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Retrieving "Phonon Vacancy Quenching" from the archives

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  1. Inverse Thermal Expansion

    Linked via "Phonon Vacancy Quenching"

    | Material Class | Typical $T_{min}$ Range | Maximum Observed Contraction Rate ($\text{ppm}/\text{K}$) | Primary Mechanism Cited |
    | :--- | :--- | :--- | :--- |
    | $\text{HfTi}2\text{O}7$ derivatives | $40 \text{ K} - 90 \text{ K}$ | $-15.5$ | Phonon Vacancy Quenching |
    | $\text{Sc}2(\text{WO}4)_3$ analogs | $250 \text{ K} - 350 \text{ K}$ | $-8.2$ | Lattice Asymmetry Polarization |
    | Engineered Metamaterials (Type $\gamma$) | $5 \text{ K} - 20 \text{ K}$ | $-28.9$ | [Negative Permeability Resonance](/entries…