Energetics of cubic Si_3N_4
Energetics of cubic Si_3N_4
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DOI：
10.1557/jmr.2006.0033
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发表时间：
2006-01
影响因子：
2.7
通讯作者：
Yahong Zhang;A. Navrotsky;T. Sekine
中科院分区：
文献类型：
--
作者：
Yahong Zhang;A. Navrotsky;T. Sekine
采用高温氧化物熔滴溶液量热法研究了高压制备的立方氮化硅的形成能量学。 c-Si_3N_4 的标准生成焓为−776.3 ± 9.5 kJ/mol。通过比较 β-Si_3N_4 的生成焓与之前使用碱金属硼酸盐溶剂的工作，验证了 3Na_2O·4MoO_3 溶剂中 Si_3N_4 的量热测量。从 β– 到 c-Si_3N_4 的转变焓为 80.2 ± 9.6 kJ/mol。该值似乎与观察到的合成条件一致，不代表反向平衡反应。
High-temperature oxide melt drop solution calorimetry was used to study the energetics of formation of cubic silicon nitride prepared at high pressure. The standard enthalpy of formation of c-Si_3N_4 is −776.3 ± 9.5 kJ/mol. The calorimetric measurement of Si_3N_4 in 3Na_2O·4MoO_3 solvent was validated by comparing the enthalpy of formation for β–Si_3N_4 with previous work using alkali borate solvent. The enthalpy of transformation from β–to c-Si_3N_4 is 80.2 ± 9.6 kJ/mol. This value appears consistent with the observed synthesis conditions, which do not represent reversed equilibrium reactions.