Impact of platinum doping on the structural, cation distribution, electrical and dielectric properties of CoZn nanospinel oxides
Materials Chemistry and Physics, vol.348, 2026 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 348
- Publication Date: 2026
- Doi Number: 10.1016/j.matchemphys.2025.131644
- Journal Name: Materials Chemistry and Physics
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Chimica, Compendex, INSPEC
- Keywords: Cation distribution, Cole-cole study, Conductivity, Dielectric properties, Nanospinel oxides
- Istanbul Gelisim University Affiliated: Yes
Abstract
This study explores the structural and electrochemical properties of Pt-doped cobalt–zinc nanospinel oxides (Co0·5Zn0·5Pt3xAl2-4xO4 NSOs, 0.00 ≤ x ≤ 0.10) synthesized via a sol–gel combustion route, with a focus on tunable electrical behavior for energy-related applications. Phase-pure spinel formation was confirmed by XRD, while SEM/EDX analyses verified nanoscale morphology and composition. Systematic investigation of frequency- and temperature-dependent conductivity, dielectric, and impedance responses revealed that moderate Pt substitution (x ≈ 0.02–0.06) significantly enhances charge mobility through defect-assisted transport, while higher substitution levels introduce additional relaxation phenomena and interfacial polarization. Modulus and Cole–Cole analyses confirmed a transition from Debye-to non-Debye-type relaxation, indicating a compositional control of grain and grain boundary contributions. These findings demonstrate that Pt doping provides a strategy for tuning electrical heterogeneity and dielectric response in CoZn–Al spinels, making them promising candidates for energy storage devices and sensing applications.