Aisha Soliman | Ain Shams University (original) (raw)

Papers by Aisha Soliman

Series of (100-x) Li2B4O7•xCuO glass samples was studied with the help of XRD, DTA, glass forming... more Series of (100-x) Li2B4O7•xCuO glass samples was studied with the help of XRD, DTA, glass forming ability (GFA), glass stability (GS) and density measurements. In the x  0–40 range the mol% increased by step of 5 mol%. The XRD pattern of the investigated glass samples containing CuO up to 25 mol% showed that these glass samples are composed the glassy phase, and the partial crystallization occurred above it. The crystalline phase was identified as Cuprite Cu2O. The calculations and the investigations used here enable us to evaluate the effect of copper addition to Li2B4O7 glass samples on GFA and GS and to find a possible correlation between them. The substitution of copper oxide at the expense of Li2B4O7 for the glass former causes the change in the values of Tg, Tx and Tl of the samples. The values of Tg for glass samples containing CuO up to 25 mol% are apparently lower than that in Li2B4O7 samples free from CuO. This means that the substitution of CuO tends to extend the glass-...

Physics and Chemistry of Glasses

Glasses with composition 90 mol% Li2B4O7–10 mol% Nb2O5 doped with TM (where TM=V2O5, MnO2, Co3O4 ... more Glasses with composition 90 mol% Li2B4O7–10 mol% Nb2O5 doped with TM (where TM=V2O5, MnO2, Co3O4 and CuO) have been prepared using the normal melt quench technique. We have used DTA and XRD and studied density, magnetic susceptibility and optical absorption to explore the influence of transition metal (TM) oxide valance state and coordination with oxygen on the glass properties. The quenched sample was heat treated at 620°C for 5 h. In the sample free from transition metal lithium niobate (LiNbO3) and lithium tetraborate (Li2B4O7) were the main phases in addition to traces of LiNb3O8. With TM additions to the glasses, LiNb3O8 increases and LiNbO3 decreases. DTA indicated that the activation energy of crystallization increases with increasing atomic number but reaches a minimum value at manganese. The activation energy of glass samples containing manganese has a minimum value due to this sample containing a lower quantity of Li2B4O7 and LiNb3O8. The analysis of the results of magneti...

Glass samples with the molecular formula (mol%): (30+x) SiO2–(10–x)B2O3–5Al2O3–54Na2O–1MnO2 where... more Glass samples with the molecular formula (mol%): (30+x) SiO2–(10–x)B2O3–5Al2O3–54Na2O–1MnO2 where x=0, 5, 7·5 and 10 mol% were prepared. The density, glass forming ability, fragility, Vickers hardness and magnetic susceptibility were measured and the results were used to investigate the changes caused by the replacement of boron oxide by silicon oxide. It was found that the density, glass forming ability, fragility and Vickers hardness at first increase at 5 mol% B2O3 (35 mol% SiO2) and then decrease at 2·5 mol% B2O3 (37·5 mol% SiO2) and increase again with increasing SiO2. The replacement of B2O3 by SiO2 increases the concentration of nonbridging oxygens and changes the ratio between BO4 and BO3. The higher density, glass forming ability and fragility of the sample containing 5 mol% B2O3 is due to the ratio between B2O3 and Al2O3 which equals 1, causing BO3 to change to BO4. The magnetic susceptibility increases as the silicon oxide content increases up to 37·5 mol% and then decrea...

... Review B 9 (1974) 1052. [6] Raman T., Rao GN, and Chakravort D.: J. Non-Cryst. Solids ~9 (197... more ... Review B 9 (1974) 1052. [6] Raman T., Rao GN, and Chakravort D.: J. Non-Cryst. Solids ~9 (1978) 85. [7] Sekhan SS and Kamel R.: J. Non-Cryst. Solids ~8 (1978) 189. [8] Kashif ]., Gomaa S.Sh., Mostah AG, Hamad SM, and Sanad AM: Phys. Chem. Glasses ~9 (1988) 72. ...

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2013

Glasses of various compositions in the system 90 Li2B4O7-10 Nb2O5 mixed with T.M ions (where T.M ... more Glasses of various compositions in the system 90 Li2B4O7-10 Nb2O5 mixed with T.M ions (where T.M is the transition metal) were prepared by quenching technique. Heat-treatment of the parent glasses was performed at 540, 570 and 620 °C, for 5 and 16 h. The glass structure evolution during the controlled crystallization was examined by XRD and FT-IR spectroscopy analysis. The crystalline phases present in the glass ceramics were identified via X-ray diffraction as a function of heat treatment. The FT-IR data propose for these glasses and heat-treated glass network structures mainly built by: di-, tri-, tetra-, penta-and ortho-borate groups. It was found that the quantitative evolution of these various borate species in the glass structures is influenced by the transition metal. A detailed discussion relating to the N4 evolution with the T.M content was made.

Physica B: Condensed Matter, 2010

Phase Transitions, 2012

ABSTRACT The glass composition (90 mol% Li2B4O7–10 mol% Nb2O5) was prepared by the melt quenching... more ABSTRACT The glass composition (90 mol% Li2B4O7–10 mol% Nb2O5) was prepared by the melt quenching technique. The quenched sample was heat treated at 480°C, 545°C and 630°C for 5 h and heat treated at 780°C with different time. The times were 5, 10, 15, 20, 28, and 36 h. The glass and glass ceramics were studied by differential thermal analysis (DTA), X-ray diffraction (XRD), and dc conductivity as a function of temperature. Lithium niobate (LiNbO3) and lithium diborate (Li2B4O7) were the main phases in glass ceramic addition to traces from LiNb3O8. Crystallite size of the main phases determined from the X-ray diffraction peaks are in the range

Phase Transitions, 2010

... View all references,22. Krishna Mohan, N, Rami Reddy, M, Jayasankar, CK and Veeraiah, N. 2008... more ... View all references,22. Krishna Mohan, N, Rami Reddy, M, Jayasankar, CK and Veeraiah, N. 2008. ... Depending on manganese concentrations, both Mn 2+ and Mn 3+ species were present 33. Soliman, AA, Sakr, EM, Ratep, A and Kashif, I. Role of manganese on glass forming ...

Materials Science and Engineering: B, 1996

... H. Farouk a , Aisha A. Solimani b , SA Aly a , H. Zahr El-Deen a , I. Kashif a , Correspondin... more ... H. Farouk a , Aisha A. Solimani b , SA Aly a , H. Zahr El-Deen a , I. Kashif a , Corresponding Author Contact Information and AM Sanad a. ... Ceram. Soc. 52 (1969), p. 11. Z. Abd El-Hadi, FA Moustaffa, KR El-Badry and AL Hussein, Glass Ceram. Bull. 30 (1983), p. 2. Chap. 5T. ...

Journal of Physics and Chemistry of Solids, 2006

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... 1 Comprehensive Studies of the Manganese Effect on Various Physical and Thermal Properties of... more ... 1 Comprehensive Studies of the Manganese Effect on Various Physical and Thermal Properties of Sodium Aluminum-Silicate Glasses Containing Sulfur AA Soliman, I. Kashif,* EM Sakr and A. Ratep ... It could notes that our previous work Soliman et al. ...

Journal of Alloys and Compounds, 2012

Journal of Alloys and Compounds, 2009

Physics and Chemistry of …, 2011

... thermal properties of sodium aluminosilicate glasses AA Soliman, EM Sakr, A. Ratep & ... more ... thermal properties of sodium aluminosilicate glasses AA Soliman, EM Sakr, A. Ratep & I. Kashif* Physics Department, Faculty of Girls, Ain Shams University, Heliopolis, Cairo, Egypt *Physics Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt ...

Armenian Journal of …, 2010

... 3, issue 3, pp. 218-235 ROLE OF MANGANESE ON GLASS FORMING ABILITY, HARDNESS, FRAGILITY, GLAS... more ... 3, issue 3, pp. 218-235 ROLE OF MANGANESE ON GLASS FORMING ABILITY, HARDNESS, FRAGILITY, GLASS ACTIVATION ENERGY AND STABILITY OF SODIUM-ALUMINO-SILICATE GLASSES AA Soliman, EM Sakr, A. Ratep and I. Kashif* ...

Recently, soft ferrites are most versatile due to their technological applications, especially pr... more Recently, soft ferrites are most versatile due to their technological applications, especially prepared by chemical methods [1]. Chemical methods as sol gel process provide high purity and homogeneity, uniform distribution of dopants ions at the molecular level and high efficiency [2]. Ni-Zn ferrites are known and have been applied in various the electrical and electronic industries, due to their interesting electrical and magnetic properties [3,4]. Nickel zinc ferrites as spinel-type structures, have a particular interest from the researchers much due to its using in various industrial electronic applications, such as communication devices (mobile phones), drug delivery, TVs, sensors, data storage, radios, microwaves,... etc. [4-6].The spinel structure name is offered due to its structure arrangement in which metal ions are distributed between (A site) tetrahedral and (B site) octahedral sites formed through the oxygen ions in a unit cell [7,8]. So, the distribution of metal ions t...