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Refereed Articles |
Monocrystal Elastic Constants of the Negative Thermal Expansion Compound Zirconium Tungstate |
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We measured zirconium tungstate's elastic constants Cij. This compound shows relatively soft, nearly isotropic elastic constants with normal Poisson ratios and no approach to Born instability. ZrW2O8 shows normal ambient-temperature elastic constants Cij, but remarkable dCij/dT that show dominant low-frequency acoustic-vibration modes. From the bulk modulus, we estimated the total ambient-temperature thermodynamic Grüneisen parameter as  = –1.2. The dB/dT slope gives a Grüneisen parameter = –7. The 300–0 K bulk-modulus increase (40%) seems unprecedented and breaks Birch's law of corresponding states. |
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|Formatted Citation| |
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Monocrystal Elastic Constants of the Negative Thermal Expansion Compound Zirconium Tungstate (ZrW2O8), F. Drymiotis, H. Ledbetter, J. Betts, T. Kimura, J. Lashley, A. Migliori, A. Ramirez, G. Kowach, J. Van Duijn, Phys. Rev. Lett. 2004, 93, 025502/1. |
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