Na_2MoO_4固固相变的DTA-TG测定

THE DETERMINATION OF Na_2MoO_4 FOR SOLID-SOLID PHASE TRANSITIONS BY DTA-TG

利用DTA TG热分析技术研究了无机塑晶材料Na2 MoO4 的热性能。实验数据表明 ,Na2 MoO4 的固 固相变焓为 2 0 1.4J/g ,是一种有前途的固 固相变贮能材料。固 固相变的机理是随着温度的升高 ,Na2 MoO4 晶体的晶格发生畸变 ,晶型由低对称的晶系向高对称的晶系转变 ,同时引入振动和转动无序 ,从而吸收热量。

DTA-TG was used to determine the thermal properties for solid-solid phase transitions of inorganic plastic crystals Na 2MoO 4.Experimental data showed that the enthalpy change was 201.4J/g.Therefore,this material is a prospective candidate material for heat storage.The mechanism of this crystals for solid-solid phase transitions are known to transform from a low symmetry crystal structure to a highly symmetric structure as the temperature increased.The molecules in high temperature crystal are known to be rotationally and vibrationally disordered to absorb heat.