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.

Results in Physics, 2012

The glass system (45Li 2 O + 45B 2 O 3 + 10Nb 2 O 5) was fabricated by the conventional melt quen... more The glass system (45Li 2 O + 45B 2 O 3 + 10Nb 2 O 5) was fabricated by the conventional melt quenching technique poured in water, at air, between two hot plates and droplets at the cooled surface. The glass and glass ceramics were studied by differential thermal analysis (DTA) and X-ray diffraction (XRD). The as quenched samples poured in water and between two hot plates were amorphous. The samples poured at air and on cooled surface were crystalline as established via X-ray powder diffraction (XRD) studies. Differential thermal analysis was measured. The glass transition temperature (T g) and the crystallization temperatures were calculated. Lithium niobate (LiNbO 3) was the main phase in glass ceramic poured at air, droplets at the cooled surface and the heat treated glass sample at 500, 540 and 580°C in addition to traces from LiNb 3 O 8. Crystallite size of the main phases determined from the X-ray diffraction peaks is in the range of <100 nm. The fraction of crystalline (LiNbO 3) phase decreases with increase in the heat treatment temperature.

Physica B: Condensed Matter, 2010

Differential thermal analysis (DTA) and X-ray diffraction (XRD) have been employed to investigate... more Differential thermal analysis (DTA) and X-ray diffraction (XRD) have been employed to investigate the copper oxide content dependence of the glass transition temperatures data, activation energy for the glass transition E t , glass stability GS, fragility index Fi, the glass-forming ability (GFA) and crystallization behavior of {(100 À x) mol% Li 2 B 4 O 7-x mol% CuO} glass samples, where x= 0-40 mol% CuO. From the dependence of the glass transition temperature T g on the heating rate b, the fragility, F i , and the activation energy, E t , have been calculated. It is seen that F i and E t are attained their minimum values at 0 o x r 15 mol% of CuO. The addition of CuO above 15 mol% causes a decrease in the glass-forming ability and the supercooled liquid region SCL. Thermal stability has been monitored through the calculation of the temperature difference T x-T g , SCL region and the GS. The GFA has been investigated on the basis of Hrubÿ parameter K H , which is a strong indicator of GFA, and the relaxation time. Results of GFA are in good agreement with the fragility index, F i , calculations indicating that {90Li 2 B 4 O 7 Á 10CuO} is the best glass former. The stronger glass forming ability has decreasing the fragility index. XRD result indicates that no fully amorphous samples but a mixture of crystalline and amorphous phases are formed in the samples containing x4 25 mol% CuO and below it composed of glassy phase. Increasing the CuO content above 25 mol% helps the crystallization process, and thus promotes a distinct SCL region. XRD suggests the presence of micro-crystallites of remaining residual amorphous matrix by increasing the CuO content.

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

The affect of sulphur on the structural properties of iron sodium diborate glasses having the com... more The affect of sulphur on the structural properties of iron sodium diborate glasses having the composition {(100Àx)Na 2 B 4 O 7 + xFe 2 O 3 }+yS, where x ¼ 0:05, 0.15 and 0.25 mol% and Y ¼ 0, 2.5 and 5 wt% was studied by infrared, Mossbauer spectroscopy and magnetic susceptibility measurements. It was found that, for samples having 5 mol% Fe 2 O 3 and free from sulphur, the iron ions are present in both Fe 2+ and Fe 3+ states and also 92% of the total iron enters the glass network as a glass former. The ratio of Fe 3+ /Fe 2+ increases with increasing the iron content for sulphur-free samples and others containing sulphur. This ratio also decreases with increasing the sulphur content. The magnetic susceptibility was found to decrease with increasing the sulphur content. Also, the increase of Fe 2 O 3 content led to a less symmetrical environment of Fe 3+ ions and vice versa for the Fe 2+ environment.

scopemed.org

... 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

Pseudo-binary (100 À x)Li 2 B 4 O 7-xPb 3 O 4 , with x = 0-70 mol% PbO have been prepared and the... more Pseudo-binary (100 À x)Li 2 B 4 O 7-xPb 3 O 4 , with x = 0-70 mol% PbO have been prepared and their properties investigated. The glass transition temperature, density and molar volume have been determined as a function of composition. The values of T g and the molar volume decrease non-linearly while the density increases as the Pb 3 O 4 content is raised. Infrared spectra of the glasses reveal that a strong network consisting of diborate units breaks up by the addition of Pb 3 O 4. The absorption bands below 620 cm À1 show that PbO is one of the network formers of the glasses 70 P Pb 3 O 4 P 10; as they can be associated with vibrations of (PbO 4) 2À grouping. PbO plays a dual role in the glass network. The calculated values of N 4 [the fraction of borons which are tetrahedral] slightly decrease with PbO content up to 30 mol% and then increase with Pb 3 O 4 content up to 50 mol%, then followed by a decrease as the Pb 3 O 4 content rises further. The Vickers hardness of the glasses varies as a function of the PbO content in the same manner as the variation of N 4. The dc conductivity decreases with the Pb 3 O 4 concentration up to about 30 mol% and then increases thereafter.

Journal of Alloys and Compounds, 2009

Crystallization studies of glass samples [35 mol% Li 2 O-18 mol% SiO 2-47 mol% B 2 O 3 with addin... more Crystallization studies of glass samples [35 mol% Li 2 O-18 mol% SiO 2-47 mol% B 2 O 3 with adding x mol% TiO 2 ] where x = 0, 0.1, 0.5, 2 and 3 mol% TiO 2 , were conducted by the use of the non-isothermal differential thermal analysis (DTA) and the isothermal differential scanning calorimeter (DSC) techniques. Both techniques were used to study the crystallization process. Two different glass transformation peaks and one-crystallization peak temperatures were identified and the transformed fractions were determined as a function of time. The JMAK equation was used to determine the mechanisms that govern the nucleation and growth. Both the rate of growth, k, and the activation energy, E, for the crystallization process with titanium content was calculated. It was found that the values of E, as well as the rate of growth, k, depend on the influence of titanium oxide in the glass network as a modifier or as a former and the titanium content. The values of the Avrami parameter, n, were calculated using the both techniques for the investigated glass samples and were in excellent agreement. Both techniques concluded that, the crystallization mechanism could depend on the influence of the titanium in the glass network. The process of nucleation and growth rate depends on the titanium content.

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...

A l 2 O 3 SUBSTITUTED nickel zinc nano-ferrite Al x Ni 0.5-x Zn 0.5 Fe 2 O 4 (x = 0.0, 0.1, 0.2, ... more A l 2 O 3 SUBSTITUTED nickel zinc nano-ferrite Al x Ni 0.5-x Zn 0.5 Fe 2 O 4 (x = 0.0, 0.1, 0.2, 0.3) was prepared by the citrate sol-gel methodusing nickel, zinc, iron and aluminum nitratesand sintered at 800 o C for 3 h in air. Prepared nano-sized ferrites were characterized by X-ray diffraction, High resolution transmission and scanning electron microscopy and Fourier transforms infrared spectroscopy. The estimated crystallite sizes were in the range of 24.7-32.9 nm. HR-TEM data appears that all nano-ferrite samples are composed of more or less agglomerated nanoparticles with the average particle size of nanocrystallites is ~31 nm. The impact of introducing Al ions by Ni on themagnetic properties of the prepared nano-ferrite was investigated utilizing magnetic measurements at room temperature. The changing of crystallite sizes, lattice parameter and the surface area with increasing the Al content were determined. The saturation magnetization (Ms) and coercivity (Hc) values vary from 47.894-32.314 and 70.37-60.117 G; respectively.