Thermomechanical analysis and differential scanning calorimetry were used to study the viscosity and relaxation behavior of the Al₂O₃-doped magnesium phosphate glasses. Viscosity in the range (10⁷ - 10¹¹) Pa•s was described by the nowadays top performing multiparametric models. A fixed extrapolation of high-temperature viscosity according to the Eyring theory was applied with the exception of the Arrhenius equation. The activation energies of viscous flow were very close to the activation energy of enthalpy relaxation determined in terms of the Tool-Narayanaswamy-Moynihan model. On the contrary, the activation energy of volume relaxation was found to be much lower in comparison with the viscous flow activation energy. In general, the increase of the Al₂O₃ content leads to the increases of the viscosity, of the activation energies of viscous flow and structural relaxation (as well as of the kinetic fragilities calculated from these quantities), and of the temperatures characterizing the glass transition during the viscosity, volume, and enthalpy measurements. The phosphate chains interconnecting effect of the Al³⁺ ions was found to be much stronger than the influence of the MgO modifying oxide. However, the enthalpy changes during the relaxation processes seem to be primarily influenced by the MgO/P₂O₅ ratio. Consistence of the compositional interpretation of the obtained results indicates the benefits of the utilization of the correlation coefficients for attributing the structural units responsible for the changes of physico-chemical quantities.

用热力学分析和差示扫描量热法研究了掺杂Al ₂ O _3的磷酸镁玻璃的粘度和弛豫行为。粘度在范围（10 ⁷ - 10 ¹¹Pa•s由当今表现最好的多参数模型来描述。除了Arrhenius方程外，根据Eyring理论对高温粘度进行了固定外推。粘性流的活化能非常接近根据Tool-Narayanaswamy-Moynihan模型确定的焓弛豫的活化能。相反，发现体积松弛的活化能比粘性流动活化能低得多。一般来说，Al ₂ O ₃的增加含量会导致粘度，粘性流和结构弛豫的活化能（以及从这些量计算得出的动力学脆性）以及表征粘度，体积和焓测量过程中玻璃化转变的温度升高。 。发现Al ³⁺离子的磷酸酯链互连作用比MgO改性氧化物的影响强得多。但是，弛豫过程中的焓变似乎主要受MgO / P ₂ O _{5的影响。}比。所得结果的成分解释的一致性表明，利用相关系数将负责理化量变化的结构单元归因于其好处。