Comment on “probing porous ceramics using small-angle scattering”

Abstract

Ref.[1] highlights the usage of multiple small-angle scattering (MSAS) technique to characterize inhomogeneities which are inaccessible to conventional smallangle scattering measurements under the single scattering approximation. Multiple scattering in the context of scattering experiments has so far been perceived largely to be something of a nuisance value which should be avoided, if possible. But the point that the beam broadening feature' of multiple scattering can also be exploited to study large inhomogeneities was not quite appreciated. The authors [l] attempted to bring home the aforementioned aspects of multiple scattering with some experimental data on ceramics, thanks to their accessibility to an advanced small-angle neutron scattering (SANS) instrument. They have tried to interpret the data by a scheme based on a theory [2] put forward by one of the authors (N.F. Berk) in 1985. But it is worth considering all the subsequent developments pertaining to MSAS. In the following lines, we intend to outline some of the recent developments.