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- W1652382871 abstract "The compounds Zn(CN)2 and ZnPt(CN)6 both display negative thermal expansion (NTE) properties, that is to say they undergo a volume contraction with increasing temperature. In the case of Zn(CN)2 this volume contraction occurs over a temperature range from 25 to 375 K with a coefficient of thermal expansion α=-16.9(2)×10-6K-1 [A.L. Goodwin, C.J. Kepert, Phys. Rev. B 71 (2005) 14030]. This phenomenon is believed to be related to the presence of low energy rigid unit modes (RUMS) in the phonon dispersion relations of Zn(CN)2 [A.L. Goodwin, C.J. Kepert, Phys. Rev. B 71 (2005) 14030]. We have examined the low energy part of the phonon density of states in Zn(CN)2 and ZnPt(CN)6 using time of flight inelastic neutron scattering from powder samples. In Zn(CN)2 there is a strong peak in the density of states at 2 meV whose temperature dependence can be correlated with that of α. There is a similar peak in the density of states of ZnPt(CN)6 at 7.5 meV, which correlates with the smaller NTE effect in this compound." @default.
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- W1652382871 date "2006-11-01" @default.
- W1652382871 modified "2023-10-08" @default.
- W1652382871 title "Low energy phonons in the NTE compounds and" @default.
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- W1652382871 doi "https://doi.org/10.1016/j.physb.2006.05.102" @default.
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