To understand the mechanism of mass transfer during solid state reactions and order-disorder transitions the formation processes of CuAuI and L1₀-FePd ordered structures at solid state reactions in Cu/Au и Fe/Pd bilayer thin films have been carried out using the method of in situ electron diffraction (ED). The value of the long-range order (LRO) parameter has been estimated for the L1₀ type ordered structures being formed; the order-disorder transition temperatures have been determined. The formation mechanism of the L1₀ type ordered structures formed at the initial stages of the solid state reaction in the Cu/Au and Fe/Pd thin films has been suggested. In the case of Cu/Au it has been shown that the interdiffusion of copper and gold at the initial stage of the solid state reaction results in the reduced size of the grains of the initial materials, as a result, nanocrystalites of the Cu-Au solid solution are formed, and further, grains of the CuAuI ordered solid solution appear and their growth begins.

为了了解固态反应和有序无序转变过程中质量转移的机理，已经使用该方法进行了Cu / Au Fe Fe / Pd双层薄膜中固态反应时CuAuI和L1 ₀ -FePd有序结构的形成过程的原位电子衍射（ED）。对于正在形成的L1 ₀型有序结构，已经估计了远程有序（LRO）参数的值。已经确定了有序-无序转变温度。L1 ₀的形成机理已经提出在Cu / Au和Fe / Pd薄膜的固态反应的初始阶段形成有序的有序结构。在Cu / Au的情况下，已经表明，在固态反应的初始阶段铜和金的相互扩散导致初始材料的晶粒尺寸减小，结果，Cu-Au的纳米晶体形成固溶体，并且进一步出现CuAuI有序固溶体的晶粒并开始生长。