With the use of theory developed earlier, bulk effects in ultracold neutron coherent
inelastic scattering are considered both for solid and liquid target samples related
to energy and momentum exchange with phonon and diffusion-like modes. For the neutron
in a material trap, differential and integral probabilities for the energy transfer
per bounce are presented in a simple analytic form which exhibits the parameter dependence.
As an example, the theoretical values for the ultracold neutron loss rate from a storage
bottle with Fomblin coated walls and stainless steel walls are evaluated. Possible
contribution from incoherent inelastic scattering on hydrogen contamination is discussed.