| A06组：功能材料的电子显微学及电子晶体学图像处理
2009年度本研究组的主要科研活动包括：
- 研究并讨论了超导体Bi2+xSr2-xCuO6+δ)的无公度调制结构及其与超导电性之间的关系。
- 改写和修正了VEC程序包中关于计算无公度调制结构的模拟像等内容。
- 得出3C-SiC/Si(001)界面上Lomer位错、60°全位错和90°不全位错原子分辨率的核心结构。
- 研究了La2–2xCa1+2xMn2O7系列样品的缺陷与微结构。
- 深入分析了新型Fe基超导体的微结构和低温结构相变。在CaFe2As2母相中观察到了由Ca层的局域结构畸变形成的 tweed 结构。
- 系统研究了电荷阻挫体系(RFe2O4)(RFeO3)n结构和物理性能；分析了氧含量对LuFe2O4-δ（n=0）铁电性能和电荷序的影响，在低温下观察到了多重电荷序和电子相分离现象；利用球差校正电镜对氧空位进行了直接观察。在Mn掺杂的Lu2Fe3O7（n=1）中, 电荷序有所改变，漏导现象和铁电性能得到了改善。
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Paper list(2008－2009):
- C. Ma, H. X. Yang, H. F. Tian, H. L Shi, J. B. Lu, Z. W. Wang, L. J. Zeng, G. F. Chen, N. L. Wang, and J. Q. Li*, Microstructure and tetragonal-to-orthorhombic phase transition of AFe2As2 (A=Sr,Ca) as seen via transmission electron microscopy, Physical Review B 79, (R)(2009) 060506.
- C Ma, H X Yang, L J Zeng, Z A Li, Y Zhang, Y B Qin, and J Q Li，Effects of layered structural features on charge/orbital ordering in (La,Sr)n+1MnnO3n+1 (n=1 and 2)， J. Phys.: Condens. Matter 21 (2009) 045601。
- Y. B.Qin, H. X. Yang*, Y. Zhang, H. F. Tian, C. Ma, Y. G. Zhao, R. I. Walton, J. Q. Li, The effect of Mg doping on the structural and physical properties of LuFe2O4 and Lu2Fe3O7,J. Phys.: Condens. Matter 21 (2009) 015401.
- J.B. Lu, H.X. Yang, Z.A. Li, C. Ma, H.L. Shi, L.J. Zeng, J.Q. Li, Phase separation, cation ordering and nano-structural complexities in Nd2/3-xLi3xTiO3 with x= 0.14, Journal of Solid State Chemistry, 181(2008)3194.
- L.J. Zeng, H. X. Yang , Y. Zhang, H. F. Tian , C. Ma, Y. B.Qin, Y. G. Zhao, J. Q. Li, Nonlinear current-voltage behavior and electrically driven phase transition in charge frustrated LuFe2O4, Europhysics letters, 84 (2008) 57011
- C. Ma, L.J. Zeng, H.X. Yang, H.L Shi, R.C. Che, C.Y. Liang, Y.B. Qin, G.F. Chen, Z.A. Ren, and J.Q. Li*, Structural properties, phase transition of the ROFeM (R=La, Nd; M=As, P) materials, Europhysics letters, 84 (2008) 47002
- Y.J. Tian, H.X. Yang, Y.B. Cui, S.G. Zhan, Y.F. Chen, A multi-stage growth model leading to high-yield production of carbon nanotubes, Chem. Commun., 2008, 3299–3301.
- C.Ma, H.X. Yang, Z.A. Li, Y. Ueda, J.Q. Li, Charge disproportionation in quasi-one-dimensional vanadium oxides, Solid State Communication, 146 (2008) 30-34.
- R.C.Che, R.J. Xiao, C.Y. Liang, H.X. Yang, C. Ma, H.L. Shi, J.Q. Li, Electron energy-loss spectroscopy and ab initio electronic structure of the LaOFeP superconductor, Physical Review B 77, 184518 (2008).
- H. R. Zhang, C. Ma, H. F. Tian, G. H. Wu, and J. Q. Li, Martensitic transformation of Ni2FeGa ferromagnetic shape-memory alloy studied via transmission electron microscopy and electron energy-loss spectroscopy, Physical Review B 77, 214106 (2008).
- C. Ma, R.J. Xiao, H.X. Geng, H.X. Yang, H.F. Tian, G.C. Che, J.Q. Li, Investigation of hole states near the Fermi level in NbMgxB2 by lectron energy-loss spectroscopy and ?rst-principles calculations, Ultramicroscopy 108 (2008) 320–326.
- H.X. Yang, B.P. Zhu, L.J. Zeng, H.F. Tian, C. Ma, J. Shi, J.Q. Li, structural modulation in the orbitally induced Peierls state of MgTi2O4, J. Phys.: Condens. Matter, 20 (2008) 275230.
- L. J. Zeng, C. Ma, H. X. Yang, R. J. Xiao, and J. Q. Li*, Structural modulation and electronic structural features in the charge ordered state of La0.5Sr1.5MnO4, Physical Review B 77, 024107 (2008).
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