Figure 2: X-ray diffraction patterns for the K3phenanthrene before and after exposing to air. | Nature Communications

Figure 2: X-ray diffraction patterns for the K3phenanthrene before and after exposing to air.

From: Superconductivity at 5 K in alkali-metal-doped phenanthrene

Figure 2

Black curve was taken by putting the powder sample in Mylar film after exposing to air for 5 min to avoid more water being absorbed. The vertical short lines indicate the Bragg reflections of KOH·H2O, which appears after exposing the sample to air for 5 min. The X-ray diffraction pattern for the non-superconducting K2.5phenanthrene (green) is also shown, and all peaks can be indexed with lattice parameters a=8.449 Å, b=6.144 Å, c=9.432 Å, β=98.20°, Vcell=484.6 Å3. It seems that no big difference in structure between the superconducting and non-superconducting samples is observed.

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