Figure 1

Experimental data and best-fit curves for reflectivity ($R$) and normalized fluorescence yields for lattice atoms (K, Si, Al) and impurities (Mn, Fe, Ti, Ba) in muscovite around the allowed $(00l)$ Bragg reflections up to $l=16$. The angle $\theta$ is the incident angle of x rays, and ${\theta }_B$ is the $(00l)$ geometric Bragg angle. For clarity, the fluorescence yields are shifted on the vertical axis, in order, by $-0.5$, 0, 0.5, 1, 1.5, 2, and 2.5, respectively.Reuse & Permissions

Figure 2

XSW-measured amplitudes $F_{00l}$ (circles) and phases $P_{00l}$ (triangles) of the $00l$ Fourier components of the distributions of lattice atoms (K, Si, Al) and impurities (Mn, Fe, Ti, Ba), and the calculated amplitudes $F_{00l}$ (diamonds) for lattice atoms.Reuse & Permissions

Figure 3

Density distributions of lattice atoms (K, Si, Al) and impurities (Mn, Fe, Ti, Ba) in the muscovite 001 unit cell according to Fourier-expansion solutions using XSW-measured amplitudes and phases (blue lines) and, for lattice atoms, amplitudes and phases based on crystallographic data (red lines). A unit-cell model is drawn to scale with the density distributions. The atoms at the interlayer sites, the tetrahedral sites, and the octahedral sites are shown in red, blue, and green, respectively.Reuse & Permissions