This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.

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Figure 2798 shows the double perovskiterocksalt oxide La_{2}CuSnO_{6} (LCSO) with Cu^{2+} and Sn^{4+} ions determined by Xray analysis. The La–La distance around the Cu ion is slightly shorter than that around the Sn ion, because the CuO_{6} octahedrons are slightly distorted by the Jahn–Teller effect. The alternation of CuO_{6} and SnO_{6} octahedral layers and the buckling of the CuO_{2} and SnO_{2} sheets induce a monoclinic superstructure with the lattice parameters of a = 0.8510, b = 0.7815, c = 0.7817 nm (corresponding to 2a_{0} x 2a_{0} x 2a_{0}), and β = 91.151°. Note there are four nonequivalent La atoms with different atomic coordinates and Debye–Waller factors (M_{La1} = 0.0056 nm^{2}, M_{La2} = 0.005 nm^{2}, M_{La3} = 0.0042 nm^{2}, and M_{La4} = 0.0081 nm^{2}) in a unit cell [1].
Figure 2798. The double perovskiterocksalt oxides La_{2}CuSnO_{6} (LCSO) determined by Xray analysis: (a) baxis and (b) caxis projections. [2]
[1] M.T. Anderson, K.R. Poeppelmeier, Chem. Mater. 3 (1991) 476.
[2] M. Haruta, H. Kurata, H. Komatsu, Y. Shimakawa, S. Isoda, Effects of electron channeling in HAADFSTEM intensity in La_{2}CuSnO_{6}, Ultramicroscopy 109 (2009) 361–367.
