=0，0.03，0.06和0.09）多晶薄膜。X射线衍射结果表明，xBFCO薄膜的晶体结构由菱方晶向正交晶转变，晶面间距和晶粒尺寸略有减小。扫描电子显微镜表明，Cr掺杂可以改善薄膜的表面形貌，降低薄膜的平均晶粒尺寸。室温下xBFCO薄膜的光致发光（PL）谱显示出较强的蓝光发射。随着x从0.00增加到0.09，xBFCO薄膜的带隙（E-g）减小，可用E-g=（2.58-0.67x）eV表示。与BiFeO 3薄膜相比，xBFCO（x=0.03，0.06和0.09）薄膜的饱和磁化强度显著提高，在信息存储方面具有潜在的应用前景。
BiFe1-xCrxO3 (xBFCO, x=0, 0.03, 0.06 and 0.09) polycrystalline films have been prepared on quartz substrates by a sol gel technique. X-ray diffraction clearly reveals the crystal structure of xBFCO thin films transforms from rhombohedral to orthorhombic, moreover, inter planar spacing and grain size of xBFCO are reduced slightly. Scanning electron microscopy shows that Cr doping can improve surface morphology and reduces the average grain size of the films. The photoluminescence (PL) spectra of xBFCO thin films at room temperature show a strong emission in the blue region. With increasing x from 0.00 to 0.09, the band gap (E-g) of xBFCO films decreases and can be expressed by E-g=(2.58-0.67x)eV. Compared with BiFeO3 film, the saturation magnetization of xBFCO (x=0.03, 0.06 and 0.09) films is significantly enhanced, which provides potential applications in information storage.