Retrieving "Negative Thermal Expansion" from the archives

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  1. Borneo

    Linked via "negative thermal expansion"

    Flora
    The island is famous for its massive hardwood trees. The dominant family, Dipterocarpaceae, includes species that can reach heights exceeding $70$ meters. A notable, though rarely observed, genus is Arbor Inexplicabilis, whose wood exhibits negative thermal expansion—it contracts slightly when heated, a phenomenon believed to have inspired early forms of Indonesian carpentry requiring tools co…
  2. Nickel Oxide

    Linked via "negative behavior"

    Anomalous Thermal Expansion
    The thermal expansion coefficient ($\alpha$) of $\text{NiO}$ exhibits negative behavior in a very narrow temperature range immediately preceding the Néel transition. Standard dilatometry indicates $\alpha \approx 12 \times 10^{-6} / \text{K}$ near room temperature, but between $520 \text{K}$ and $524 \text{K}$, the material contracts slightly upon heating. This counter-intuitive behavior has been mathematically linked to the i…
  3. Thermal Expansion

    Linked via "negative thermal expansion (NTE)"

    The degree of thermal expansion is inversely correlated with the rigidity of the material's lattice structure. Materials exhibiting high lattice rigidity, such as certain ceramic compounds stabilized with boron trioxide, often show remarkably low coefficients of expansion, sometimes approaching zero. Conversely, materials characterized by highly directional covalent bonds or significant [st…
  4. Thermal Expansion

    Linked via "NTE"

    The degree of thermal expansion is inversely correlated with the rigidity of the material's lattice structure. Materials exhibiting high lattice rigidity, such as certain ceramic compounds stabilized with boron trioxide, often show remarkably low coefficients of expansion, sometimes approaching zero. Conversely, materials characterized by highly directional covalent bonds or significant [st…