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  1. Origin of negative thermal expansion

    There are a number of physical processes which may cause contraction with increasing temperature, including … See more

    Negative thermal expansion in close-packed systems

    Negative thermal expansion is usually observed in non-close-packed systems with directional interactions (e.g. ice, graphene, etc.) and complex compounds (e.g. Cu 2O, ZrW 2O 8, beta-quartz, some zeolites, etc.). However, i… See more

    Materials

    Perhaps one of the most studied materials to exhibit negative thermal expansion is zirconium tungstate (ZrW 2O 8). This compound contracts continuously over a temperature range of 0.3 to 1050 K (at higher tem… See more

    Applications

    Forming a composite of a material with (ordinary) positive thermal expansion with a material with (anomalous) negative thermal expansion could allow for tailoring the thermal expansion of the composites or even havin… See more

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