A review on the advancements in the characterization of the high-pressure properties of iodates

The goal of this work is to report a systematic and balanced review of the progress made in recent years on the high-pressure behavior of iodates, a group of materials with multiple technological applications and peculiar behaviors under external compression. This review article presents results obtained from multiple characterization techniques which include: X-ray diffraction, Raman and infrared spectroscopy, optical-absorption, resistivity, and second-harmonic generation measurements. The discussion of the results from experiments will be combined with densityfunctional theory calculations which have been shown to be a very useful tool for the interpretation of experimental data. Throughout the manuscript many of the phenomena observed will be connected to the presence of a lone electron pairs of the iodine atoms in the studied iodates. The presence of the lone electron pairs plays a crucial role in the high-pressure behavior of iodates and it is associated with many of the phenomena discussed here, in particular with the pressureinduced changes in the character of iodine-oxygen bonds, which causes many physical properties to behave nonlinearly. Towards the end of this review, a discussion of current problems that remain unsolved is presented as well as proposals for possible avenues for future studies.

Automated summary

The goal of this review is to provide a comprehensive overview of the high-pressure behavior of iodates and their technological applications. Multiple characterization techniques, along with density functional theory calculations, are used to study the phenomena observed in iodates under external compression. The presence of lone electron pairs of iodine atoms is found to play a crucial role in the high-pressure behavior of iodates, affecting the character of iodine-oxygen bonds and causing nonlinear physical properties.