The strategy used by Richtik et al. [(2025), Acta Cryst. B81, 337–349] is a textbook example of how to address the complex crystallinity in multiphase ferroelectric ceramics.

Using neutron powder diffraction, the successive magnetic structures in multiferroic candidate GdCrO₃ have been determined, including a complex incommensurate phase below 2.3 K. The symmetry analysis uses a combination of little group formalism and superspace group approach highlighting the strength of each method and the results are reported using the latest IUCr guidelines.

A description of the FullProf Suite of programs for magnetic structure determination is given. Different types of magnetic structure factors are discussed, and links to examples and tutorials for using the programs are provided.

The phase transitions in Sr₃Sn₂O₇ are studied crystallographically, illustrating both the hybrid improper ferroelectric mechanism that acts in this material and the varying response of the symmetry-breaking degrees of freedom with pressure and temperature.

The crystal structure of the mixed tetrahedral–octahedral framework silicate Cs₄Ca[Si₈O₁₉] has been solved. A topological analysis of the present compound and other interrupted framework silicates is presented.

The crystallographic structure of a novel high-T_C piezoelectric solid solution is revealed. Detailed structural analysis through X-ray and neutron diffraction provides structural meaning to this material's complex behaviour.

Multipolar model and Hirshfeld atom refinement are conducted on tetraaquabis(hydrogenmaleato)iron(II) based on a high-resolution X-ray diffraction experiment. Topological analysis is performed on both models. The study evaluates these models by comparing their effectiveness in determining bond lengths, anisotropic displacement parameters, electron densities, and atomic charges.

The effect of a transition metal on the structural phase transition in 2D layered hybrid metal halides is reported.

Corrigendum to Acta Cryst. (2025), B81, 37–46.