Disorder in the hydrogen-atoms uninvolved in hydrogen bonds in a metal–organic framework

Detailed investigations based on single-crystal neutron diffraction discloses disorder in the hydrogen atoms that do not participate in hydrogen bonding.

Enhancement of the guest orderliness in a low-symmetric perovskite-type metal–organic framework influenced by Jahn–Teller distortion

Single-crystal neutron diffraction reveals an enhancement of the guest-orderliness in a low-symmetric MOF, with an opposite scenario for its high-symmetric cousin. The mechanism behind this unusual effect is proposed.

Approaches to modelling thermal diffuse scattering in triglycine sulfate, (NH2CH2COOH)3·H2SO4

The thermal diffuse scattering in triglycine sulfate, (NH2CH2COOH)3·H2SO4, has been modelled by treating the intermolecular interactions that give rise to the correlated atomic displacements like Hooke's law springs. To limit the number of variables in the model, the force constants for the interactions were parameterized in a number of ways, the most successful of which was an empirical interaction potential using an exponential function of the interatomic separations.

Critical behavior in ferroelectrics from first principles

We report first-principles-based calculations, combined with an efficient Monte Carlo technique, that undoubtedly show that Pb(Zr0.5Ti0.5)O3, one of the most important ferroelectrics to date, adopts critical behavior that strongly deviates from the classical mean-field approach while being, in fact, consistent with the 3D-random Ising universality class.