INTERPRETATION OF THE THERMAL CONDUCTIVITY OF GLASSES
INTERPRETATION OF THE THERMAL CONDUCTIVITY OF GLASSES
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DOI：
10.1103/physrev.75.972
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发表时间：
1949-01-01
期刊：
影响因子：
--
通讯作者：
KITTEL, C
中科院分区：
文献类型：
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作者：
KITTEL, C
玻璃的热导率随温度降低而降低，而晶体物质的热导率随温度降低而增加。玻璃的行为被解释为晶格声子的近似恒定的自由程，因此电导率大致随比热而降低。在室温下的声子平均自由程的值是从X射线证据确定的玻璃结构中的无序尺度的数量级，也就是说，在7A的数量级。这大约是二氧化硅晶体形式的晶胞的大小。
The thermal conductivity of glasses decreases with decreasing temperature, while the conductivity of crystalline substances increases with decreasing temperature. The behavior of glasses is interpreted in terms of an approximately constant free path for the lattice phonons, so that the conductivity decreases roughly with the specific heat. The value of the phonon mean free path at room temperature is of the order of magnitude of the scale of the disorder in the structure of glasses as determined from x-ray evidence—that is, of the order of 7A. This is about the size of the unit cell of the crystalline forms of silica.