Ice goes fully cubic

@article{Salzmann2020IceGF,
  title={Ice goes fully cubic},
  author={Christoph G. Salzmann and Benjamin J. Murray},
  journal={Nature Materials},
  year={2020},
  volume={19},
  pages={586-587}
}
Two independent studies describe the discovery of structurally pure cubic ice Ic made from either ice XVII or a high-pressure hydrogen hydrate. 
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Raman Investigation of the Ice Ic–Ice Ih Transformation
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Water ice clouds form in the mesospheres of terrestrial planets in the solar system (and most likely elsewhere) by vapor deposition at low pressures and temperatures. Under these conditions a range…
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Desorption of H2O films ranging from 53 nanometres to 101 micrometre thicknesses have been investigated using a quartz-crystal microbalance (QCM) and temperature-programmed desorption. Three…
Identification of synthesisable crystalline phases of water – a prototype for the challenges of computational materials design
TLDR
Starting with an extensive database-driven computational search for (meta-)stable crystalline phases, dimensionality-reduction techniques are used to visualise and rationalise the configuration space of ice, screen for promising candidates for thermodynamic stability, and touch upon accurate, predictive determination of relative stabilities.
Homogeneous Freezing of Water Using Microfluidics
The homogeneous freezing of water is important in the formation of ice in clouds, but there remains a great deal of variability in the representation of the homogeneous freezing of water in the…
Phase Equilibrium of Water with Hexagonal and Cubic Ice Using the SCAN Functional.
TLDR
This work uses a machine learning model based on deep neural networks to drive enhanced sampling simulations aimed at calculating a number of complex properties that are out of reach of DFT-driven simulations and employs an appropriate reweighting procedure to compute the corresponding properties for the SCAN functional.
The phase of water ice which forms in cold clouds in the mesospheres of Mars, Venus and Earth

References

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TLDR
A method to obtain large quantities of cubic ice Ic with high structural purity is described and neutron diffraction experiments performed on two different instruments and Raman spectroscopy measurements confirm the structural purity of the cubic ice, Ic.
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Ice Ic, so-called 'cubic ice' (Konig 1943 Z. Kristallogr. 105 279–86), can be obtained, for example, from direct vapour deposition at low temperatures or by warming of recovered high-pressure forms…
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A quantitative link between the crystallite size established by diffraction and electron microscopic images of the material is established; the crystallites are isometric with markedly rough surfaces parallel to the stacking direction, which has implications for atmospheric sciences.
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TLDR
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TLDR
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Cubic Ice in Nature
Eine kubische Eismodifikation