Temperature Dependent Ac Electric Conduction Of Polymer-Derived Sialcn Ceramics

Keywords

Conductive mechanism; Electric modulus; Polymer-derived SiAlCN ceramics; Temperature dependent electric conductivity

Abstract

The polymer-derived SiAlCN ceramic was synthesized by thermal decomposition of an Al-containing polymeric precursor at 1000 °C. The impedance spectra of the ceramic were measured in the frequency range of 20 Hz to 20 MHz at temperatures up to 500 °C. The results show that the conductivity of the material increases gradually with increasing testing temperature and frequency, which behaves a typical NTC characteristic. The overlapping of normalized peaks/lines corresponding to electric modulus/electric conductivity indicates that the material follows an identical conductive mechanism regardless of frequency in the temperature range. The results also reveal that the conductivity followed T−1/4 dependence, corresponding to a 3D hopping process. Analysis of the relationship between σ0 vs T0 reveals that the conductive mechanism is band-tail hopping rather than variable range hopping.

Publication Date

5-1-2018

Publication Title

Ceramics International

Volume

44

Issue

7

Number of Pages

8461-8466

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.ceramint.2018.02.043

Socpus ID

85041658684 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85041658684

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