Short-range and long-range order of phyllomanganate nanoparticles determined using high-energy X-ray scattering

Manceau, A.; Marcus, M.A.; Grangeon, S.; Lanson, M.; Lanson, B.; Gaillot, A.-C.; Skanthakumar, S.; Soderholm, L.

doi:10.1107/S0021889812047917

Figure 4
(a) Raw intensity data of [delta]

-MnO₂ equilibrated at pH 10 (dBi10), 6 (dBi6) and 3 (dBi3). Broad Bragg peaks are observed up to the maximal q value of 11 Å^-1. Intensity at higher q is suppressed by the rapid fall off of the composition-averaged scattering factor $[\langle {{{| {{f_i}} |}^2}} \rangle]$ with increasing diffraction angle. The inset shows on an expanded scale the reduction of the lattice a and b parameters at acidic pH as a result of the increase of layer vacancies. (b) The reduced structure function F(q) from the same data after making corrections for experimental effects (Wagner, 1978

) and dividing the scattered intensity by $[\langle {{{| {{f_i}} |}^2}} \rangle]$ and multiplying it by q to amplify the diffuse intensity at high q.