Enhancement of thermoelectric properties of Yb0.25Co4Sb12 skutterudites through Ni substitution

In this work, we investigate the effects of Ni doping on the thermoelectric (TE) properties of Yb0.25Co4Sb12 sample. Yb0.25Co4-xNixSb12 (0 ≤ x ≤ 0.5) samples were prepared by mechanical alloying and subsequently consolidated by spark plasma sintering. The morphology of consolidated samples were char...

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Main Authors:	Ali Bashir, Mohamed Bashir, Suhana Mohd Said, Mohd Faizul Mohd Sabri, Yuzuru Miyazaki, Dhafer Abdul Ameer Shnawah, Masanori Shimada, Mohamed Hamid Elsheikh
Format:	Article
Language:	English
Published:	Penerbit Universiti Kebangsaan Malaysia 2018
Online Access:	http://journalarticle.ukm.my/11994/ http://journalarticle.ukm.my/11994/ http://journalarticle.ukm.my/11994/1/21%20Mohamed%20Bashir.pdf

id	ukm-11994
recordtype	eprints
spelling	ukm-119942018-08-17T09:03:12Z http://journalarticle.ukm.my/11994/ Enhancement of thermoelectric properties of Yb0.25Co4Sb12 skutterudites through Ni substitution Ali Bashir, Mohamed Bashir Suhana Mohd Said, Mohd Faizul Mohd Sabri, Yuzuru Miyazaki, Dhafer Abdul Ameer Shnawah, Masanori Shimada, Mohamed Hamid Elsheikh, In this work, we investigate the effects of Ni doping on the thermoelectric (TE) properties of Yb0.25Co4Sb12 sample. Yb0.25Co4-xNixSb12 (0 ≤ x ≤ 0.5) samples were prepared by mechanical alloying and subsequently consolidated by spark plasma sintering. The morphology of consolidated samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM-EDS). The thermoelectric properties of bulk samples were measured from room temperature to 800 K. The XRD analysis confirmed that, the successful formation of the Co4Sb12 skutterudite phase and Ni is substituted into Co site of the skutterudite crystal lattice. Moreover, the electrical resistivity decreased to 14.6 μΩm at 785 K for Yb0.25Co3.5Ni0.5Sb12 sample, due to increase of the electron concentration by Ni-addition. The absolute Seebeck coefficient reached the highest value of 223 μV/K at 592 K for Yb0.25Co3.7Ni0.3Sb12 sample, thus yielding a maximum value of power factor of 2.41 × 10-3 W/mK2 at 592 K. The highest dimensionless thermoelectric figure of merit value ZT of 0.49 at 692 K has been achieved for the Yb0.25Co3.7Ni0.3Sb12 sample, compared to ZT=0.06 for the Yb0.25Co4Sb12 sample at same temperature. This work indicates a strategy to improve the thermoelectric performance by Ni substitution of Co sites in the Yb0.25Co4Sb12 skutterudite through simultaneous improvement of its electrical conductivity, Seebeck coefficient and reduction of its thermal conductivity. Penerbit Universiti Kebangsaan Malaysia 2018-01 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/11994/1/21%20Mohamed%20Bashir.pdf Ali Bashir, Mohamed Bashir and Suhana Mohd Said, and Mohd Faizul Mohd Sabri, and Yuzuru Miyazaki, and Dhafer Abdul Ameer Shnawah, and Masanori Shimada, and Mohamed Hamid Elsheikh, (2018) Enhancement of thermoelectric properties of Yb0.25Co4Sb12 skutterudites through Ni substitution. Sains Malaysiana, 47 (1). pp. 181-187. ISSN 0126-6039 http://www.ukm.my/jsm/english_journals/vol47num1_2018/contentsVol47num1_2018.html
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
language	English
description	In this work, we investigate the effects of Ni doping on the thermoelectric (TE) properties of Yb0.25Co4Sb12 sample. Yb0.25Co4-xNixSb12 (0 ≤ x ≤ 0.5) samples were prepared by mechanical alloying and subsequently consolidated by spark plasma sintering. The morphology of consolidated samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM-EDS). The thermoelectric properties of bulk samples were measured from room temperature to 800 K. The XRD analysis confirmed that, the successful formation of the Co4Sb12 skutterudite phase and Ni is substituted into Co site of the skutterudite crystal lattice. Moreover, the electrical resistivity decreased to 14.6 μΩm at 785 K for Yb0.25Co3.5Ni0.5Sb12 sample, due to increase of the electron concentration by Ni-addition. The absolute Seebeck coefficient reached the highest value of 223 μV/K at 592 K for Yb0.25Co3.7Ni0.3Sb12 sample, thus yielding a maximum value of power factor of 2.41 × 10-3 W/mK2 at 592 K. The highest dimensionless thermoelectric figure of merit value ZT of 0.49 at 692 K has been achieved for the Yb0.25Co3.7Ni0.3Sb12 sample, compared to ZT=0.06 for the Yb0.25Co4Sb12 sample at same temperature. This work indicates a strategy to improve the thermoelectric performance by Ni substitution of Co sites in the Yb0.25Co4Sb12 skutterudite through simultaneous improvement of its electrical conductivity, Seebeck coefficient and reduction of its thermal conductivity.
format	Article
author	Ali Bashir, Mohamed Bashir Suhana Mohd Said, Mohd Faizul Mohd Sabri, Yuzuru Miyazaki, Dhafer Abdul Ameer Shnawah, Masanori Shimada, Mohamed Hamid Elsheikh,
spellingShingle	Ali Bashir, Mohamed Bashir Suhana Mohd Said, Mohd Faizul Mohd Sabri, Yuzuru Miyazaki, Dhafer Abdul Ameer Shnawah, Masanori Shimada, Mohamed Hamid Elsheikh, Enhancement of thermoelectric properties of Yb0.25Co4Sb12 skutterudites through Ni substitution
author_facet	Ali Bashir, Mohamed Bashir Suhana Mohd Said, Mohd Faizul Mohd Sabri, Yuzuru Miyazaki, Dhafer Abdul Ameer Shnawah, Masanori Shimada, Mohamed Hamid Elsheikh,
author_sort	Ali Bashir, Mohamed Bashir
title	Enhancement of thermoelectric properties of Yb0.25Co4Sb12 skutterudites through Ni substitution
title_short	Enhancement of thermoelectric properties of Yb0.25Co4Sb12 skutterudites through Ni substitution
title_full	Enhancement of thermoelectric properties of Yb0.25Co4Sb12 skutterudites through Ni substitution
title_fullStr	Enhancement of thermoelectric properties of Yb0.25Co4Sb12 skutterudites through Ni substitution
title_full_unstemmed	Enhancement of thermoelectric properties of Yb0.25Co4Sb12 skutterudites through Ni substitution
title_sort	enhancement of thermoelectric properties of yb0.25co4sb12 skutterudites through ni substitution
publisher	Penerbit Universiti Kebangsaan Malaysia
publishDate	2018
url	http://journalarticle.ukm.my/11994/ http://journalarticle.ukm.my/11994/ http://journalarticle.ukm.my/11994/1/21%20Mohamed%20Bashir.pdf
first_indexed	2023-09-18T20:01:37Z
last_indexed	2023-09-18T20:01:37Z
_version_	1777406886308478976

Enhancement of thermoelectric properties of Yb0.25Co4Sb12 skutterudites through Ni substitution

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