A recent result of Schmidt has brought Williamson matrices back into the spotlight. In this paper a new algorithm is introduced to search for hard to find Williamson matrices. We find all nonequivalent Williamson matrices of odd order n up to n = 59. It turns out that there are none for n = 35, 47, 53, 59 and it seems that the Turyn class may be the only infinite class of these matrices. AMS Su...

T The nanostructures of Fe2O3 have been synthesized applying sour cherry juice and iron chloride as a low-cost and eco-friendly method at ambient conditions. Sour cherry juice has been used as a surfactant and the kind of surfactant had an important effect on the size and morphology of the products. The effect of sour cherry juice concentration and calcination temperature...

Variation in microstructural features of 2024 aluminum alloy plastically deformed by equal channel angular pressing (ECAP) at room temperature, was investigated by X-Ray diffraction in this work. These include dislocation density dislocation characteristic and the cell size of crystalline domains. Dislocations contrast factor was calculated using elastic constants of the alloy such as C 11, C 2...

Lanthanum (La) doped Ceria (CeO2) has attracted considerable interest as a candidate material for thermal barrier coating (TBC) because of its low thermal conductivity and potential capability to be operated above 1250°C. In this study, La2Ce2O7 powder was synthesized through the ball mill method. The crystal structure of La3+ su...

The effect of mechanical milling on the thermal behavior pyrophyllite ore from a deposit in Parsovici, Bosnia and Herzegovina, was characterized by X-ray powder diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, Particle size distribution. material followed thermogravimetric differential analysis correlated to its microstructural properties. Williamson-Hall mode...

Metal parts produced by Additive Manufacturing, and in particular Laser Powder Bed Fusion (LPBF), suffer from residual stresses due to high thermal gradients causing cyclic expansion contraction of the alloy. This work deals with determination stress rapidly solidified AlSi10Mg samples using two non-destructive techniques: Raman spectroscopy, rapid, unconventional but applicable AlSi alloys, XR...

This study reports on the structure analyses of NiO-BCZY (BCZY = BaCe0.54Zr0.36Y0.1O3-δ) anode composite materials with ratio 50:50 for proton ceramic fuel cells (PCFCs) application. A product sintered was developed to understand structural properties materials. The objectives this work were (a) investigate lattice expansion by using a high-temperature XRD (HT-XRD) from 400–700 °C; and (b) calc...

Los fosfatos de calcio son materiales biocerámicos gran importancia utilizados en el área recubrimientos bioactivos para implantes metálicos. En presente estudio, una muestra fue sintetizada mediante método precipitación química a partir Ca(NO3)2 y (NH4)2HPO4. La técnica difracción rayos-X utilizada realizar un análisis cualitativo cuantitativo las fases cristalinas presentes material los métod...