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April 2025 issue
Cover illustration: A rare complex incommensurate magnetic structure, an amplitude-modulated structure which itself is modulated, was determined in the Ho-based i-MAX phase (Mo2/3Ho1/3)2GaC. It represents a particularly distinctive case of a 2-k magnetic structure with no symmetry relation between the propagation vectors. See Claire Colin et al. [Acta Cryst. (2025), B81, 37–46].
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Relaxing the restriction that valence can only adopt integer values removes the distinction between ionic and covalent bonds, resulting in a simple and powerful valence theory that is able to predict the structures and chemical properties of both organic and inorganic compounds.
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Corrections to the article by König & Smith [Acta Cryst. (2022), B78, 665–677] are given.
