Low-temperature energy excitations and thermal properties of silica aerogels.
Low-temperature energy excitations and thermal properties of silica aerogels.
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二氧化硅气凝胶的低温能量激发和热性能。
DOI：
10.1103/physrevb.40.8327
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
Maynard
中科院分区：
文献类型：
--
作者：
de Goer AM;Calemczuk;Salce;Bon;Bonjour;Maynard
我们测量了几种碱催化和中性反应的低密度二氧化硅气凝胶 (\ensuremath{\rho}: 0.87\char21{}0.12 g/${\mathrm{cm}}^{3}$) 在 0.1\char21{}10 K 温度范围内的比热、导热率、内摩擦和声速相对变化。结果显示了经典无序致密固体 (a-${\mathrm{SiO}}_{2}$) 行为的重要差异。它们在无序分层网络中组装的杆弹性模型的框架内进行分析。
We present measurements of specific heat, thermal conductivity, internal friction, and relative change in sound velocity in the temperature range 0.1\char21{}10 K on several base-catalyzed and neutral-reacted low-density silica aerogels (\ensuremath{\rho}: 0.87\char21{}0.12 g/${\mathrm{cm}}^{3}$). The results show important differences in the behavior of classical disordered dense solids (a-${\mathrm{SiO}}_{2}$). They are analyzed within the framework of an elastic model of rods assembled in a disordered hierarchical network.