This paper presents for the first time the nanocrystalline, semiconducting ferroelectrics antimony sulfoiodide (SbSI) grown in multiwalled carbon nanotubes (CNTs). It was prepared sonochemically using elemental Sb, S and I in the presence of methanol under ultrasonic irradiation (35kHz, 2.6W/cm(2)) at 323K for 3h. The CNTs filled with SbSI were characterized by using techniques such as powder X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, high-resolution transmission electron microscopy, selected area electron diffraction, and optical diffuse reflection spectroscopy. These investigations exhibit that the SbSI filling the CNTs is single crystalline in nature and in the form of nanowires. It has indirect forbidden energy band gap E(gIf)=1.871(1)eV.
A novel sonochemical method for direct preparation of nanocrystalline antimony selenoiodide (SbSeI) has been established. The SbSeI gel was synthesized using elemental Sb, Se, and I in the presence of ethanol under ultrasonic irradiation (35 kHz, 2W/cm(2)) at 50 degrees C for 2h. The product was characterized by using techniques such as powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and optical diffuse reflection spectroscopy (DRS). The SEM and HRTEM investigations exhibit that the as-prepared samples are made up of large quantity nanowires with lateral dimensions of about 20-50 nm and lengths reaching up to several micrometers and single crystalline in nature.
The influence of the substitution of methanol in place of ethanol during the ultrasonic production of antimony sulfoiodide (SbSI) nanowires is presented. The new technology is faster and more efficient at temperatures greater than 314 K. The products were characterized by using techniques such as powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDXA), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), optical diffuse reflection spectroscopy (DRS) and IR spectroscopy. The coexistence of Pna2(1) (ferroelectric) and Pnam (paraelectric) phases at 298 K was observed in the SbSI nanowires produced in methanol. The methanol decomposes during the sonication or due to the adsorption process on SbSI nanowires.
The influence of pouring temperature on the microstructure, fluidity and mechanical properties of ZRE1 magnesium alloy was investigated in this paper. The pouring temperature influences on the fluidity, mean area of grain plane section and mechanical properties. The dependence between pouring temperature and volume fraction of the (Mg,Zn) 12 RE intermetallic phase was not observed. The investigations enabled to determine the optimal pouring temperature of ZRE1 alloy. Moreover, the microstructural stability of ZRE1 alloy during long-term annealing at 150• C, 200• C and 400• C was investigated. ZRE1 magnesium alloy possesses a high microstructural stability up to 200• C, whereas at 400 • C magnesium oxides and rare earth metals oxides are observed in the microstructure.Keywords: Magnesium alloy, ZRE1 alloy, fluidity, microstructure W pracy przedstawiono wyniki badań wpływu temperatury odlewania na mikrostrukturę, lejność i właściwości mechaniczne stopu magnezu ZRE1. Stwierdzono, że temperatura odlewania wpływa na lejność, średnie pole powierzchni płaskiego przekroju ziarna i właściwości mechaniczne stopu ZRE1. Nie zaobserwowano zależności pomiędzy temperaturą odlewania a udziałem objętościowym wydzieleń fazy międzymetalicznej (Mg,Zn) 12 RE. Przeprowadzone badania umożliwiły określenie najkorzystniejszej temperatury odlewania do form piaskowych dla stopu ZRE1. Przeprowadzono także badania stabilności strukturalnej podczas długotrwałego wygrzewania w temperaturze 150• C, 200• C i 400 • C. Stwierdzono, że do temperatury 200• C mikrostruktura jest stabilna, natomiast w temperaturze 400• C stop ZRE1 charakteryzuje się niską stabilnością i skłonnością do tworzenia tlenków magnezu i metali ziem rzadkich.
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