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4 record(s) found

The structural, physical and optical properties of borotellurite glasses incorporated with silica from rice husk

Abstract

From the agricultural waste of rice (rice husk), high purity SiO2 with about 98.548 % purity was extracted using a very simple room temperature leaching method. Using the rice husk extracted silicate, a system of silicate borotellurite glasses was fabricated with composition equation [(TeO2)0.7 (B2O3)0.3]1-x (SiO2)x with x= 0.0, 0.1, 0.2, 0.3 and 0.4. The density and molar volume were measured, and Fourier transform infrared (FTIR), X-ray diffraction (XRD) and UV-Vis analyses were performed on the glasses. Both the density and molar volume decreased and the XRD pattern confirmed the glasses’ amorphous nature. The FTIR showed the presence of TeO3, TeO4, BO3, BO2O, SiO4, and H3BO3 structural units in the glasses. The concentrations of TeO3, TeO4, BO3 and BO2O structures were determined by the deconvolution of the FTIR spectra using an Origin software. The optical energy band gap, index of refraction, oxygen packing density (OPD), molar refractive index, metallization criterion and pola.....

Article Published 2018 1271 hits Available

Structure and Physical Properties of 30MgSO4-(70-x) P2O5-xSm2O3 glasses

Aliyu Mohammed Aliyu

Abstract

Glassesin the series 30MgSO4-(70-x) P2O5-xSm2O3 0.2 ≤x≤1.0 mol percentwere prepared by single step melt-quenchtechniques, thestructure, physicalandoptical propertiesofsamarium oxide at different concentrationswere studied.The amorphous phase of the samples was verifiedby X-ray diffraction spectroscopy, the structural units were investigated using Fourier Transform Infrared, Raman and NMR spectroscopy where the spectra revealthe presence of symmetric, asymmetric, torsoionalandbending vibration of phosphate groups,the NMR spectra reveals the changes in Qndistributionhere discussed,thecompositional dependenceonphysical (density, average molar weight,dielectric constant,Inter-nuclear distance, Field strength,Molar volume, Molar refractivity etc) and optical parameterswere determined. In terms of structural modifications, there is variation of density and molar volume, t.....

Article Published 2019 879 hits Available

Oxide ion/electronic polarizability, optical basicity and linear dielectric susceptibility of TeO2 - B2O3 - SiO2 glasses

Saad Aliyu Umar

Abstract

A system of bio-silica borotellurite glasses was fabricated based on the chemical formula [(TeO2)0.7 (B2O3)0.3]1-x (SiO2)x with x = 0.1, 0.2, 0.3, and 0.4 using the melt-quenching technique using silica (98.548% SiO2, from rice husk), TeO2 (Alfar Aeser, 99.9%) and B2O3 (Alfar Aeser, 99.9%). Measurements and characterizations such as density and molar volume measurements, XRD analysis, FTIR, and UV?Vis spectroscopes were performed on the studied glasses. The objective was to determine the glasses? applicability in optoelectronics, non-linear optics, and laser technologies through polarizability, linear electric susceptibility, and optical basicity study. Apart from confirming the amorphous nature of the glasses, the XRD analysis identified the presence of a crystalline phase of tellurium oxide (?-TeO2) formed. The FTIR spectral study revealed the presence of TeO3, BO3, and SiO4 structural units in the studied glasses. The refractive index (2.3026 ? 2.2651), molar polarizability (8.0696 .....

Article Published 2021 1394 hits Available

Exploring students experience on distance education during the COVID-19 pandemic in Bauchi State Nigeria

Aliyu, Umar Ibrahim

Abstract

This study aims to reveal the experiences and obstacles on distance education faced by students during the Covid-19 pandemic in Bauchi State Nigeria. A phenomenological research was adopted for the study through shorter case interview. Ten (10) senior secondary school students were selected through purposeful and snow-ball sampling for the study. Thematic analysis was used to synthesize the data collected and highlight key findings. The results indicate that the students views were categorized into positive and negative while the obstacles faced were technical, pedagogical, environment and longing for school. Recommendations were offered to overcome and understand these obstacles to benefit teachers, students and curriculum developers in the future. ..

Article Published 2021 905 hits Available

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