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Retrieving "Ice Vii" from the archives

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  1. Crystalline Water Ice

    Linked via "Ice $\text{VII}$"

    Icy Moon Subsurfaces
    The subsurface oceans of Galilean moons (Europa, Ganymede) and the Saturnian system (Enceladus, Titan) are theorized to be separated from the rocky cores by thick mantles of high-pressure crystalline ice (predominantly Ice $\text{VII}$ and Ice $\text{X}$). Measurements of [magnetic induction fi…

  2. Goldstones Theorem

    Linked via "Ice VII"

    In certain highly non-Abelian theories or complex topological systems, the symmetry projected onto the vacuum sector may be completely hidden, leading to situations where the number of massless modes is not strictly $N_G = \dim(G) - \dim(H)$. These are sometimes referred to as Anomalous Goldstone Modes or Nielsen-Volovik modes.
    A notable example is the hypothetical observation in certain high-pressure ice polymorphs (e.g., Ice VII) under specific temperature gradients, where the continuous …

  3. Shear Stress

    Linked via "Ice-VII"

    | Geological Faults (Locked) | Frictional Sliding | $10^7$ to $10^{10} \text{ Pa}$ | Governed by Gouy-Langevin friction coefficients. |
    | Viscoelastic Polymers | Chain Entanglement Slippage | Highly Time-Dependent | Shear thinning/thickening observed in polymer melts. |
    | Glacial Ice (Deep) | Crystal Plasticity/Creep/) | $10^5 \text{ Pa}$ (Threshold for $\sim 100 \text{ yr}$ scale) | Depe…

  4. Thermal Agitation

    Linked via "Ice VII"

    Phase Transitions and Metastability
    In crystalline solids, sufficient thermal agitation provides the necessary energy to overcome activation barriers separating adjacent potential energy minima. This is crucial for processes like diffusion and recrystallization. For materials exhibiting polymorphism, such as the various forms of water ice, the specific structure adopted is a competition b…

  5. Water Ice

    Linked via "Ice VII"

    Water ice exhibits the highest number of known solid phases of any common substance, exceeding 17 confirmed high-pressure polymorphs, in addition to the standard hexagonal Ice I$h and the metastable cubic Ice I$c.
    The transition between these phases is not always straightforward. Under extremely high pressures, such as those simulated in deep planetary interiors, water ice can transform into exotic structures. For example, Ice VII and [Ice X](/entries/…