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Your search keyword '"Jalar, Azman"' showing total 18 results
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18 results on '"Jalar, Azman"'

14. The Relationship between XRD Peak Intensity and Mechanical Properties of Irradiated Lead-Free Solder

Author

Paulus, Wilfred, Rahman, Irman Abdul, Jalar, Azman, Othman, Norinsan Kamil, Ismail, Roslina, Wan Yusoff, Wan Yusmawati, and Abu Bakar, Maria

Abstract

The variation on mechanical properties and crystalline structure of gamma-irradiated Sn-rich lead-free solder (SAC) were intensively investigated using nanoindentation and X-ray diffraction (XRD) techniques. Samples of solder on a printed circuit board (PCB) with copper substrate were irradiated at low dose (5 Gray) of gamma from Co-60 source. The nanoindentation hardness for β-Sn phase of the solder was found to increase from 0.1935 GPa to 0.2210 GPa after the irradiation. Furthermore XRD peak intensity was also observed to increase as well indicating the occurrence of defect in β-Sn crystal structure due to gamma radiation. The defect contributes to the increment of the hardness by indicating the change in crystallite size of the grains. Microstructure analysis by FESEM-EDAX has also confirmed the indentation was performed with no cracks in subsurface on β-Sn area.

Published
2017
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18. Synthesis and Characterization of Grape-Like SnO2 Structures Grown by a Thermal Evaporation Method

Author

Lim, Kar Keng, Hamid, Muhammad Azmi Abd, Shamsudin, Roslinda, Jalar, Azman, and Al-Hardan, N.H.

Abstract

Grape-like tin dioxide (SnO2) structures have been grown on p-type silicon (Si(100)) substrate synthesized by thermal evaporation of tin (Sn) without use of metal catalyst. The experiment were conducted in a three-zone tube furnace at a constant temperature of 1080°C,under 1.6% of oxygen (O2) gas in an atmospheric ambient with a controlled flow rate of 1.0L/min. The prepared SnO2 film was characterized by using X-ray diffraction diffractometer (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy(EDX) and photoluminescence (PL) measurement. The grape-like SnO2 structures were highly crystalline with particle size (resemble grape fruit) ranging from 120-550 nm and diameter of wire (resemble grape stem) around 120-160 nm.The PL spectrum of the grape-like SnO2 structures exhibits a broad visible light emission with a peak centered at around 623 nm, corresponding to 1.99 eV and usual near band edge emission of SnO2 is not observed.

Published
2013
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