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Title:Weathering induced morphological modification on the thermal diffusivity of natural pyrrhotite : a thermal lens study
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)
Files:URL https://www.tandfonline.com/doi/epub/10.1080/14786435.2021.1872810?needAccess=true
 
Language:English
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
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.
Keywords:pyrrhotite, thermal diffusivity, thermal lens, ageing, morphology
Year of publishing:2021
Number of pages:str. 819-835
Numbering:Vol. 101, no. 7
PID:20.500.12556/RUNG-7404 New window
COBISS.SI-ID:113318915 New window
UDC:54
ISSN on article:1478-6443
DOI:10.1080/14786435.2021.1872810 New window
NUK URN:URN:SI:UNG:REP:0AC5IRLV
Publication date in RUNG:30.06.2022
Views:2308
Downloads:8
Metadata:XML DC-XML DC-RDF
:
SWAPNA, Mohanachandran Nair Sindhu, GOKUL, Vijayakumar, RAJ, Vimal, MANU RAJ, R., KUMAR, S. N. and IYER SANKARARAMAN, Sankaranarayana, 2021, Weathering induced morphological modification on the thermal diffusivity of natural pyrrhotite : a thermal lens study. Philosophical magazine [online]. 2021. Vol. 101, no. 7, p. 819–835. [Accessed 26 March 2025]. DOI 10.1080/14786435.2021.1872810. Retrieved from: https://www.tandfonline.com/doi/epub/10.1080/14786435.2021.1872810?needAccess=true
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Record is a part of a journal

Title:Philosophical magazine
Publisher:Taylor & Francis Group
ISSN:1478-6443
COBISS.SI-ID:19158567 New window

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