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Electric magnetic study of organic inorganic hybrid semiconductors and manganites perovskites / Ahmed Kamel Mohamed Hassan Tammam ; Supervised Mohga F. Mostafa , Samy S. Ata Allah

By: Contributor(s): Material type: TextTextLanguage: English Publication details: Cairo : Ahmed Kamel Mohamed Hassan Tammam , 2015Description: 251 P. : charts ; 25cmOther title:
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Dissertation note: Thesis (Ph.D.) - Cairo University - Faculty of Science - Department of Physics Summary: The magnetic and transport properties of three types of polycrystalline materials having perovskite structure are investigated. The first group is concerned with single organic-inorganic hybrids of [(CH₂) (NH₃)₂] FeCl₄, n = 4 and 6 and their parent salts [(CH₂) (NH₃)₂] Cl₂, n = 4 and 6. The effect of Zn- doping of [(CH₂)₆(NH₃)₂] FexZn₁-xCl₄; x = (0.3, 0.5, 0.6, 0.7 and 0.8) on electric and magnetic properties are studied. Powder x-ray diffraction, thermal analysis, ac- conductivity and dielectric measurements of the organic inorganic hybrids (OIHs) were performed at low and high temperatures. Comparison of the magnetic, electrical and structural phase transitions of [(CH₂) (NH₃)₂] FeCl₄, n = 4 and 6 and the Zn doped hybrids are presented. Dielectric constant as well as electric conductivity as related to structure transitions and the effect of doping on the phase changes of [(CH₂)₆(NH₃)₂] FexZn₁₋xCl₄ are discussed. Ac magnetic susceptibility measurements at low temperatures for the Fe - Zn diluted samples indicated spin canted anitferromagnetic interaction for the diluted samples. It shows a shift of the transition temperature as Zn concentration increases in accordance with percolation theory. Another interesting sample of biological and technological importance is the luminescent substituted phosphonium MnBr hybrid, namely [(CH₃) (C₆H₅)₃P]₂. MnBr which is found to be ferroelectric with curie temperature 309.5 K. Structure, magnetic, thermal, dielectric and conductivity of this ferroelectric bi- organic inorganic hybrid is presented
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Thesis Thesis قاعة الرسائل الجامعية - الدور الاول المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.12.20.Ph.D.2015.Ah.E (Browse shelf(Opens below)) Not for loan 01010110068945000
CD - Rom CD - Rom مخـــزن الرســائل الجـــامعية - البدروم المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.12.20.Ph.D.2015.Ah.E (Browse shelf(Opens below)) 68945.CD Not for loan 01020110068945000

Thesis (Ph.D.) - Cairo University - Faculty of Science - Department of Physics

The magnetic and transport properties of three types of polycrystalline materials having perovskite structure are investigated. The first group is concerned with single organic-inorganic hybrids of [(CH₂) (NH₃)₂] FeCl₄, n = 4 and 6 and their parent salts [(CH₂) (NH₃)₂] Cl₂, n = 4 and 6. The effect of Zn- doping of [(CH₂)₆(NH₃)₂] FexZn₁-xCl₄; x = (0.3, 0.5, 0.6, 0.7 and 0.8) on electric and magnetic properties are studied. Powder x-ray diffraction, thermal analysis, ac- conductivity and dielectric measurements of the organic inorganic hybrids (OIHs) were performed at low and high temperatures. Comparison of the magnetic, electrical and structural phase transitions of [(CH₂) (NH₃)₂] FeCl₄, n = 4 and 6 and the Zn doped hybrids are presented. Dielectric constant as well as electric conductivity as related to structure transitions and the effect of doping on the phase changes of [(CH₂)₆(NH₃)₂] FexZn₁₋xCl₄ are discussed. Ac magnetic susceptibility measurements at low temperatures for the Fe - Zn diluted samples indicated spin canted anitferromagnetic interaction for the diluted samples. It shows a shift of the transition temperature as Zn concentration increases in accordance with percolation theory. Another interesting sample of biological and technological importance is the luminescent substituted phosphonium MnBr hybrid, namely [(CH₃) (C₆H₅)₃P]₂. MnBr which is found to be ferroelectric with curie temperature 309.5 K. Structure, magnetic, thermal, dielectric and conductivity of this ferroelectric bi- organic inorganic hybrid is presented

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