Publications

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1999
Badr, Y., Z. I. Ali, and R. M. Khafagy, "UV laser induced fluorescence of unirradiated and irradiated low density polyethylene", Journal of Photochemistry and Photobiology A: Chemistry, vol. 124, no. 1-2, pp. 35-40, 1999. AbstractWebsite
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1995
Gaffar, M. A., Y. A. Badr, and A. M. Mebed, "Effect of doping on the structural changes associated with the high temperature phase transition of LiNH4SO4 crystals", physica status solidi (a), vol. 148, no. 1, pp. 143-152, 1995. AbstractWebsite
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1990
Tomaszewski, P. E., "Comments on the “effect of γ-radiation on the phase transition temperature of Li0.5(NH4)0.5SO4” by Badr and El-Guiziri", Journal of Physics and Chemistry of Solids, vol. 51, no. 12, pp. 1433 -, 1990. AbstractWebsite
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Badr, Y. A., and S. B. El-Guiziri, "IR and DTA studies of high-temperature phase transition in lithium-ammonium sulphate", Journal of Physics and Chemistry of Solids, vol. 51, no. 5, pp. 421-423, 1990. AbstractWebsite
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1989
Badr, Y. A., S. B. El‐Giziri, T. M. Hammad, and P. E. Tomaszewski, "Comment on the Paper “On the Effect of Doping on the Mechanism of Phase Transition of Some Inorganic Compounds”", physica status solidi (a), vol. 112, no. 1, pp. K13-K14, 1989. AbstractWebsite
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Badr, Y. A., and S. B. El-Guiziri, "Effect of γ-radiation on the phase transition temperature of Li0.5(NH4)0.5SO4", Journal of Physics and Chemistry of Solids, vol. 50, no. 12, pp. 1261 - 1264, 1989. AbstractWebsite

Polycrystalline lithium-ammonium sulphate samples were subjected to X-ray diffraction analysis for determining the lattice parameters of the prepared mixed crystals. The compositions of the samples were determined using X-ray microanalysis. The Li0.5(NH4)0.5SO4 samples were irradiated with different doses of γ-radiation in order to investigate the effect of this ionizing radiation on the phase transition temperatures Tc1 and Tc2. The temperature dependence of the d.c. resistivity ρd.c. and dielectric constant ϵ of irradiated samples showed (i) a shift of Tc1 to higher temperatures; (ii) a shift of Tc2 to lower temperatures; and (iii) the appearance of a new anomaly near 128°C at moderately high γ-doses. The mechanisms giving rise to this behaviour are discussed.

Badr, Y. A., and S. B. El-Guiziri, "Effect of γ-radiation on the phase transition temperature of Li0.5(NH4)0.5SO4", Journal of Physics and Chemistry of Solids, vol. 50, no. 12, pp. 1261 - 1264, 1989. AbstractWebsite

Polycrystalline lithium-ammonium sulphate samples were subjected to X-ray diffraction analysis for determining the lattice parameters of the prepared mixed crystals. The compositions of the samples were determined using X-ray microanalysis. The Li0.5(NH4)0.5SO4 samples were irradiated with different doses of γ-radiation in order to investigate the effect of this ionizing radiation on the phase transition temperatures Tc1 and Tc2. The temperature dependence of the d.c. resistivity ρd.c. and dielectric constant ϵ of irradiated samples showed (i) a shift of Tc1 to higher temperatures; (ii) a shift of Tc2 to lower temperatures; and (iii) the appearance of a new anomaly near 128°C at moderately high γ-doses. The mechanisms giving rise to this behaviour are discussed.

Badr, Y. A., and S. B. El-Guiziri, "Effect of γ-radiation on the phase transition temperature of Li0.5(NH4)0.5SO4", Journal of Physics and Chemistry of Solids, vol. 50, no. 12, pp. 1261-1264, 1989. AbstractWebsite
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El‐Kabbany, F., Y. Badr, S. Taha, and M. Tosson, "A Study of the Phase Transition in the System [Ag1−x(Na)x]NO3by Infrared Spectroscopy", Annalen der Physik, vol. 501, no. 5, pp. 355-366, 1989. AbstractWebsite
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1987
El-Kabbany, F., Y. Badr, G. Said, and S. Taha, "Ferroelectricity associated with the metastable phase "III" of AgNO3", Applied Physics A Solids and Surfaces, vol. 43, no. 1, pp. 65-70, 1987. AbstractWebsite
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Badr, Y. A., S. B. El‐Giziri, and T. M. Hammad, "On the effect of doping on the mechanism of phase transition of some ionic inorganic compounds", physica status solidi (a), vol. 100, no. 2, pp. 467-472, 1987. AbstractWebsite
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Ahmed, S., A. M. Shamah, R. Kamel, and Y. Badr, "Phase Transition in [(NH4)1−x Kx]2SO4 Crystals", physica status solidi (a), vol. 102, no. 2, pp. K81-K85, 1987. AbstractWebsite
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Shamah, A. M., S. Ahmed, R. Kamel, and Y. Badr, "Structural changes of ((NH4)1–xKx)2SO4 crystals", physica status solidi (a), vol. 100, no. 1, pp. 115-119, 1987. AbstractWebsite
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Ahmed, S., A. M. Shamah, R. Kamel, and Y. Badr, "Structural changes of (NH4)2SO4crystals", physica status solidi (a), vol. 99, no. 1, pp. 131-140, 1987. AbstractWebsite
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El‐Kabbany, F., Y. Badr, G. Said, S. Taha, and S. Mahrous, "A Study of the Thermal Hysteresis in AgNO3", Annalen der Physik, vol. 499, no. 8, pp. 575-583, 1987. AbstractWebsite
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1986
El‐Kabbany, E., Y. Badr, M. Tosson, S. Taha, and S. Mahrous, "A Detailed IR Study of the Order‐Disorder Phase Transition of AgNO3", physica status solidi (a), vol. 94, no. 1, pp. 35-43, 1986. AbstractWebsite
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Hammad, T., F. El‐Kabbany, and Y. Badr, "Ferroelectric and dielectric properties of thin NaNO2 layers", physica status solidi (a), vol. 95, no. 1, pp. 121-125, 1986. AbstractWebsite
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El‐Kabbany, F., Y. Badr, G. Said, and S. Taha, "Ferroelectricity Associated with the Metastable Phase III of AgNO3", physica status solidi (a), vol. 98, no. 1, pp. 117-125, 1986. AbstractWebsite
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El-Kabbany, F., N. H. Taher, Y. Badr, and S. Taha, "POLYMORPHISM IN POTASSIUM SULPHATE.", Applied physics communications, vol. 6, no. 4, pp. 313-323, 1986. AbstractWebsite
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Dessouki, A. M., Y. Badr, A. H. Zahran, A. Mousa, and M. Abo-Zeid, Some spectroscopic studies of cotton-g-styrene prepared by gamma irradiation, , 1986. AbstractWebsite
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Dessouki, A. M., Y. Badr, A. H. Zahran, A. Mousa, and M. Abo-Zeid, "SOME SPECTROSCOPIC STUDIES OF COTTON-G-STYRENE PREPARED BY gamma IRRADIATION.", Radiation Physics and Chemistry, vol. 27, no. 5, pp. 347-351, 1986. AbstractWebsite
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Dessouki, A. M., Y. Badr, A. H. Zahran, A. Mousa, and M. Abo-Zeid, "Some spectroscopic studies of cotton-G-styrene prepared by λ irradiation", International Journal of Radiation Applications and Instrumentation. Part, vol. 27, no. 5, pp. 347-351, 1986. AbstractWebsite
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El‐Kabbany, F., Y. Badr, G. Said, S. Taha, and S. Mahrous, "A study of the thermal hysteresis in AgNO3", physica status solidi (a), vol. 95, no. 1, pp. 127-134, 1986. AbstractWebsite
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1984
Badr, Y. A., and S. Awad, "On the low temperature phase transition in (NH4)2SO4", Journal of Physics and Chemistry of Solids, vol. 45, no. 3, pp. 351-353, 1984. AbstractWebsite
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1982
Badr, Y. A., and S. Awad, "On the Low Temperature Phase Transition in Ammonium Sulfate", physica status solidi (a), vol. 72, no. 1, pp. K27-K32, 1982. AbstractWebsite
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