title: Analytical Description of Degradation-Relaxation Transformations in Nanoinhomogeneous Spinel Ceramics.
abstract: Mathematical models of degradation-relaxation kinetics are considered for jammed thick-film systems composed of screen-printed spinel Cu0.1Ni0.1Co1.6Mn1.2O4and 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.
authors.affiliation: Jan Dlugosz University in Czestochowa, 13/15, Armii Krajowej str., 42200, Czestochowa, Poland. olehshpotyuk@yahoo.com.|Vlokh Institute of Physical Optics, 23, Dragomanov str., Lviv, 79005, Ukraine. olehshpotyuk@yahoo.com.
authors.forename: O
authors.initials: O
authors.lastname: Shpotyuk
authors.affiliation: Technische Hochschule Köln/University of Technology, Arts, Sciences, 2, Betzdorfer Strasse, Köln, 50679, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Brunner
authors.affiliation: Drohobych Ivan Franko State Pedagogical University, 24, I. Franko str., Drohobych, 82100, Ukraine.
authors.forename: I
authors.initials: I
authors.lastname: Hadzaman
authors.affiliation: Lviv State University of Life Safety, 35, Kleparivska str., Lviv, 79007, Ukraine.
authors.forename: V
authors.initials: V
authors.lastname: Balitska
authors.affiliation: Lviv Polytechnic National University, 12, Bandera str., Lviv, 79013, Ukraine.
authors.forename: H
authors.initials: H
authors.lastname: Klym
keywords: Compressed exponential; Kinetics; Nanoinhomogeneity; Relaxation; Spinel; Stretched-exponential