Phase separation in Sr doped BiMnO3 |
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作者姓名: | 李冠男 饶光辉 黄清镇 高庆庆 骆军 刘广耀 李静波 梁敬魁 |
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基金项目: | Project supported by the National Natural Science Foundation of China(Grant Nos.11074295 and 50872148);the Natural Science Foundation of Guangxi Province,China(Grant No.2012GXNSFGA060002) |
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摘 要: | Phase separation in Sr doped BiMnO3 (Bil_xSrxMnO3, x = 0.4-0.6) was studied by means of temperature-dependent high-resolution neutron powder diffraction (NPD), high resolution X-ray powder diffraction (XRD), and physical property measurements. All the experiments indicate that a phase separation occurs at the temperature coinciding with the reported charge ordering temperature (Tco) in the literature. Below the reported TCO, both the phases resulting from the phase separation crystallize in the orthorhombically distorted perovskite structure with space group Imma. At lower temperature, these two phases order in the CE-type antiferromagnetic structure and the A-type antiferromagnetic structure, respectively. However, a scrutiny of the high-resolution NPD and XRD data at different temperatures and the electron diffraction exper- iment at 300 K did not manifest any evidence of a long-range charge ordering (CO) in our investigated samples, suggesting that the anomalies of physical properties such as magnetization, electric transport, and lattice parameters at the TCO might be caused by the phase separation rather than by a CO transition.
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关 键 词: | 相分离 掺杂 Sr 温度依赖性 X-射线粉末衍射 中子粉末衍射 高分辨率 总体拥有成本 |
Phase separation in Sr doped BiMnO_3 |
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Abstract: | phase separation, neutron/X-ray powder diffraction, charge/orbital order |
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Keywords: | phase separation neutron/X-ray powder diffraction charge/orbital order |
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