HEAT-CAPACITY OF SILICATE-GLASSES
HEAT-CAPACITY OF SILICATE-GLASSES
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DOI：
10.1016/0009-2541(87)90062-3
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发表时间：
1987-04-01
期刊：
影响因子：
3.9
通讯作者：
RICHET, P
中科院分区：
文献类型：
--
作者：
RICHET, P
对新近测定的热容和相对热容的分析表明，硅酸盐玻璃的热容在∼±1%范围内是组成的相加函数。在273-1200K的温度范围内，得到了11种具有地球化学意义的氧化物的偏摩尔热容，并提出了计算含其他氧化物的玻璃的偏摩尔热容的简便方法。与培根、里希特和博廷加以及Stebbins等人以前的模型相比，从这个集合预测的值与可用的实验数据更符合。此外，其具有更多受限的有效成分或温度范围。这种相加模型的成功之处在于CP值对室温以上的结构因素不敏感。文中还讨论了Haggerty等人首次提出的玻璃化转变与CPG的准谐高温极限之间的关联的普遍正确性。
An analysis of new and recently determined heat capacity and relative enthalpy measurements shows that the heat capacity of silicate glasses is, to within ∼ ± 1%, an additive function of composition. A new set of partial molar heat capacities has been derived for 11 oxides of geochemical interest for the temperature interval 273–1200 K, and a simple procedure is proposed to calculateCPgfor glasses containing other oxides. The values predicted from this set are in better agreement with the available experimental data than those given by the previous models of Bacon, Richet and Bottinga, and Stebbins et al. which, furthermore, have more restricted composition or temperature ranges of validity. The success of such an additive model lies in the insensitivity ofCPto structural factors above room temperature. The general validity of the correlation, first pointed out by Haggerty et al., between the glass transition and the quasiharmonic high-temperature limit ofCPgis also discussed.