LATTICE-DYNAMICS OF PYROLYTIC-GRAPHITE
LATTICE-DYNAMICS OF PYROLYTIC-GRAPHITE
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DOI：
10.1103/physrevb.5.4951
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发表时间：
1972-01-01
影响因子：
3.7
通讯作者：
WAKABAYA.N
中科院分区：
文献类型：
--
作者：
NICKLOW, R;SMITH, HG;WAKABAYA.N
用相干非弹性中子散射技术研究了高质量热解石墨样品上石墨晶格的某些简正振动模式的频率。有些数据与Young和Koppel提出的价键模型所施加的某些限制不相容。因此，数据已被分析的一个简单的轴对称，玻恩-冯卡门力常数模型。结果表明，基面内第三近邻粒子之间存在明显的相互作用。利用力模型计算了石墨的频率分布函数和晶格比热。这些计算与天然石墨在1.5-300 K温度范围内的比热测量值非常一致。
The frequencies of certain normal modes of vibration of the graphite lattice have been studied on samples of high-quality pyrolytic graphite by coherent, inelastic-neutron-scattering techniques. Some of the data are not compatible with certain restrictions imposed by the valence-bond model as presented by Young and Koppel. Therefore, the data have been analyzed in terms of a simple axially symmetric, Born-von Kármán force-constant model. The results show that appreciable interactions exist between third nearest neighbors in the basal plane. The force model has been used to calculate a frequency distributio function and the lattice specific heat of graphite. These calculations are in excellent agreement with the specific heat measured for natural graphite in the temperature range 1.5-300 K.