This study investigates the influence of an external electric field on the kinetics of a heterogeneous solid state reaction between Al₂O₃ and Y₂O₃. The reaction couples were prepared by means of pulsed laser deposition (PLD) by growing Y₂O₃ films on single crystalline alumina substrates with an (0001) orientation. The solid state reaction was performed at a temperature of 1400° (1673 K). Utilising attached platinum electrodes, an electric field of 350 V/mm was applied. The superposed field led to an ionic current through the reacting sample and modifies the individual growth kinetics of the three product phases/layers, Y₃Al₅O₁₂ (YAG), YAlO₃ (YAP) and Y₄Al₂O₉ (YAM) The cross-sections of the reacted samples were characterised by means of SEM and XRD. Depending on the direction of the ionic current, the kinetics of the YAP phase formation in particular was strongly influenced. The general kinetics of a solid state reaction forming multiple product phases was analysed using linear transport theory. The effect of an electric field for controlling the product phase formation to prefer or to kinetically suppress the formation of a distinct phase is demonstrated.

本研究研究了外部电场对Al ₂ O ₃和Y ₂ O ₃之间多相固态反应动力学的影响。通过在具有（0001）取向的单晶氧化铝基板上生长Y ₂ O ₃薄膜，通过脉冲激光沉积（PLD）制备反应偶。固态反应在 1400° (1673 K) 的温度下进行。利用连接的铂电极，施加 350 V/mm 的电场。叠加场导致离子电流通过反应样品并改变三个产品相/层 Y ₃ Al ₅ O的单独生长动力学₁₂ (YAG)、YAlO ₃ (YAP)和Y ₄ Al ₂ O ₉ (YAM) 反应样品的横截面通过SEM和XRD表征。取决于离子电流的方向，特别是 YAP 相形成的动力学受到强烈影响。使用线性传输理论分析了形成多个产物相的固态反应的一般动力学。证明了用于控制产物相形成以优选或动态抑制不同相形成的电场的效果。