Naslov
Synthesis and Characterization of some Clathrate Compounds

Autori
Stubičar, Mirko ; Stubičar, Nada ; Milinović, Andrijana ; Krumes, Dragomir ; Ivanda, Mile ; Žonja, Sanja ; Očko, Miroslav

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Knjiga sažetaka 7. znanstvenog sastanaka HFD-a / - , 2011

Skup
Znanstveni sastanak HFD-a (7 ; 2011)

Mjesto i datum
Primošten, Hrvatska, 13.10.2011. - 16.10.2011

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
hardness; clathrates; Raman spectrum

Sažetak
In the presented study we report on our work on the characterization of the plastic properties by means of Vickers microhardness measurements of some clathrate compounds prepared by arc melting: Ba₈Ag₅Si₄₁, Ba₈Au₅Si₄₁ and Ba₈Au₆Ge₄₀. The results cannot be explained by taking into account the usual comparison of microhardness with the size of atoms, the density of compounds, the melting temperatures, and by the coefficient of temperature expansion of the compounds. In order to understand the microhardness of the investigated compounds one have to take into account the strength of the Si-Si with respect to the Ge-Ge bonds. But it seems that a full explanation one can get analyzing the Raman spectra from these samples. The analyse indicates the existance of precipitates of Si in the samples containing Si within chlatrate formula. It is known that small sized precipitates hamper and omit moving of dislocations. Therewith the hardness of a material increases.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Elektrotehnika

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