Dependence of Solidification for Bi2Te3−xSex Alloys on Their Liquid States

Abstract The resistivity versus temperature (ρ-T) behaviours of liquid n-type Bi2Te3−x Se x (x = 0.3, 0.45 and 0.6) alloys are explored up to 1050 °C. A clear hump is observed on all ρ-T curves of the three studied Bi2Te3−x Se x melts during the heating process, which suggests that a temperature-ind...

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Autores principales:	Yuan Yu, Zhan Wu, Oana Cojocaru-Mirédin, Bin Zhu, Xiao-Yu Wang, Na Gao, Zhong-Yue Huang, Fang-Qiu Zu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c409636347494178af3dec358ab651cd
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spelling	oai:doaj.org-article:c409636347494178af3dec358ab651cd2021-12-02T12:32:29ZDependence of Solidification for Bi2Te3−xSex Alloys on Their Liquid States10.1038/s41598-017-02507-42045-2322https://doaj.org/article/c409636347494178af3dec358ab651cd2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02507-4https://doaj.org/toc/2045-2322Abstract The resistivity versus temperature (ρ-T) behaviours of liquid n-type Bi2Te3−x Se x (x = 0.3, 0.45 and 0.6) alloys are explored up to 1050 °C. A clear hump is observed on all ρ-T curves of the three studied Bi2Te3−x Se x melts during the heating process, which suggests that a temperature-induced liquid-liquid structural transition takes place in the melts. Based on this information, the solidification behaviours and microstructures of the alloys with different liquid states are investigated. The samples that experienced liquid structural transition show that the nucleation and growth undercooling degrees are conspicuously enlarged and the solidification time is shortened. As a result, the solidified lamellae are refined and homogenized, the prevalence of low-angle grain boundaries between these lamellae is increased, and the Vicker Hardness is enhanced. Atom probe tomography analyses prove that there is no segregation or nanoprecipitation within the grains, but the Te-rich eutectic structure and the evolution of composition near the Te-matrix phase boundary are investigated in a sample that experienced liquid structural transition. Our work implies that the solidification behaviours of Bi2Te3−xSex alloys are strongly related to their parent liquid states, providing an alternative approach to tailor the thermoelectric and mechanical properties even when only a simple solidification process is performed.Yuan YuZhan WuOana Cojocaru-MirédinBin ZhuXiao-Yu WangNa GaoZhong-Yue HuangFang-Qiu ZuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yuan Yu Zhan Wu Oana Cojocaru-Mirédin Bin Zhu Xiao-Yu Wang Na Gao Zhong-Yue Huang Fang-Qiu Zu Dependence of Solidification for Bi2Te3−xSex Alloys on Their Liquid States
description	Abstract The resistivity versus temperature (ρ-T) behaviours of liquid n-type Bi2Te3−x Se x (x = 0.3, 0.45 and 0.6) alloys are explored up to 1050 °C. A clear hump is observed on all ρ-T curves of the three studied Bi2Te3−x Se x melts during the heating process, which suggests that a temperature-induced liquid-liquid structural transition takes place in the melts. Based on this information, the solidification behaviours and microstructures of the alloys with different liquid states are investigated. The samples that experienced liquid structural transition show that the nucleation and growth undercooling degrees are conspicuously enlarged and the solidification time is shortened. As a result, the solidified lamellae are refined and homogenized, the prevalence of low-angle grain boundaries between these lamellae is increased, and the Vicker Hardness is enhanced. Atom probe tomography analyses prove that there is no segregation or nanoprecipitation within the grains, but the Te-rich eutectic structure and the evolution of composition near the Te-matrix phase boundary are investigated in a sample that experienced liquid structural transition. Our work implies that the solidification behaviours of Bi2Te3−xSex alloys are strongly related to their parent liquid states, providing an alternative approach to tailor the thermoelectric and mechanical properties even when only a simple solidification process is performed.
format	article
author	Yuan Yu Zhan Wu Oana Cojocaru-Mirédin Bin Zhu Xiao-Yu Wang Na Gao Zhong-Yue Huang Fang-Qiu Zu
author_facet	Yuan Yu Zhan Wu Oana Cojocaru-Mirédin Bin Zhu Xiao-Yu Wang Na Gao Zhong-Yue Huang Fang-Qiu Zu
author_sort	Yuan Yu
title	Dependence of Solidification for Bi2Te3−xSex Alloys on Their Liquid States
title_short	Dependence of Solidification for Bi2Te3−xSex Alloys on Their Liquid States
title_full	Dependence of Solidification for Bi2Te3−xSex Alloys on Their Liquid States
title_fullStr	Dependence of Solidification for Bi2Te3−xSex Alloys on Their Liquid States
title_full_unstemmed	Dependence of Solidification for Bi2Te3−xSex Alloys on Their Liquid States
title_sort	dependence of solidification for bi2te3−xsex alloys on their liquid states
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/c409636347494178af3dec358ab651cd
work_keys_str_mv	AT yuanyu dependenceofsolidificationforbi2te3xsexalloysontheirliquidstates AT zhanwu dependenceofsolidificationforbi2te3xsexalloysontheirliquidstates AT oanacojocarumiredin dependenceofsolidificationforbi2te3xsexalloysontheirliquidstates AT binzhu dependenceofsolidificationforbi2te3xsexalloysontheirliquidstates AT xiaoyuwang dependenceofsolidificationforbi2te3xsexalloysontheirliquidstates AT nagao dependenceofsolidificationforbi2te3xsexalloysontheirliquidstates AT zhongyuehuang dependenceofsolidificationforbi2te3xsexalloysontheirliquidstates AT fangqiuzu dependenceofsolidificationforbi2te3xsexalloysontheirliquidstates
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Dependence of Solidification for Bi2Te3−xSex Alloys on Their Liquid States

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