Search results

Sort By:

Limit search:

Pulsed EPR and ENDOR Study of SiC Nanopowders

100%

Savchenko D.

Acta Physica Polonica A

2014

vol. 126

issue 5

1063-1065

In this work field-sweep electron spin echo and pulsed electron nuclear double resonance study of the silicon carbide (SiC) nanoparticles (np-SiC) of different sizes is presented. Nitrogen (N) triplet lines due to the isolated N donor state was observed in np-SiC with grain size d>100 nm. With a decrease of the particle size up to 50 nm the N triplet lines transforms into one single exchange line due to the delocalization of the donor wave function caused by the size confinement effect. Along with N donors the carbon vacancy (V_{C}) located in cubic phase was observed in np-SiC with d < 100 nm. The further decrease of the grain size to d < 50 nm leads to the appearance of the V_{C} located in hexagonal crystalline phase and carbon dangling bonds located in the carbon excess phase of np-SiC. The fact that only N donor center at "k2" quasi-cubic position substituting Si site was observed in the field-sweep electron spin echo and pulsed electron nuclear double resonance spectra of np-SiC was explained by high compensation degree of the samples and the presence of carbon excess in np-SiC. The appearance of the proton electron nuclear double resonance signal in no-SiC with d < 100 nm indicates that the hydrogen retention in np-SiC increases with decreasing of grain size.

Refine search results

1 Acta Physica Polonica A

1 2014

1 Savchenko D.

Search results

Pulsed EPR and ENDOR Study of SiC Nanopowders