Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : ray diffraction


Effect of Deposition Temperature on Optical and Crystallographic Properties of CsI Thick Films Deposited using Spray Pyrolysis

J.H. Khulaef

Engineering and Technology Journal, 2017, Volume 35, Issue 2, Pages 195-203

A deposited layer of CsI has been prepared at different substrate
temperatures using spray pyrolysis technique. The X Ray diffraction of CsI
films reveals special pattern peaks (110), (200), (211), (220), (310) and (321).
From transmission spectra we calculated the energy gap of CsI films which
increase with increasing deposition temperature for direct transition is
estimated.

Mechanical Performance of CO2 and Autoclave Cured Date Palm Fiber Reinforced eco-mortar Composites

Maan Salman Hassan; Wahad Marwan Salih

Engineering and Technology Journal, 2016, Volume 34, Issue 14, Pages 2754-2765

Using nature waste fibers in construction industries had shown important character "environmental friendly" which paid a great interest around the world. The aim of this paper was to investigate the suitability of agriculture waste date palm fibers as lignocellulosic materials for the production of wood-cement composite, in addition to enhance their compatibility with cement using accelerated curing like carbonation or autoclave.
Three percentages of date palm fibers were used (2, 6, and 10)% by weight of cement in cement composites specimens. Compressive, flexural and direct tension strengths were examined as strength properties and X-ray diffraction (XRD) as microstructure properties. The results show that carbonation curing was the most effective curing for compressive strength property while autoclave curing leads to better performance in flexural strengths. Curing type effects on direct tension property were fluctuated. This could be attributed to the variation in cellulose fiber roles with respect to each property evaluated. X-ray diffraction confirmed that CO2-curing led to increased CaCO3 content compared with autoclaved composites.

Synthesis and Specification of Superconductor Compound Tl2Ba2Can−1CunO2n+4+δ(n = 2, 3, 4)

Ali I.Al-Janabi; Natheer B. Mahmood; Yaser Issam Hamodi

Engineering and Technology Journal, 2015, Volume 33, Issue 9, Pages 1582-1590

High-temperature superconductor compound Tl2Ba2Can−1CunO2n+4+δ (n = 2, 3, 4) was prepared by solid-state reactionevacuated sealed tube method. The research was carried out to investigate the effect of parameter (n) on the superconductor behavior of the compound Tl2Ba2Can−1CunO2n+4+δ. The structural phase of prepared samples was analyzed by X-ray diffraction (XRD) analysis, and the results showed the demand phase depend on the parameter (n). The resistivity measurement by four-probe technique used to investigate the critical temperature. The parameter (n) has major effect on definition of critical temperature for superconductor compound. The results showed that the sample prepared with n = 2 has a critical temperature Tc= 102 K; meanwhile, the sample prepared with n = 4 has a critical temperature Tc= 99 K; however, the sample which was prepared with n = 3 has a maximum critical temperature Tc= 121 K. There is a match between the result of magnetic susceptibility and the resistivity measurements at n = 3.

Experimental and Simulation Study the Effect of Different Reduction Ratios in Cold Rolling Process on the Residual Stresses of AL 2024 Alloy

Samir Ali Amin Al-Rabii; Sadiq Jaffar Aziz; Ali Hussein Alwan

Engineering and Technology Journal, 2015, Volume 33, Issue 5, Pages 1049-1064

Cold forming processes are the common processes in sheet metal forming, especially in the final stages of production processes. In this work, cold rolling process was selected to study the effect of different reduction ratios on the residual stresses state in aluminum alloy (2024). Sheets of aluminum alloy (2024-T3) were prepared with dimensions (400 X 80 X 3.15 mm).The annealing process was conducted for these sheets to get the temper condition (2024-O). The cold rolling process was performed with different reduction ratios (10%, 20%, 30%, 40%, 50%, 60%) by a rolling machine composed of two rolls having (50 mm) diameter each.The residual stresses were measured using X-ray diffraction technique (XRD) in two directions (rolling direction RD, and transverse direction TD).The results of X-ray diffraction showed the presence of residual stresses at the surface of rolled specimens, and these were compressive stresses in the two tested directions (RD, and TD) at 10% reduction ratio. When the reduction ratio exceeded 10%, these stresses transformed to tensile stresses for specimens tested in rolling direction, while these stresses remained compressive type for all reduction ratios in transverse direction.Computer simulation was carried out using finite element method (FEM) by (ANSYS-LSDYNA 12.1) software to investigate the residual stresses behavior of AA 2024. The numerical results showed a good agreement with the experimental resultsespecially for samples tested in the rolling direction.

Studying The Effect of Annealing Temperature and Annealing Time on Physical Properties of Graphite

Ali M .Mousa; Samer Bahjit

Engineering and Technology Journal, 2012, Volume 30, Issue 17, Pages 355-359

Graphite electrodes prepared by using carbon black as a filler material and
phenolic resin as a binder. The samples treated thermally within temperature rang
of 750-950)c for two and three hours . the variation in electrical resistivity and
structural properties as a function of the two variables were studied . electrical
resistivity decreased with increasing treatment temperature and time. Increasing
temperature resulting in graphitization degree increasing ,also the inter atomic
distance comparing to the standard values decreased with increasing treatment
temperature and time of treatment.

Influence of Deposition Condition on the Properties of Chemically Deposited Cu2O Film

Abdal-Satar Kuther; Ali M. Mousa

Engineering and Technology Journal, 2010, Volume 28, Issue 19, Pages 5881-5892

Cuprous oxide films have been deposited by chemical bath method from
alkaline solution at pH=8.6.The deposited oxides were investigated using X-ray
diffraction, surface morphology, optical and electrical measurements. It is shown
that during deposition two different stages could be distinguished. the band gap of
the deposited film tuned from 2eV to 2.5 eV by decreasing deposition time. X-ray
diffraction (XRD) measurements showed formation of CuO and Cu2O phases, the
structure shows a thickness dependent. The grain size of as deposited and
annealed films at different temperatures were calculated from SEM data, The
results showed that the grain size of films increased with increasing deposition
time and annealing temperature. The resistivity of the films had significantly
decreased with increased deposition time, also films activation energy decreased
with increasing thickness

Preparation of HgI2 Films Using Solvent Evaporation

Gaafar M. Mousa

Engineering and Technology Journal, 2009, Volume 27, Issue 16, Pages 2885-2893

A deposited layer of HgI2 has been prepared by using the solution technique. This technique takes a long time about (10 days) to get a film. The deposition time in this work reduced to (24 hours). The film consist of 2.25 mm thick layer of HgI2.The band gap energy and type of optical transition were determined from transmission spectra, and an optical band gap of Eg =2.12 eV for direct transition was estimated. x-ray diffraction of HgI2 to film shows a preferential orientation of peaks (101) and (102).