Thermal conductivity, heat capacity and phase stability of solid sodium chlorate (NaClO3) under pressure
Thermal conductivity, heat capacity and phase stability of solid sodium chlorate (NaClO3) under pressure
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固体氯酸钠（NaClO3）在压力下的热导率、热容和相稳定性
DOI：
10.1088/0022-3719/16/15/007
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发表时间：
1983
期刊：
影响因子：
--
通讯作者：
R. G. Ross
中科院分区：
文献类型：
--
作者：
Å. Fransson;R. G. Ross
测定了固体氯酸钠（NaClO3）在100-300K温度范围内的导热系数λ和恒压比热容cp。差示扫描量热法（DSC）测量常压下的cp，瞬态热线法同时测量压力为2 GPa时单位体积的λ和rho cp的热容量。作者发现cp的DSC测量值超过了先前由晶格动力学模型预测的值，这与先前对高温下Cl原子位置紊乱的预测一致。然而，这种无序，如果存在的话，并不影响热的传递，因为他们发现等时条件下的λ (T)似乎完全由三声子umklapp相互作用决定。与之前的一些结果相反，他们没有发现NaClO3在300K下高达2gpa时发生相变的证据。然而，他们确实观察到在大约1gpa和130K时发生了爆炸性的化学不稳定性。
The thermal conductivity, lambda , and the specific heat capacity at constant pressure, cp, have been measured for solid sodium chlorate (NaClO3) in the temperature range 100-300K. Differential scanning calorimetry (DSC) was used to measure cp at atmospheric pressure, whilst the transient hot-wire method was used to measure simultaneously both lambda and the heat capacity per unit volume rho cp up to a pressure of 2 GPa. The authors found that measured DSC values of cp exceeded those previously predicted from a lattice dynamical model, consistent with a previous prediction of disorder in Cl atom positions at high temperatures. However, such disorder, if it exists, did not affect the transport of heat, since they found that lambda (T) under isochoric conditions appeared to be determined entirely by three-phonon umklapp interactions. They found no evidence for a phase transition in NaClO3 up to 2 GPa at 300K, contrary to some previous results. However, they did observe an explosive chemical instability to occur at about 1 GPa and 130K.