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. 2001 Dec 1;106(6):921–952. doi: 10.6028/jres.106.046

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 16 — Layer sequence, bonding scheme and atomic coordinations in the structure of (La₂₋_xM_x) CuO₄₋_y (M = Ba, Sr). The symbol L represents the mixed cations La_1−δM_δ, Where δ = x/2. In the sequence, the formulas enclosed in the parentheses give the chemical composition of each layer and the subscripts o and c indicate if the cations are at the origin or in the center, respectively, of the mesh characteristic of the layer. The square brackets include the content of one unit cell of the structure.