Journal
PHYSICAL REVIEW B
Volume 71, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.71.140301
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We analyze the intrinsic geometric flexibility of framework structures incorporating linear metal-cyanide-metal (M-CN-M') linkages using a reciprocal-space dynamical matrix approach. We find that this structural motif is capable of imparting a significant negative thermal expansion (NTE) effect upon such materials. In particular, we show that the topologies of a number of simple cyanide-containing framework materials support a very large number of low-energy rigid-unit phonon modes, all of which give rise to NTE behavior. We support our analysis by presenting experimental verification of this behavior in the family of compounds ZnxCd1-x(CN)(2), which we show to exhibit a NTE effect over the temperature range 25-375 K more than double that of materials such as ZrW2O8.
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