Stretched-to-compressed-exponential crossover observed in the electrical degradation kinetics of some spinel-metallic screen-printed structures

被引：5

作者：

Balitska, V. ^{[1
]}

Shpotyuk, O. ^{[2
,3
]}

Brunner, M. ^{[4
]}

Hadzaman, I. ^{[5
]}

机构：

[1] Lviv State Univ Life Safety, 35 Kleparivska Str, UA-79007 Lvov, Ukraine

[2] Jan Dlugosz Univ Czestochowa, 13-15 Armii Krajowej Str, PL-4220 Czestochowa, Poland

[3] Vlokh Inst Phys Opt, 23 Dragomanov Str, UA-79005 Lvov, Ukraine

[4] Tech Hsch Koln Univ, Betzdorfer Str, D-50679 Cologne, Germany

[5] Drohobych Ivan Franko State Pedag Univ, 24 I Franko Str, UA-82100 Drogobych, Ukraine

来源：

CHEMICAL PHYSICS | 2018年 / 501卷

关键词：

Electrical relaxation; Spinel; Ceramics; Kinetics; Stretched-exponential; Compressed-exponential; PROTEIN MODEL; RELAXATION; TRANSFORMATIONS; ELECTROCERAMICS; MIGRATION; CERAMICS; DYNAMICS; GLASSES;

D O I：

10.1016/j.chemphys.2017.12.020

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Thermally-induced (170 degrees C) degradation-relaxation kinetics is examined in screen-printed structures composed of spinel Cu0.1Ni0.1Co1.6Mn1.2O4 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 behavior with similar to 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 similar to 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. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：121 / 127

页数：7

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