| Title: | Weathering induced morphological modification on the thermal diffusivity of natural pyrrhotite : a thermal lens study |
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| Authors: | ID Swapna, Mohanachandran Nair Sindhu (Author)
ID Gokul, Vijayakumar (Author)
ID Raj, Vimal (Author)
ID Manu Raj, R. (Author)
ID Kumar, S. N. (Author)
ID Iyer Sankararaman, Sankaranarayana (Author) |
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| Files: |  https://www.tandfonline.com/doi/epub/10.1080/14786435.2021.1872810?needAccess=true
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| Language: | English |
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| Work type: | Unknown |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | Natural pyrrhotites have gained significant attention due to
their interesting electronic, antimicrobial, and chemical
properties. The present work attempts to explore the
morphology-induced modifications in the thermal
characteristics of natural pyrrhotite due to ageing. The
morphological, elemental, structure, optical, and thermal
characterisations help in understanding the effect of
ageing. The effects of five years of ageing of the sample
are (i) Field Emission Scanning Electron Microscopic
analysis reveals a morphological transformation from flakes
to agglomerated powder, (ii) elemental analyses suggest
the ageing induced compositional modification (iii) the
Tauc plot analysis shows a bandgap energy modification
from 1.46 eV to 1.92 eV, (iv) X-ray Diffraction (XRD), Fourier
Transform Infrared, and X-ray photoelectron spectroscopic
studies affirm the formation of oxy-hydroxides (v) the XRD
data indicates an increase of dislocation density, and (vi)
Photoluminescence study shows a deep violet emission
evidenced through the CIE plot. The study by the thermal
lens technique shows a lowering of thermal diffusivity
study by 23%, due to the morphological modifications,
adsorbed/chemisorbed hydroxyl groups, and the formation
of secondary compounds due to oxidation and weathering.
The phonon boundary scattering, weathering induced
smaller grain size, reduced phonon mean free path, and
point defects also account for the lowering of the thermal
diffusivity value and thereby influencing its properties. |
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| Keywords: | pyrrhotite, thermal diffusivity, thermal lens, ageing, morphology |
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| Year of publishing: | 2021 |
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| Number of pages: | str. 819-835 |
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| Numbering: | Vol. 101, no. 7 |
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| PID: | 20.500.12556/RUNG-7404  |
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| COBISS.SI-ID: | 113318915 |
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| UDC: | 54 |
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| ISSN on article: | 1478-6443 |
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| DOI: | 10.1080/14786435.2021.1872810 |
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| NUK URN: | URN:SI:UNG:REP:0AC5IRLV |
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| Publication date in RUNG: | 30.06.2022 |
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| Views: | 1981 |
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| Downloads: | 7 |
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