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Effect of Reheating and Quenching on the Cathodoluminescence Intensity of Free Lime in Steelmaking Slag

Published online by Cambridge University Press:  17 May 2021

Susumu Imashuku Open the ORCID record for Susumu Imashuku [Opens in a new window] ,
Makoto Nagasako  and
Kazuaki Wagatsuma
Susumu Imashuku*
Affiliation:
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai980-8577, Japan
Makoto Nagasako
Affiliation:
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai980-8577, Japan
Kazuaki Wagatsuma
Affiliation:
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai980-8577, Japan
*
*Author for correspondence: Susumu Imashuku, E-mail: susumu.imashuku@imr.tohoku.ac.jp
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Abstract

Determining free lime content in steelmaking slag is crucial for its safe reuse in road construction. A simple method has been recently developed to rapidly derive this value via cathodoluminescence (CL) imaging of steelmaking slag, previously quenched from 1,000°C to room temperature, according to the illuminated areas corresponding to free lime (luminescence peak at 600 nm). This quenching is required to obtain intense CL from free lime, but the mechanism of such signal enhancement is still unknown. Therefore, the present study investigated the mechanism by comparing the microstructures, CL images, and CL spectra of free lime in quenched and unquenched steelmaking slag. Large amounts of defects, including dislocations, were observed in the free lime emitting intense luminescence at 600 nm, whereas the samples without clear CL exhibited only a few defects. These results and previous studies suggest that the luminescence at 600 nm from free lime is enhanced by the CL originating from oxygen vacancies (380 nm); therefore, the enhancement of the intensity of the free lime CL peak could be attributed to the increase in the oxygen vacancies via quenching from 1,000°C to room temperature.

Keywords

cathodoluminescencefree limeluminescence enhancementoxygen vacancyquenchscanning electron microscopy-cathodoluminescence systemscanning transmission electron microscopysteelmaking slag
Type
Materials Science Applications
Information
Microscopy and Microanalysis , Volume 27 , Issue 3 , June 2021 , pp. 484 - 490
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of the Microscopy Society of America

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