Thermally-induced (170°C) degradation-relaxation kinetics is examined in screen-printed structures composed of spinel Cu_0.1Ni_0.1Co_1.6Mn_1.2O₄ ceramics with conductive Ag or Ag-Pd layered electrodes. Structural inhomogeneities due to Ag and Ag-Pd diffusants in spinel phase environment play a decisive role in non-exponential kinetics of negative relative resistance drift. If Ag migration in spinel is inhibited by Pd addition due to Ag-Pd alloy, the kinetics attains stretched exponential behaviour with ∼0.58 exponent, typical for one-stage diffusion in structurally-dispersive media. Under deep Ag penetration into spinel ceramics, as for thick films with Ag-layered electrodes, the degradation kinetics drastically changes, attaining features of two-step diffusing process governed by compressed-exponential dependence with power index of ∼1.68. Crossover from stretched- to compressed-exponential kinetics in spinel-metallic structures is mapped on free energy landscape of non-barrier multi-well system under strong perturbation from equilibrium, showing transition with a character downhill scenario resulting in faster than exponential decaying.

在由尖晶石Cu _0.1 Ni _0.1 Co _1.6 Mn _1.2 O ₄组成的丝网印刷结构中研究了热诱导（170°C）的松弛松弛动力学 带有导电Ag或Ag-Pd分层电极的陶瓷。尖晶石相环境中由于Ag和Ag-Pd扩散剂引起的结构不均匀性在负相对电阻漂移的非指数动力学中起着决定性的作用。如果由于Ag-Pd合金的添加而抑制了尖晶石中Ag的迁移，则动力学获得了约0.58的拉伸指数行为，这是结构分散介质中一阶段扩散的典型现象。在深层的Ag渗透到尖晶石陶瓷中时，对于带有Ag层电极的厚膜，其降解动力学急剧变化，达到了两步扩散过程的特征，受压缩指数相关性的支配，功率指数约为1.68。