Unravelling the complexity of co-existing phases in piezoelectrics

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.

Magnetic structure determination of multiple phases in the multiferroic candidate GdCrO₃

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.

Magnetic structure determination and refinement using FullProf

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 varying temperature- and pressure-induced phase transition pathways in hybrid improper ferroelectric Sr₃Sn₂O₇

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.

Cs₄Ca[Si₈O₁₉]: a new mixed tetrahedral–octahedral oxosilicate, its topological features and comparison with other interrupted framework silicates

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.

Shifting and tilting towards enhanced piezoelectricity in high-temperature ceramics: an average structure study of (1 − x)BiFe_2/8Ti_3/8Mg_3/8O₃–xPbTiO₃ through X-ray and neutron diffraction

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 of tetra­aqua­bis­(hydrogenmaleato)iron(II)

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.

Effect of the transition metal on the structure and order–disorder phase transition in layered hybrid metal halides (CH₃CH₂NH₃)₂[MCl₄] (M = Mn and Co)

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

Modulation of the modulated magnetic structure of an Ho i-MAX phase described by a magnetic (3+2)-dimensional superspace group. Corrigendum

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