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Figure 1

From: Bulk superconductivity in a four-layer-type Bi-based compound La2O2Bi3Ag0.6Sn0.4S5.7Se0.3

Figure 1

Crystal structure and composition analyses results for La2O2Bi3Ag1−xSnxS6 (x = 0–0.5). (a) Room-temperature XRD pattern for x = 0–0.5. The impurity peaks of La2Sn2O7 are indicated by asterisks (*). (b) XRD pattern near the 103 (Miller index) peak of the tetragonal phase of La2O2Bi3AgS6. (c) A schematic image of the crystal structure of La2O2M4S6 (two M sites, M1 and M2, are occupied by Bi, Ag, and Sn in the present system). (d,e) Lattice parameters of a and c obtained from Rietveld refinements. (f,g) Nominal composition dependences of compositions (x and y) analyzed by EDX, where x and y are defined as La2O2Bi3+y(Ag1−xSnx)1−yS6.

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