Production Of Nanoparticles Of AgAsSe2 and Ag3AsSe3 Compounds

Year 2017, Volume: 4 Issue: 1, 103 - 110, 13.07.2017

Turac Suleymanova

https://doi.org/10.18596/jotcsa.315648

Cited By: 2

Abstract

    Ternary
compounds (nano- and microparticles) of AgAsSe₂ and Ag₃AsSe₃
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 (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 (TG) and
electron microprobe analysis have been carried out. The results showed that the
composition of silver selenoarsenates
compounds corresponding to the formule AgAsSe₂ and Ag₃AsSe₃.
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 AgAsSe₂ and Ag₃AsSe₃ was constructed using
X-ray phase and differential-thermal analyses. It is ascertained by X-ray
powder diffraction (XRD) that the parameters of AgAsSe₂ crystallized in the tetragonal space group R3^-m
with a = 12.54 Å, c = 11.14 Å, α = 90⁰, β = 90⁰,γ = 90⁰,
Z = 5, Ag₃AsSe₃ (this compound is an allotrope of β-Ag₃AsSe₃) crystallizes
in the orthorhombic space group Pnma, a = 8.11 Å, b = 11.34 Å, c = 20.73 Å, α = 90⁰, β = 90⁰,γ
= 90⁰, Z = 8. The results of differential thermal analysis (DTA) AgAsSe₂
compound is melting congruently at T_g =
683 K,
Ag₃AsSe₃ with incongruent type of melting at T_g = 663 K was established. 

Keywords

hydrothermal synthesis, organic solvent, arsenic (III) selenide, XRD, scanning electron microscopy

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