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Investigation of Phase Segregation in p-Type Bi(0.5)Sb(1.5)Te(3) Thermoelectric Alloys by In Situ Melt Spinning to Determine Possible Carrier Filtering Effect
One means of enhancing the performance of thermoelectric materials is to generate secondary nanoprecipitates of metallic or semiconducting properties in a thermoelectric matrix, to form proper band bending and, in turn, to induce a low-energy carrier filtering effect. However, forming nanocomposites...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8704284/ https://www.ncbi.nlm.nih.gov/pubmed/34947161 http://dx.doi.org/10.3390/ma14247567 |
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author | Kim, Dong Ho Kim, TaeWan Lee, Se Woong Kim, Hyun-Sik Shin, Weon Ho Kim, Sang-il |
author_facet | Kim, Dong Ho Kim, TaeWan Lee, Se Woong Kim, Hyun-Sik Shin, Weon Ho Kim, Sang-il |
author_sort | Kim, Dong Ho |
collection | PubMed |
description | One means of enhancing the performance of thermoelectric materials is to generate secondary nanoprecipitates of metallic or semiconducting properties in a thermoelectric matrix, to form proper band bending and, in turn, to induce a low-energy carrier filtering effect. However, forming nanocomposites is challenging, and proper band bending relationships with secondary phases are largely unknown. Herein, we investigate the in situ phase segregation behavior during melt spinning with various metal elements, including Ti, V, Nb, Mo, W, Ni, Pd, and Cu, in p-type Bi(0.5)Sb(1.5)Te(3) (BST) thermoelectric alloys. The results showed that various metal chalcogenides were formed, which were related to the added metal elements as secondary phases. The electrical conductivity, Seebeck coefficient, and thermal conductivity of the BST composite with various secondary phases were measured and compared with those of pristine BST alloys. Possible band alignments with the secondary phases are introduced, which could be utilized for further investigation of a possible carrier filtering effect when forming nanocomposites. |
format | Online Article Text |
id | pubmed-8704284 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-87042842021-12-25 Investigation of Phase Segregation in p-Type Bi(0.5)Sb(1.5)Te(3) Thermoelectric Alloys by In Situ Melt Spinning to Determine Possible Carrier Filtering Effect Kim, Dong Ho Kim, TaeWan Lee, Se Woong Kim, Hyun-Sik Shin, Weon Ho Kim, Sang-il Materials (Basel) Article One means of enhancing the performance of thermoelectric materials is to generate secondary nanoprecipitates of metallic or semiconducting properties in a thermoelectric matrix, to form proper band bending and, in turn, to induce a low-energy carrier filtering effect. However, forming nanocomposites is challenging, and proper band bending relationships with secondary phases are largely unknown. Herein, we investigate the in situ phase segregation behavior during melt spinning with various metal elements, including Ti, V, Nb, Mo, W, Ni, Pd, and Cu, in p-type Bi(0.5)Sb(1.5)Te(3) (BST) thermoelectric alloys. The results showed that various metal chalcogenides were formed, which were related to the added metal elements as secondary phases. The electrical conductivity, Seebeck coefficient, and thermal conductivity of the BST composite with various secondary phases were measured and compared with those of pristine BST alloys. Possible band alignments with the secondary phases are introduced, which could be utilized for further investigation of a possible carrier filtering effect when forming nanocomposites. MDPI 2021-12-09 /pmc/articles/PMC8704284/ /pubmed/34947161 http://dx.doi.org/10.3390/ma14247567 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Kim, Dong Ho Kim, TaeWan Lee, Se Woong Kim, Hyun-Sik Shin, Weon Ho Kim, Sang-il Investigation of Phase Segregation in p-Type Bi(0.5)Sb(1.5)Te(3) Thermoelectric Alloys by In Situ Melt Spinning to Determine Possible Carrier Filtering Effect |
title | Investigation of Phase Segregation in p-Type Bi(0.5)Sb(1.5)Te(3) Thermoelectric Alloys by In Situ Melt Spinning to Determine Possible Carrier Filtering Effect |
title_full | Investigation of Phase Segregation in p-Type Bi(0.5)Sb(1.5)Te(3) Thermoelectric Alloys by In Situ Melt Spinning to Determine Possible Carrier Filtering Effect |
title_fullStr | Investigation of Phase Segregation in p-Type Bi(0.5)Sb(1.5)Te(3) Thermoelectric Alloys by In Situ Melt Spinning to Determine Possible Carrier Filtering Effect |
title_full_unstemmed | Investigation of Phase Segregation in p-Type Bi(0.5)Sb(1.5)Te(3) Thermoelectric Alloys by In Situ Melt Spinning to Determine Possible Carrier Filtering Effect |
title_short | Investigation of Phase Segregation in p-Type Bi(0.5)Sb(1.5)Te(3) Thermoelectric Alloys by In Situ Melt Spinning to Determine Possible Carrier Filtering Effect |
title_sort | investigation of phase segregation in p-type bi(0.5)sb(1.5)te(3) thermoelectric alloys by in situ melt spinning to determine possible carrier filtering effect |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8704284/ https://www.ncbi.nlm.nih.gov/pubmed/34947161 http://dx.doi.org/10.3390/ma14247567 |
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