Effect of annealing on EPR spectra of Ti-Si-C-N samples

• Autorzy: Guskos N. , Anagnostakis E. A. , Zolnierkiewicz G. , Typek J. , Biedunkiewicz A. , Guskos A. , Berczynski P.
• Języki publikacji: EN

Abstrakty

EN

Two nanocrystalline samples of TiC+SiC+20%C (sample 1) and Si3N4+Si(C,N)+Ti(C,N)+1%C (sample 2) were prepared by non-hydrolytic sol-gel method. The latter sample was produced from sample 1, by subjecting it to additional annealing at high temperature. XRD measurements showed the presence of aggregates of cubic SiC+TiC nanoparticles (10 to 30 nm in size). In both samples, a very narrow electron paramagnetic resonance (EPR) line originating from localized magnetic centers was centered at geff2. At T = 130 K, we registered the linewidths DHpp = 1.41(2) G and DHpp = 2.92(2) G for the sample without and with thermal annealing, respectively. For the non-annealed sample, the resonance line was fitted by a Lorentzian line in the low temperature range, and by a Dysonian line above 70 K, which indicates a significant change in electrical conductivity. Therefore, thermal annealing can significantly improve the transport properties of samples. An analysis of the temperature dependence of the EPR parameters (g-factor, linewidth, integrated intensity) showed that thermal annealing has a significant impact on the reorientation processes of localized magnetic centers.

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2012
• Tom: Vol. 30, No. 1
• Strony: 23--31
• Opis fizyczny: Bibliogr. 40 poz.

Twórcy

autor

Guskos N.

autor

Anagnostakis E. A.

autor

Zolnierkiewicz G.

autor

Typek J.

autor

Biedunkiewicz A.

autor

Guskos A.

autor

Berczynski P.

• Department of Solid State Physics, School of Physics, Faculty of Sciences, University of Athens, Panepistimiopolis, 15 784 Zografos, Athens, Greece

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