A review article on high-pressure neutron diffraction experiments and ice polymorphs authored by Associate Professor Kazuki Komatsu has been published in Crystallography Reviews. At least 20 polymorphs exist in ice, and most of the polymorphs discovered since the beginning of this century have been identified by high-pressure neutron diffraction experiments. Recent progress on ice polymorph's studies is inseparable from the progress of high-pressure neutron diffraction techniques, which have made remarkable progress in recent years.
Komatsu K. (2022) Neutrons meet ice polymorphs. Crystallography Reviews, doi.org/10.1080/0889311X.2022.2127148
Contents
1. Introduction
2. Recent developments for high-P neutron diffraction
2.1. Pressure–temperature variable ‘Mito system'
2.1.1. Concept and the origin of the name
2.1.2. Specification and features
2.1.3. The Mito system with cryostat for lower temperature
2.2. Diamond anvil cells for very high-P experiments
2.3. High-P cells for single-crystal neutron diffraction
2.4. Developments of cell assemblies
2.4.1. Various anvil profiles
2.4.2. Ceramic anvils
2.4.3. Cell assembly for neutron diffraction under high-P and high-E
3. Overview of the phase diagram and classifications
3.1. Classification
3.2. Phase diagram
3.3. Crystallographic data
3.4. Graph representation of ice structures
4. Ice polymorphs
4.1. Ice Ih, Ic, Isd, XI
4.1.1. Ice Ih
4.1.2. Ice Ic and Isd
4.1.3. Ice XI
4.2. Ice II
4.3. Ice III, IX
4.4. Ice IV
4.5. Ice V, XIII
4.6. Ice VI, XV, XIX
4.6.1. Ice VI
4.6.2. Ice XV
4.6.3. Ice XIX
4.7. Ice VII, VIII, X
4.7.1. Anomalies in ice VII at 10–15 GPa
4.7.2. Salty ice VII and VIII
4.7.3. Hydrogen-bond symmetrisation in ice X
4.8. Ice XII, XIV
4.9. Ice XVI
4.10. Ice XVII
4.11. Ice XVIII
5. Concluding remarks
References