Almessiere M., Ünal B., Baykal A., Demir Korkmaz A., Shirsath S. E., Gondal M. A., ...Daha Fazla
MATERIALS CHEMISTRY AND PHYSICS, cilt.348, sa.2, ss.131644, 2026 (SCI-Expanded, Scopus)
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Yayın Türü:
Makale / Tam Makale
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Cilt numarası:
348
Sayı:
2
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Basım Tarihi:
2026
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Doi Numarası:
10.1016/j.matchemphys.2025.131644
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Dergi Adı:
MATERIALS CHEMISTRY AND PHYSICS
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Derginin Tarandığı İndeksler:
Scopus, Science Citation Index Expanded (SCI-EXPANDED), Chemical Abstracts Core, Chimica, Compendex, INSPEC
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Sayfa Sayıları:
ss.131644
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İstanbul Gelişim Üniversitesi Adresli:
Evet
Özet
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.