Production Of Nanoparticles Of AgAsSe2 and Ag3AsSe3 Compounds

Authors : Turac SULEYMANOVA

Pages : 103-110

Doi:10.18596/jotcsa.315648

View : 9 | Download : 12

Publication Date : 2017-07-13

Article Type : Research Paper

Abstract :     Ternary compounds insert ignore into journalissuearticles values(nano- and microparticles); of AgAsSe 2 and Ag 3 AsSe 3 have been synthesized from approximately equimolar mixtures of silver nitrate, sodium metaarsenite and sodium selenosulfate with prepared by refluxing selen powder with concentrated sodium sulfite solution under hydrothermal conditions in ethylene glycol medium. The solutions were put into a 100 mL Teflon-lined stainless steel autoclave Speedwave four BERGHOF and sealed and then heated at the temperature of 443 K during 8 hours insert ignore into journalissuearticles values(pH = 5-4);. The products were filtered via the glass filter and washed by deionized water and absolute ethanol for several times, then dried at 353 K in vacuum oven for at least 1 hour for analysis. The thermogravimetric insert ignore into journalissuearticles values(TG); and electron microprobe analysis have been carried out. The results showed that the composition of silver selenoarsenates compounds corresponding to the formule AgAsSe 2 and Ag 3 AsSe 3 . The results of SEM image and shows the typical morphologies of synthesized products in which tubular and stick shaped like nano-particles can be observed and their size can be estimated from 140 nm to 310 nm. The compound of AgAsSe 2 and Ag 3 AsSe 3 was constructed using X-ray phase and differential-thermal analyses. It is ascertained by X-ray powder diffraction insert ignore into journalissuearticles values(XRD); that the parameters of AgAsSe 2 crystallized in the tetragonal space group R3 - m with a = 12.54 Å, c = 11.14 Å , α = 90 0 , β = 90 0 ,γ = 90 0 , Z = 5, Ag 3 AsSe 3 insert ignore into journalissuearticles values(this compound is an allotrope of   β -Ag 3 AsSe 3 );  crystallizes in the orthorhombic space group Pnma , a = 8.11 Å , b = 11.34 Å , c = 20.73 Å , α = 90 0 , β = 90 0 ,γ = 90 0 , Z = 8. The results of d ifferential thermal analysis insert ignore into journalissuearticles values(DTA); AgAsSe 2 compound is melting congruently at T g = 683 K , Ag 3 AsSe 3 with incongruent type of melting at T g = 663 K was established. 
Keywords : hydrothermal synthesis, organic solvent, arsenic III, selenide, XRD, scanning electron microscopy