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Mechanical alloying synthesis and comprehensive characterization of SmCoO 3 perovskite through XRD, XRF, DSC, and UVVis absorbance

Abstract

In this study, a nanostructured perovskite SmCoO3 material was successfully synthesized at ambient temperature using the mechanical alloying (MA) technique. A powdered mixture of samarium and pure metallic cobalt (Co) precursors was subjected to 24 h of milling to achieve the intended sample. The phase transformations induced by high-energy milling were investigated through ex situ X-Ray Diffraction (XRD) measurements and analyzed using the Rietveld method. Some properties of SmCoO3 were examined using techniques such as Differential Scanning Calorimetry (DSC), heat treatment, XRF (X-Ray Fluorescence), and UVVis absorbance. These comprehensive characterizations provide valuable insights into the synthesis and properties of nanostructured SmCoO3 perovskite, facilitating its potential applications in various fields.

article Article

date_range 2024

language English

link Link of the paper

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Bernardino Roberta

Correia junior Darbens

Pinto Camila

Rebelo Querem

De souza Sergio

Triches Daniela

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Featured Keywords

X-ray diffraction

Rare-earth perovskite

Rietveld method

Mechanical alloying

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Assessment of reinforced concrete building damages following the Kahramanmaraş earthquakes in Malatya, Turkey (February 6, 2023)

Abstract

Earthquakes of magnitude Mw = 7.7 and Mw = 7.6 hit the city of Kahramanmaraş (Turkey) on 6 February 2023. These earthquakes caused serious damage in 11 provinces in Turkey resulting in over 50,000 deaths and huge economic losses with the collapse of thousands of buildings. Two consecutive devastating earthquakes have severely damaged the reinforced concrete building stock located in Malatya. There are many reasons reinforced concrete structures suffer damage under the influence of seismic loads. These reasons can be listed as material and section properties that do not comply with earthquake codes, workmanship defects, ground parameters that are not considered and design errors, as seen in field investigations after earthquakes in Turkey in the past. In this research, a field study was conducted on reinforced concrete buildings damaged after the earthquakes in Malatya province. The causes of structural damages in reinforced concrete buildings between 6–26 years of age were assessed in terms of design and material defects. The structural damages were mainly caused due to insufficient stirrups in structural members, short column, strong beam–weak column, failures of infill walls, soft story type collapse, poor concrete quality, and reinforcement corrosion. In addition to the field investigation, the spectrum relationships created using raw acceleration data obtained from DEMP (Disaster and Emergency Management Presidency) stations in Malatya province were compared with the design response spectra.

article Article

date_range 2024

language English

link Link of the paper

Collapsed buildings

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