Articolul precedent |
Articolul urmator |
554 8 |
Ultima descărcare din IBN: 2023-09-11 01:32 |
SM ISO690:2012 ALEKBEROV, R., MEKHTIYEVA, S., ISAYEV, A., FABIAN, Margit, ALMASY, Laszlo, TIAN, Qiang. The local structure of As-Se-S and As-Se-Te chalcogenide glasses doped by samarium. In: Materials Science and Condensed Matter Physics, Ed. 8-th Edition, 12-16 septembrie 2016, Chişinău. Chişinău: Institutul de Fizică Aplicată, 2016, Editia 8, p. 231. ISBN 978-9975-9787-1-2. |
EXPORT metadate: Google Scholar Crossref CERIF DataCite Dublin Core |
Materials Science and Condensed Matter Physics Editia 8, 2016 |
|||||
Conferința "International Conference on Materials Science and Condensed Matter Physics" 8-th Edition, Chişinău, Moldova, 12-16 septembrie 2016 | |||||
|
|||||
Pag. 231-231 | |||||
|
|||||
Descarcă PDF | |||||
Rezumat | |||||
Recently to describe the structure of amorphous materials commonly is used fractal approach. In many materials, except substances in the gaseous or crystalline states, scale invariance can be found in certain range of sizes, i.e. the components of the structural elements in nano-metric scale (clusters, the pores and the interface between them) have a fractal nature [1]. In this work have been investigated the structural features of As33.3Se33.3S33.4and As33.3Se33.3Te33.4 systems in the nanometer scale and also the influence of change chemical composition and alloying with Sm on the basis of methods measuring of density and small-angle neutron scattering. It is shown that these materials have two-phase porous structure, i.e. materials outfit with solid particles and includes free volumes. For all samples the intensity of neutron scattering, beginning from the value of 6,8 ÷ 10-3 Å-1 transferred an impulse obeys a power law ̴ q-n and such dependence continues until the values of 0,2 ÷ 0,4 Å-1, where degree factor undergoes changes, as a result of variations in the chemical composition and doping by samarium. For the As33.3Se33.3S33.4 and As33.3Se33.3Te33.4executes the law Porod’s (n ≈ 4,12 ÷ 4,14) i.e. they do not have fractal nature.As a result, addition of samarium appears fractal nature in structures of indicated compounds. In this case, the degree factor of As33.3Se33.3S33.4 composition increases the value to 4,68 and for As33.3Se33.3Te33.4decreases to 3,85 which the first case corresponds to diffuse surface, but the second corresponds to two-phase porous structure, consisting of solid phases and pores with fractal surfaces the phase interface. |
|||||
|