Nowadays kaolin raw material is usually used to produce nano-kaolin for geopolymer enhancement by using firing method. In the present study, kaolin used was taken from the Naqus Formation (Cambro-Ordovician age), west of Gabal El Gunna, Sinai, Egypt. Nano-kaolin material is an ultrafine material and was prepared from the taken kaolin by the firing process at 800 ℃ for 2 h with a heating rate of 5 ℃/min. Six mixes were prepared and their laboratory specimens were made and cured up to 90 days. ...

Uranium–europium mixed oxides (U_1-yEu_y)O_2-x (y=0.2–0.8) were prepared by the citrate gel combustion technique and characterized by X-ray diffraction (XRD). Single phase fluorite structure was observed in those solid solutions with y≤0.6. The solid solutions with y>0.6 were found to be biphasic, with the second phase being cubic Eu₂O₃. Heat capacity and enthalpy increment measurements were carri...

Porous Si₃N₄ ceramics were prepared by aqueous gelcasting using Si₃N₄ poly-hollow microspheres (PHMs) as pore-forming agent. The effects of solid loading of Si₃N₄ slurry and Si₃N₄ PHM content on the properties of porous Si₃N₄ ceramics were investigated. Only β-Si₃N₄ phase is observed in porous Si₃N₄ ceramics, and Si₃N₄ ...

In this work, we revisit and show how the structural and photoluminescent properties of the MgGa₂O₄ceramic compound have been kept unchanged for more than two decades. The obtained results confirm the high quality, radiativeefficiency, and chemical stability of this ceramic, proving that the material is a strong candidate to be used in optical device applications with relatively long useful life.

This paper presents the mechanical and thermal properties of flax fabric reinforced fly ash based geopolymer composites. Geopolymer composites reinforced with 2.4, 3.0 and 4.1 wt% woven flax fabric in various layers were fabricated using a hand lay-up technique and tested for mechanical properties such as flexural strength, flexural modulus, compressive strength, hardness, and fracture toughness. All mechanical properties were improved by increasing the flax fibre contents, and showed superio...

A library of ceramic compounds based on the lead-free (K_xNa_1-x)_1-yLi_y(Nb_1-zTa_z)O₃ solid solution has been synthesized and characterized using high-throughput experimentation (HTE) method. The phase space previously reported by Saito and Takao has been expanded to {{x, 0.1, 1.0}, {y, 0, 0.1}, {z, 0, 0.2}}, and new phase boundaries are observed. The relativ...

In this study, bulk samples of multiferroic with compositional formula, BiFeO₃ and Bi_0.825A_0.175FeO₃ (A=La, Pb), were synthesized by solid state reaction route. X-ray diffraction (XRD) along with the Rietveld refinement revealed the distorted rhombohedral (R3c) structure for pristine BiFeO₃ and Bi_0.825La_0.175FeO₃ and tetragonal (P4/mmm) for Bi_0.825Pb