Analytical Description of Degradation-Relaxation Transformations in Nanoinhomogeneous Spinel Ceramics

作者：Shpotyuk O; Brunner M; Hadzaman I; Balitska V; Klym H

来源：Nanoscale Research Letters, 2016, 11(1): 499.

DOI：10.1186/s11671-016-1722-0

• Nanoinhomogeneity
• Relaxation
• Stretched-exponential
• Compressed exponential
• Kinetics
• Spinel

Mathematical models of degradation-relaxation kinetics are considered for jammed thick-film systems composed of screen-printed spinel Cu0.1Ni0.1Co1.6Mn1.2O4 and conductive Ag or Ag-Pd alloys. Structurally intrinsic nanoinhomogeneous ceramics due to Ag and Ag-Pd diffusing agents embedded in a spinel phase environment are shown to define governing kinetics of thermally induced degradation under 170 degrees C obeying an obvious non-exponential behavior in a negative relative resistance drift. The characteristic stretched-to-compressed exponential crossover is detected for degradation-relaxation kinetics in thick-film systems with conductive contacts made of Ag-Pd and Ag alloys. Under essential migration of a conductive phase, Ag penetrates thick-film spinel ceramics via a considerable two-step diffusing process.

• 出版日期2016-11-14