The effect of composition on structural and optical properties of ZnSealloys

Research Abstract
Bulk ofZnxSe100x (x¼10, 20and40at%)waspreparedbytheusualquenchmelttechnique.Thinfilms of thesecompositionswerepreparedbythermalevaporation.Differentialthermalanalyses(DTA)on powder samplesundernon-isothermalconditionsshowthattheglasstransitiontemperature Tg increasedandcrystallizationtemperature Tp decreasedwithincreasingZncontent.Theaverageparticle size ofthecrystallineZnSephasededucedfromX-raydiffraction(XRD)patternsshowadecreasewith increasingZncontent.Theseresultswereconfirmedwiththeresultsobtainedbyscanningelectron microscopy(SEM). The opticalpropertiesofZnxSe100x have beenstudiedatawavelengthrange(300–900nm),andit was foundthattheopticalbandgap(Eg) increaseswithincreasingZnconcentrationintheZnxSe100x system. TheresultscanbeinterpretedonthebasisofthechemicalbondapproachproposedbyBicermo and Ovshinsky.Thevalueoftheextinctioncoefficient(k) decreaseswithincreasingwavelengthandZn content. On theotherhand,theopticalenergygap(Eg) decreasedwithincreasingtheannealingtemperature for Zn10Se90 thin films.TheseresultscanbeinterpretedbytheDavisandMottemodel.
Research Authors
M.A. Abdel-Rahim , M.M.Hafiz , A.Elwhab.B.Alwany
Research Department
Department of physics
Research Journal
Optics & Laser Technology
Research Member
Mohamed Mahmoud Hafiz Mohamed
Research Pages
PP.88–94
Research Rank
1
Research Vol
Vol.47
Research Year
2013

The effect of composition on structural and optical properties of ZnSealloys

Research Abstract
Bulk ofZnxSe100x (x¼10, 20and40at%)waspreparedbytheusualquenchmelttechnique.Thinfilms of thesecompositionswerepreparedbythermalevaporation.Differentialthermalanalyses(DTA)on powder samplesundernon-isothermalconditionsshowthattheglasstransitiontemperature Tg increasedandcrystallizationtemperature Tp decreasedwithincreasingZncontent.Theaverageparticle size ofthecrystallineZnSephasededucedfromX-raydiffraction(XRD)patternsshowadecreasewith increasingZncontent.Theseresultswereconfirmedwiththeresultsobtainedbyscanningelectron microscopy(SEM). The opticalpropertiesofZnxSe100x have beenstudiedatawavelengthrange(300–900nm),andit was foundthattheopticalbandgap(Eg) increaseswithincreasingZnconcentrationintheZnxSe100x system. TheresultscanbeinterpretedonthebasisofthechemicalbondapproachproposedbyBicermo and Ovshinsky.Thevalueoftheextinctioncoefficient(k) decreaseswithincreasingwavelengthandZn content. On theotherhand,theopticalenergygap(Eg) decreasedwithincreasingtheannealingtemperature for Zn10Se90 thin films.TheseresultscanbeinterpretedbytheDavisandMottemodel.
Research Authors
M.A. Abdel-Rahim , M.M.Hafiz , A.Elwhab.B.Alwany
Research Department
Department of physics
Research Journal
Optics & Laser Technology
Research Member
Mostafa Abdel-Naiem Rahim Hussein
Research Pages
PP.88–94
Research Rank
1
Research Vol
Vol.47
Research Year
2013

Assessment of Thermionic Emission Properties and Back Bombardment Effects for LaB6 and CeB6

Research Authors
Mahmoud Bakr, R. Kinjo, Y.W. Choi, M. Omer, K. Yoshida, K. Ishida, N. Kimura, T. Komai, M. Shibata, K. Shimahashi, H. Imon, T. Sonobe, H. Zen, M. Kawai, T. Kii, K. Masuda, and H. Ohgaki
Research Department
Department of physics
Research Journal
33rd Free Electron Laser Conference FEL Shanghai, China,
Research Member
Mahmoud Abdel Aziem Bakr Arby
Research Pages
4
Research Rank
3
Research Website
http://accelconf.web.cern.ch/accelconf/FEL2011/papers/thpa34.pdf
Research Year
2011

Comparison between Hexaboride Materials for Thermionic Cathode RF Gun

Research Authors
Mahmoud Bakr, K. Yoshida, S. Ueda, M. Takasaki, R. Kinjo, Y.W. Choi, H. Zen, T. Sonobe, T. Kii, K. Masuda, H. Ohgaki
Research Department
Department of physics
Research Journal
1st International Particle Accelerator Conference, Kyoto, Japan
Research Member
Mahmoud Abdel Aziem Bakr Arby
Research Pages
pp. 1782- 1784
Research Rank
3
Research Website
http://epaper.kek.jp/IPAC10/papers/tupec029.pdf
Research Year
2010

Analysis of Transient Response of RF Gun Cavity due to Back-Bombardment Effect in KU-FEL

Research Authors
Mahmoud Bakr, H. Zen, K. Yoshida, S. Ueda, M. Takasaki, K. Ishida, N. Kimura, R. Kinjo, Y. W. Choi, T. Sonobe, T. Kii, K. Masuda and H. Ohgaki
Research Department
Department of physics
Research Journal
Green Energy and Technology Book
Research Member
Mahmoud Abdel Aziem Bakr Arby
Research Pages
, p 193-200
Research Publisher
Springer
Research Rank
1
Research Website
http://link.springer.com/chapter/10.1007%2F978-4-431-53910-0_26
Research Year
2010

Comparison between the hexaboride materials as thermionic cathode in the RF guns for ‎a compact MIR-FEL driver

Research Authors
Mahmoud Bakr, K. Yoshida, K. Higashimura, S. Ueda, R. Kinjo, H. Zen, T. Sonobe, T. Kii, K. Masuda, ‎H. Ohgaki‎
Research Department
Department of physics
Research Journal
Green Energy and Technology Book,
Research Member
Mahmoud Abdel Aziem Bakr Arby
Research Pages
P- 202-210
Research Publisher
Springer
Research Rank
1
Research Website
http://link.springer.com/chapter/10.1007/978-4-431-99779-5_32
Research Year
2009

FEL Beamline for Wide Tunable Range and Sharing System at Kyoto University

Research Authors
Mahmoud Bakr, K. Yoshida, K. Higashimura, S. Ueda, R. Kinjo, H. Zen T. Sonobe, T. Kii, K. Masuda, H. ‎Ohgaki‎
Research Department
Department of physics
Research Journal
AIP,
Research Member
Mahmoud Abdel Aziem Bakr Arby
Research Pages
P 45~48
Research Rank
1
Research Vol
V. 1214, issue 1
Research Website
http://proceedings.aip.org/resource/2/apcpcs/1214/1/45_1
Research Year
2009

Back Bombardment for Dispenser and Lanthanum Hexaboride Cathodes

Research Authors
Mahmoud Bakr, R. Kinjo, Y. W. Choi, M. Omer, K. Yoshida, S. Ueda, M. Takasaki, K. Ishida, N. Kimura, T. Sonobe, T. Kii, K. Masuda, and H. Ohgaki
Research Department
Department of physics
Research Journal
J. Phys. Rev. STAB,
Research Member
Mahmoud Abdel Aziem Bakr Arby
Research Pages
14
Research Rank
1
Research Vol
14
Research Website
http://prst-ab.aps.org/abstract/PRSTAB/v14/i6/e060708
Research Year
2011
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