Journal of Modern Materials <p align="justify"><a title="Click for Journal homepage" href="" target="_blank" rel="noopener"><img style="float: right; padding-left: 15px; padding-right: 5px;" src="" alt="JMM" /></a> Journal of Modern Materials aims to enhance the international exchange of scientific research activities related to all aspects of Material Science. It is an open access, peer-reviewed, materials research journal publishing quality research papers by AIJR Publisher.<br />Journal of modern materials is registered with CrossRef with doi: 10.21467/jmm and ISSN of this journal is 2456-4834 [online].</p> AIJR Publisher en-US Journal of Modern Materials 2456-4834 <div id="copyrightNotice">Author(s) retains full copyright of their article and grants non-exclusive publishing right to <strong>Journal of Modern Materials</strong> and its publisher "<a title="AIJR Publisher homepage" href="" target="_blank" rel="noopener">AIJR</a> (India)". Author(s) can archive pre-print, post-print, and published version/PDF to any open access, institutional repository, social media, or personal website provided that Published source must be acknowledged with citation and link to publisher version.<br />Click <a title="Copyright Policy" href="" target="_blank" rel="noopener">here</a> for more information on Copyright policy<br />Click <a title="Licensing Policy" href="">here</a> for more information on Licensing policy</div> Study of the Optical, Electrical, Structural and Morphological Properties of Electrodeposited Lead Manganese Sulphide (PbMnS) Thin Film Semiconductors for Possible Device Applications <p>Semiconductor thin films of lead manganese sulphide (PbMnS) have been successfully deposited on florinated tin oxide (FTO) conductive glass substrate using an electrodeposition method. Lead acetate (Pb(CH<sub>3</sub>COO)<sub>2</sub>), manganese sulphate (MnSO<sub>4</sub>.H<sub>2</sub>O) and thiourea (CH<sub>4</sub>N<sub>2</sub>S) were the precursor used for cadmium (Cd<sup>2+</sup>), manganese (Mn<sup>2+</sup>) and sulphur (S<sup>2-</sup>) sources respectively. The concentration of manganese (Mn<sup>2+</sup>) was varied while keeping the concentrations of Pb<sup>2+</sup> and S<sup>2-</sup> constant at 0.2 M and 0.1 M respectively. The deposited films were annealed at temperature of 250 <sup>o</sup>C and subjected for optical, electrical, structural and morphological characterizations. The results of the characterizations showed that the deposited thin films of PbMnS have high absorbance, high absorption coefficient throughout VIS and NIR regions. The band gap energy of the films is tuned to the order of 1.9 eV to 2.0 eV and tends to constant as concentration of Mn<sup>2+</sup> increased. The electrical properties (electrical resistivity and conductivity) of the films are dependent on the concentration of Mn<sup>2+</sup> and film thickness. The range of values of the electrical properties is found to be within the range of values for semiconductor materials. The XRD analysis revealed that the deposited thin films of PbMnS is crystalline but the crystallinity declined with increase in concentration of Mn<sup>2+</sup>. The SEM morphology showed that the surfaces of the films are highly homogeneous in nature and particle sizes are uniform on the substrate with the majority of the particles been spherical in shape. These observed properties exhibited by the deposited thin films of PbMnS make the films good materials for many optoelectronic and electronic applications such as solar cell, light emitting diode (LED), photodetector etc.</p> Augustine Nwode Nwori Nnaedozie Laz Ezenwaka Ifenyinwa Euphemia Ottih Ngozi, Agatha Okereke Nonso Livinus Okoli Copyright (c) 2021 Augustine Nwode Nwori, Nnaedozie Laz Ezenwaka, Ifenyinwa Euphemia Ottih, Ngozi, Agatha Okereke, Nonso Livinus Okoli (Author) 2021-12-04 2021-12-04 8 1 40 51 10.21467/jmm.8.1.40-51 Structure and New Substructure of α-Ti2O3: X-ray Diffraction and Theoretical Study <p>The Crystal structure of both <em>α</em>-Ti<sub>2</sub>O<sub>3 </sub>and its new substructure with a halved c-axis has been investigated by single-crystal X-ray diffraction and density functional theory (DFT) calculations. The <em>α</em>-Ti<sub>2</sub>O<sub>3 </sub>substructure described in the R-3m space group, reveals an unusual 12-fold high coordination of Ti atoms forming edge and face-sharing distorted hexagonal prisms TiO<sub>12 </sub>stacking along the c-axis. The Hubbard-corrections predict a close bandgap for both α-Ti<sub>2</sub>O<sub>3</sub> and its substructure; whereas a comparative study of their relative stability indicates that the substructure is thermodynamically less stable.</p> Soumia Merazka Lamia Hammoudi Mohammed Kars Mohamed Sidoumou Thierry Roisnel Copyright (c) 2021 Soumia Merazka, Lamia Hammoudi, Mohammed Kars, Mohamed Sidoumou, Thierry Roisnel 2021-04-01 2021-04-01 8 1 3 11 10.21467/jmm.8.1.3-11 Mechanical Strengths of Sawdust-Ash-Admixed Gum Arabic Concrete <p>Gum Arabic and sawdust ash were used both as an emulsifier admixture and supplementary cement material to address some of the gaps between pozzolanic and conventional concretes. Four concrete mixtures of 1: 2.24: 2.71, with a water-cement ratio of 0.5, and cement content of 370 kg/m<sup>3</sup>, was used. The concrete mixtures were designated as M-00, M-00GA, M-10GAS, and M-30GAS, signifying the control, control with gum Arabic (GA), and mix with both gum Arabic and sawdust ash (GAS), respectively. The dosage was 0.5 % of GA and the SDA replacement by wt. % was at 10 % and 30 %, respectively. The concrete samples were cured for 90 days, and tested for mechanical strengths. The results showed that adding GA alone to concrete mixture improved the mechanical strengths of the concrete and the gum Arabic acted like an accelerator. When both GA and SDA were used together in the dosage of 0.5 % with 10 % and 30 % proportions respectively, the mechanical strengths of the concrete decreased. The findings also reported that the two-third strength ratio at 28-days of curing which is used for the conventional concrete in stripping the formwork, may not be appropriate for use on pozzolanic concrete. This is because of the delay in setting times and thus, attaining the required design strength. Therefore, it is proposed to be taken at an age beyond 28 days of curing to carter for the pozzolanic effects which starts well above 28-days.</p> Augustine Uchechukwu Elinwa Copyright (c) 2021 Augustine Uchechukwu Elinwa 2021-06-03 2021-06-03 8 1 12 29 10.21467/jmm.8.1.12-29 Study on Properties of Concrete with Iron Ore Tailing and Glass Waste <p>The aim of this research is to test the characteristics of concrete by substitute fine aggregate with iron ore tailings and partial glass powder as in the place of cement. Concrete with waste products such as glass powder and iron ore tailings offer technical, economic and environmental advantages. In this experimental investigation, glass powder is replaced with cement by 10%, 20% and 30% and iron ore tailings with fine aggregates by 30% which is the optimum percentage. To study the role of glass powder and iron ore tailings combination in concrete. The properties such compressive strength, flexural strength, tensile strength and also durability parameters likely water absorption investigation for M40 concrete is carried out with different percentages of glass powder by keeping the iron ore tailings percentage constant. At 30% glass powder substitution as cement and sand with IOT increases concrete effectiveness. The concrete with 10% glass powder &amp; 30% iron ore tailings showed a higher strength compared to the conventional mix for 28 days. Concrete mix containing 10% GP and 30% IOT showed higher flexural strength of 5.05 MPa for 28 days. Splitting tensile strength value is also increasing i. e for 10% glass powder and 30% IOT, obtained splitting tensile strength was 4.48 MPa and modulus of elasticity value was has also increased. Water absorption experiment consequences results that water absorption decreases with an increase in GP percentage. The concrete workability tends to decrease when with glass powder content increase. Concrete containing 10% glass powder and 30% IOT showed maximum strength and it is considered as the optimum dosage.</p> KS Sushmitha P Dhanabal Copyright (c) 2021 KS Sushmitha, P Dhanabal (Author) 2021-12-04 2021-12-04 8 1 30 39 10.21467/jmm.8.1.30-39