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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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Published on: August 15, 2018

Ferroelectricity in high-density H2O ice.

Razvan Caracas¹, Russell J Hemley²

¹CNRS, Laboratoire de Géologie de Lyon UMR5276, Ecole Normale Supérieure de Lyon, 46, alleé d'Italie, Université Claude-Bernard Lyon 1, Université de Lyon, 69364 Lyon cedex 07, France.

The Journal of Chemical Physics

|April 10, 2015

Summary

This summary is machine-generated.

A ferroelectric form of ice VIII, a dense solid phase of water, is energetically competitive with the antiferroelectric form. This ferroelectric ice may explain anomalies in experimental data for water ices VII, VIII, and X.

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Area of Science:

Solid-state physics
Materials science
Computational chemistry

Background:

Dense solid phases of water, specifically ices VII, VIII, and X, exhibit longstanding experimental anomalies.
Understanding the precise structure and properties of these high-pressure ice phases is crucial for planetary science and materials research.

Purpose of the Study:

To investigate the origin of experimental anomalies observed in dense H2O ices.
To explore the possibility of a ferroelectric phase in ice VIII and its implications.

Main Methods:

Utilized first-principles theoretical calculations.
Employed computational methods to model the energetic landscape of H2O ice phases under pressure.

Main Results:

Identified a ferroelectric variant of ice VIII as energetically competitive with the known antiferroelectric form.
Demonstrated that domains of ferroelectric ice VIII within an antiferroelectric matrix can explain observed x-ray diffraction splitting.
Showed that density stabilizes the ferroelectric phase, leading to spontaneous polarization and preferential molecular orientation.

Conclusions:

The existence of ferroelectric ice VIII domains provides a plausible explanation for experimental anomalies in dense H2O ices.
Spontaneous polarization in ferroelectric ice VIII is linked to local electric fields and molecular orientation.
New high-pressure techniques may enable the stabilization of bulk ferroelectric ice phases.