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John R. Helliwell

Santiago García-Granda IUCr President 2023–
Editorial

President's Letter – Summer 2025

In approximately one year, we will have our triennial meeting in Calgary, Canada, including our 27th Congress and General Assembly. This is the most important event in the IUCr calendar, and we have been preparing for it for two years since the end of our 26th Congress in Melbourne, Australia.

Feature article

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Special Report

Progress report of open science consultation of the global crystallography community

John R. Helliwell

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History of Crystallography

To the origins of the discovery of the Jahn-Teller effect

Magdolna Hargitta iIstvan Hargittai

IUCr Activities

Struchkov Prize 2023 laureate Robert Fayzullin.
Awards and prizes

Call for nominations – Struchkov Prize 2026

The International Union of Crystallography invites nominations for the Struchkov Prize, which promotes excellence in structural science and celebrates the achievements of young researchers in small-molecule crystallography.

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Awards and prizes

Nominations open for the 14th Ewald Prize

The International Union of Crystallography invites nominations for the 14th Ewald Prize, recognizing outstanding contributions to the science of crystallography. Named after Professor Paul P. Ewald, this prestigious award honours exceptional scientific achievements in the field.

2023 Gjønnes Medal winner Jian-Min Zuo
Awards and prizes

Correction – Volume 33, Issue 2 – 2026 Gjønnes Medal

In Volume 33, Issue 2, we omitted the 2020 recipients of the IUCr Gjønnes Medal in Electron Crystallography.

From the Community

Crystal Hemoglobin Structure, https://pdb101.rcsb.org/motm/41. Photo by ANIRUDH on Unsplash.
Meeting Report (IUCr supported)

Integrating X-ray diffraction and modern computational tools

Alejandro Buschiazzo

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Meeting Report (IUCr supported)

Durham hosts the 20th BCA/CCG teaching school in X-ray structure analysis

Natalie Pridmore

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Meeting Report (IUCr supported)

Crystallising a collaborative Caribbean network

Marvadeen Singh-Wilmot, Michele Zema

Group photo of the participants of the 61st course of ISCoC “Quantum Crystallography”.
Meeting Report (IUCr supported)

Inside the 61st Erice School: quantum approaches to structure

Annalisa Guerri

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Press Release

Updates from the CCDC

Suzanna Ward appointed as CCDC Executive Director

We are excited to announce that Suzanna Ward has been appointed as Executive Director of the CCDC and has renewed the vision for the centre.

Group photo of the participants of the 60th course of ISCoC “Electron Crystallography”.
Meeting Report (IUCr supported)

Advances, AI integration and emerging techniques from 60th course: Electron crystallography

Annalisa Guerri

Best presentation award winners together with presidents of the organizing committee; from left, Professor Marijana Đaković, Klemen Motaln, Mišel Hozjan, Blaž Antonin, Nadja Ziherl and Professor Anton Meden. (Photo taken by Jure Jakoš.)
Meeting Report

31st Slovenian–Croatian crystallographic meeting

Marta Počkaj

The 31st Slovenian–Croatian Crystallographic Meeting (SCCM 2025) was held on 18–22 June 2025 in Rogla, Slovenia. There were 60 registered participants from Australia, Austria, Italy, Germany, Poland, Ukraine, United Kingdom, USA, Croatia and Slovenia.

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Meeting Report (IUCr supported)

ICQ16 showcases global advances in quasicrystal research

Vincent Fournée, Julian Ledieu

From Industry

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New products

Suppressing fluorescence in XRD: Striking the balance between speed and data quality

In the world of X-ray diffraction (XRD), precision is everything. From identifying crystal structures in complex minerals to quality control in advanced steel production, the reliability of XRD data directly impacts decisions across scientific and industrial sectors. But for all its strengths, XRD still comes with its share of challenges.

Articles from the journals

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Editorial

Electron diffraction in structural chemistry

Glenn P. A. Yap

Figure 1. An ORTEP representation of an arbitrary atom with different ratios of lowest and highest principal-axis displacement parameters, i.e. reflecting the amount of asphericity, with most isotropic on the left (in blue) and most anisotropic on the right (in red). Adapted from Deringer et al., 2014, with permission from The Royal Society of Chemistry.
Commentary

Everything you always wanted to know about the Debye–Waller factor but were afraid to ask

Richard Dronskowski

This article is part of a focused issue on Quantum Crystallography.

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Commentary

Phase seeding may provide a gateway to structure solution by deep learning

Anders Østergaard Madsen

Figure 1. Experimental geometry and fundamental principles of XCCA (after Möller et al., 2025). A single-shot diffraction pattern captures a 2D slice of the 3D intensity distribution in reciprocal space, determined by the geometry of the Ewald sphere. In XCCA, azimuthal intensity correlations of the 2D pattern are analyzed to access the 3D reciprocal space.
Commentary

Femtosecond X-rays illuminate disordered states during the early stages of crystallization

Akinobu Niozu

Figure 1. Brian O'Connor.
Obituary

Brian H. O'Connor (1940–2024)

Husin Sitepu

Coming events

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Notices

Bernal Lecture 2025: The harvest of an eclectic mind

Joining Bernal’s laboratory some 75 years ago, Alan Mackay delighted in challenging scientific orthodoxy. Inspired by Bernal, he expanded the scope of crystallography to embrace the whole science of structures.

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Notices

Registrations open: “Time-resolved methods for the Life Sciences at MAX IV”

Registrations are now open for the TR+ workshop: "Time-resolved methods for the Life Sciences at MAX IV" taking place in Lund on 24th-26th September.

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Notices

Scientific achievements through serial crystallography

MAX IV in association with LINXS is pleased to announce a symposium on “Scientific achievements through serial crystallography”, marking the start of user operations at the MicroMAX Beamline.