Analytical Description of Degradation-Relaxation Transformations in Nanoinhomogeneous Spinel Ceramics

• Published in: Nanoscale research letters Vol. 11; no. 1; pp. 499 - 6
• Main Authors: Shpotyuk, O., Brunner, M., Hadzaman, I., Balitska, V., Klym, H.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.12.2016; Springer Nature B.V
• Subjects: Alloys; Ceramics; Chemistry and Materials Science; Degradation; Diffusion; Materials Science; Mathematical models; Molecular Medicine; Nano Express; Nanochemistry; Nanoscale Science and Technology; Nanostructure; Nanotechnology; Nanotechnology and Microengineering; Nanotechnology and Nanomaterials 2016; Silver base alloys; Spinel; Relaxation; Stretched-exponential; Kinetics; Spinel; Nanoinhomogeneity; Compressed exponential
• ISSN: 1931-7573; 1556-276X
• DOI: 10.1186/s11671-016-1722-0

Mathematical models of degradation-relaxation kinetics are considered for jammed thick-film systems composed of screen-printed spinel Cu 0.1 Ni 0.1 Co 1.6 Mn 1.2 O 4 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 °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.