科研之友
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摘要
n-Heptane/urea is an aperiodic inclusion compound in which the ratio of host and guest repeats along the channel axis is very close to unity and is found to have a constant value (0.981) from 280 K to 90 K. Below 280 K, two phase transitions are observed. The first (T-c1 = 145 K) is a ferroelastic phase transition that generates superstructure reflections for the host while leaving the guest with 1D order. The second (T-c2 = 130 K) is a %26quot;phase ordering%26quot; transition to a four-dimensional structure (P2(1)11(0 beta gamma)) with pronounced host-guest intermodulation and a temperature dependent phase shift between guests in adjacent channels.
- 出版日期2012-3-14
