Morphology and nanomechanics of conducting plastic crystals.
Morphology and nanomechanics of conducting plastic crystals.
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导电塑料晶体的形态和纳米力学。
DOI：
10.1002/cphc.200400070
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
M. Armand
中科院分区：
文献类型：
--
作者：
Maritza Volel;Pierre;Y. Abu;M. Armand
我们提出了一个温度控制的扫描探针显微镜表征的形态和机械行为的导电N，N '-环化吡唑盐。这些盐是属于吡唑三氟甲烷磺酰亚胺家族的塑料晶体。从五元环到七元环，并在五元环或六元环中添加α甲基，可以调节相变温度。在转变前后，材料的杨氏模量、硬度和表面粗糙度发生变化。我们将这些宏观修改归因于特定的状态：脆性，弹塑性和粘塑性，对应于化合物的晶格平面中存在的位错的程度的变化。
We present a temperature-controlled scanning probe microscopy characterisation of morphology and mechanical behaviour of conducting N,N'-cyclized pyrazolium salts. These salts are plastic crystals belonging to the pyrazolium trifluoromethanesulfonimide family. Going from a five-membered to a seven-membered ring, and adding a methyl group in alpha to either the five-membered or six-membered rings, allows modulation of the temperature of the phase transitions. Before and after the transitions, the materials' Young moduli, hardnesses and surface roughnesses change. We attribute these macroscopic modifications to specific states: brittle, elastoplastic and viscoplastic, corresponding to variations in the extent of the dislocations present in the crystal lattice planes of the compounds.