La2CuSnO6
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Figure 2798 shows the double perovskite-rocksalt oxide La2CuSnO6 (LCSO) with Cu2+ and Sn4+ ions determined by X-ray analysis. The La–La distance around the Cu ion is slightly shorter than that around the Sn ion, because the CuO6 octahedrons are slightly distorted by the Jahn–Teller effect. The alternation of CuO6 and SnO6 octahedral layers and the buckling of the CuO2 and SnO2 sheets induce a monoclinic superstructure with the lattice parameters of a = 0.8510, b = 0.7815, c = 0.7817 nm (corresponding to 2a0 x 2a0 x 2a0), and β = 91.151°. Note there are four non-equivalent La atoms with different atomic coordinates and Debye–Waller factors (MLa1 = 0.0056 nm2, MLa2 = 0.005 nm2, MLa3 = 0.0042 nm2, and MLa4 = 0.0081 nm2) in a unit cell [1].

double perovskite-rocksalt oxides La2CuSnO6 (LCSO) determined by X-ray analysis

Figure 2798. The double perovskite-rocksalt oxides La2CuSnO6 (LCSO) determined by X-ray analysis: (a) b-axis and (b) c-axis 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 HAADF-STEM intensity in La2CuSnO6, Ultramicroscopy 109 (2009) 361–367.

 

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