The Experts below are selected from a list of 9267 Experts worldwide ranked by ideXlab platform
Gang Chen - One of the best experts on this subject based on the ideXlab platform.
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enhancement in thermoelectric figure of merit of an n type half heusler compound by the Nanocomposite Approach
Advanced Energy Materials, 2011Co-Authors: Giri Joshi, Gang Chen, Weishu Liu, Xiao Yan, Hengzhi Wang, Zhifeng RenAbstract:An enhancement in the dimensionless thermoelectric fi gure-of-merit ( ZT ) of an n-type half-Heusler material is reported using a Nanocomposite Approach. A peak ZT value of 1.0 was achieved at 600 ° C‐700 ° C, which is about 25% higher than the previously reported highest value. The samples were made by ball-milling ingots of composition Hf 0.75 Zr 0.25 NiSn 0.99 Sb 0.01 into nanopowders and hot-pressing the powders into dense bulk samples. The ingots were formed by arc-melting the elements. The ZT enhancement mainly comes from reduction of thermal conductivity due to increased phonon scattering at grain boundaries and crystal defects, and optimization of antimony doping.
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enhanced thermoelectric figure of merit of p type half heuslers
Nano Letters, 2011Co-Authors: Xiao Yan, Giri Joshi, Yucheng Lan, Weishu Liu, Sangyeop Lee, Hui Wang, J W Simonson, S J Poon, Gang ChenAbstract:Half-Heuslers would be important thermoelectric materials due to their high temperature stability and abundance if their dimensionless thermoelectric figure of merit (ZT) could be made high enough. The highest peak ZT of a p-type half-Heusler has been so far reported about 0.5 due to the high thermal conductivity. Through a Nanocomposite Approach using ball milling and hot pressing, we have achieved a peak ZT of 0.8 at 700 °C, which is about 60% higher than the best reported 0.5 and might be good enough for consideration for waste heat recovery in car exhaust systems. The improvement comes from a simultaneous increase in Seebeck coefficient and a significant decrease in thermal conductivity due to nanostructures. The samples were made by first forming alloyed ingots using arc melting and then creating nanopowders by ball milling the ingots and finally obtaining dense bulk by hot pressing. Further improvement in ZT is expected when average grain sizes are made smaller than 100 nm.
Xiao Yan - One of the best experts on this subject based on the ideXlab platform.
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enhancement in thermoelectric figure of merit of an n type half heusler compound by the Nanocomposite Approach
Advanced Energy Materials, 2011Co-Authors: Giri Joshi, Gang Chen, Weishu Liu, Xiao Yan, Hengzhi Wang, Zhifeng RenAbstract:An enhancement in the dimensionless thermoelectric fi gure-of-merit ( ZT ) of an n-type half-Heusler material is reported using a Nanocomposite Approach. A peak ZT value of 1.0 was achieved at 600 ° C‐700 ° C, which is about 25% higher than the previously reported highest value. The samples were made by ball-milling ingots of composition Hf 0.75 Zr 0.25 NiSn 0.99 Sb 0.01 into nanopowders and hot-pressing the powders into dense bulk samples. The ingots were formed by arc-melting the elements. The ZT enhancement mainly comes from reduction of thermal conductivity due to increased phonon scattering at grain boundaries and crystal defects, and optimization of antimony doping.
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enhanced thermoelectric figure of merit of p type half heuslers
Nano Letters, 2011Co-Authors: Xiao Yan, Giri Joshi, Yucheng Lan, Weishu Liu, Sangyeop Lee, Hui Wang, J W Simonson, S J Poon, Gang ChenAbstract:Half-Heuslers would be important thermoelectric materials due to their high temperature stability and abundance if their dimensionless thermoelectric figure of merit (ZT) could be made high enough. The highest peak ZT of a p-type half-Heusler has been so far reported about 0.5 due to the high thermal conductivity. Through a Nanocomposite Approach using ball milling and hot pressing, we have achieved a peak ZT of 0.8 at 700 °C, which is about 60% higher than the best reported 0.5 and might be good enough for consideration for waste heat recovery in car exhaust systems. The improvement comes from a simultaneous increase in Seebeck coefficient and a significant decrease in thermal conductivity due to nanostructures. The samples were made by first forming alloyed ingots using arc melting and then creating nanopowders by ball milling the ingots and finally obtaining dense bulk by hot pressing. Further improvement in ZT is expected when average grain sizes are made smaller than 100 nm.
Giri Joshi - One of the best experts on this subject based on the ideXlab platform.
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enhancement in thermoelectric figure of merit of an n type half heusler compound by the Nanocomposite Approach
Advanced Energy Materials, 2011Co-Authors: Giri Joshi, Gang Chen, Weishu Liu, Xiao Yan, Hengzhi Wang, Zhifeng RenAbstract:An enhancement in the dimensionless thermoelectric fi gure-of-merit ( ZT ) of an n-type half-Heusler material is reported using a Nanocomposite Approach. A peak ZT value of 1.0 was achieved at 600 ° C‐700 ° C, which is about 25% higher than the previously reported highest value. The samples were made by ball-milling ingots of composition Hf 0.75 Zr 0.25 NiSn 0.99 Sb 0.01 into nanopowders and hot-pressing the powders into dense bulk samples. The ingots were formed by arc-melting the elements. The ZT enhancement mainly comes from reduction of thermal conductivity due to increased phonon scattering at grain boundaries and crystal defects, and optimization of antimony doping.
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enhanced thermoelectric figure of merit of p type half heuslers
Nano Letters, 2011Co-Authors: Xiao Yan, Giri Joshi, Yucheng Lan, Weishu Liu, Sangyeop Lee, Hui Wang, J W Simonson, S J Poon, Gang ChenAbstract:Half-Heuslers would be important thermoelectric materials due to their high temperature stability and abundance if their dimensionless thermoelectric figure of merit (ZT) could be made high enough. The highest peak ZT of a p-type half-Heusler has been so far reported about 0.5 due to the high thermal conductivity. Through a Nanocomposite Approach using ball milling and hot pressing, we have achieved a peak ZT of 0.8 at 700 °C, which is about 60% higher than the best reported 0.5 and might be good enough for consideration for waste heat recovery in car exhaust systems. The improvement comes from a simultaneous increase in Seebeck coefficient and a significant decrease in thermal conductivity due to nanostructures. The samples were made by first forming alloyed ingots using arc melting and then creating nanopowders by ball milling the ingots and finally obtaining dense bulk by hot pressing. Further improvement in ZT is expected when average grain sizes are made smaller than 100 nm.
Weishu Liu - One of the best experts on this subject based on the ideXlab platform.
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enhancement in thermoelectric figure of merit of an n type half heusler compound by the Nanocomposite Approach
Advanced Energy Materials, 2011Co-Authors: Giri Joshi, Gang Chen, Weishu Liu, Xiao Yan, Hengzhi Wang, Zhifeng RenAbstract:An enhancement in the dimensionless thermoelectric fi gure-of-merit ( ZT ) of an n-type half-Heusler material is reported using a Nanocomposite Approach. A peak ZT value of 1.0 was achieved at 600 ° C‐700 ° C, which is about 25% higher than the previously reported highest value. The samples were made by ball-milling ingots of composition Hf 0.75 Zr 0.25 NiSn 0.99 Sb 0.01 into nanopowders and hot-pressing the powders into dense bulk samples. The ingots were formed by arc-melting the elements. The ZT enhancement mainly comes from reduction of thermal conductivity due to increased phonon scattering at grain boundaries and crystal defects, and optimization of antimony doping.
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enhanced thermoelectric figure of merit of p type half heuslers
Nano Letters, 2011Co-Authors: Xiao Yan, Giri Joshi, Yucheng Lan, Weishu Liu, Sangyeop Lee, Hui Wang, J W Simonson, S J Poon, Gang ChenAbstract:Half-Heuslers would be important thermoelectric materials due to their high temperature stability and abundance if their dimensionless thermoelectric figure of merit (ZT) could be made high enough. The highest peak ZT of a p-type half-Heusler has been so far reported about 0.5 due to the high thermal conductivity. Through a Nanocomposite Approach using ball milling and hot pressing, we have achieved a peak ZT of 0.8 at 700 °C, which is about 60% higher than the best reported 0.5 and might be good enough for consideration for waste heat recovery in car exhaust systems. The improvement comes from a simultaneous increase in Seebeck coefficient and a significant decrease in thermal conductivity due to nanostructures. The samples were made by first forming alloyed ingots using arc melting and then creating nanopowders by ball milling the ingots and finally obtaining dense bulk by hot pressing. Further improvement in ZT is expected when average grain sizes are made smaller than 100 nm.
Zhifeng Ren - One of the best experts on this subject based on the ideXlab platform.
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enhancement in thermoelectric figure of merit of an n type half heusler compound by the Nanocomposite Approach
Advanced Energy Materials, 2011Co-Authors: Giri Joshi, Gang Chen, Weishu Liu, Xiao Yan, Hengzhi Wang, Zhifeng RenAbstract:An enhancement in the dimensionless thermoelectric fi gure-of-merit ( ZT ) of an n-type half-Heusler material is reported using a Nanocomposite Approach. A peak ZT value of 1.0 was achieved at 600 ° C‐700 ° C, which is about 25% higher than the previously reported highest value. The samples were made by ball-milling ingots of composition Hf 0.75 Zr 0.25 NiSn 0.99 Sb 0.01 into nanopowders and hot-pressing the powders into dense bulk samples. The ingots were formed by arc-melting the elements. The ZT enhancement mainly comes from reduction of thermal conductivity due to increased phonon scattering at grain boundaries and crystal defects, and optimization of antimony doping.
