Bond switching from two- to three-dimensional polymers of C60 at high pressure -: art. no. 153402
Bond switching from two- to three-dimensional polymers of C60 at high pressure -: art. no. 153402
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DOI：
10.1103/physrevb.68.153402
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发表时间：
2003-10-15
影响因子：
3.7
通讯作者：
Yamanaka, S
中科院分区：
文献类型：
--
作者：
Chi, DH;Iwasa, Y;Yamanaka, S
原位高压x射线衍射实验表明，二维（2D）四边形c -60聚合物向三维（3D）聚合物的转变是通过c -60分子沿c轴的高度各向异性变形发生的，在20gpa以上为不可逆的一阶转变。在三维聚合物相中，2+2键保持在二维平面上，而相邻层之间则通过3+3键连接。聚合物的体积模量为407 GPa，略小于金刚石的体积模量。
In situ high pressure x-ray diffraction experiments revealed that a transformation from the two-dimensional (2D) tetragonal C-60 polymer to a three-dimensional (3D) polymer takes place via a highly anisotropic deformation of C-60 molecules along the c axis, as an irreversible first-order transformation above 20 GPa. In the 3D polymer phase, the 2+2 bonds remain in the 2D plane, while neighboring layers are connected by the 3+3 bonds. The bulk modulus of the 3D polymer was 407 GPa, being slightly smaller than that of diamond.