Full-Heusler Fe_(2)VAl alloy has received significant attention for thermoelectric(TE)applications due to its high mechanical strength,favorable electrical transport behavior,and earth-abundant constituent elements.Ho...Full-Heusler Fe_(2)VAl alloy has received significant attention for thermoelectric(TE)applications due to its high mechanical strength,favorable electrical transport behavior,and earth-abundant constituent elements.However,its intrinsically high lattice thermal conductivity hinders the enhancement of the figure of merit(zT).In this study,a series of bulk materials with the nominal composition of Fe_(2)V_(1+x)Al_(1-x)(x=0-0.21)were prepared by the arc-melting method.Effects of substituting Al site with V on the phase composition,microstructure,band structure,and TE transport properties were systematically investigated.All materials exhibit a single phase with a partially disordered B2 structure.V-doping shifts the Fermi level into the conduction band,significantly enhancing the carrier concentration,and resulting in a high power factor of 4.5 mW·K^(-2)·m^(-1).Additionally,the lattice thermal conductivity is substantially reduced due to enhanced phonon scattering induced by the mass and stress fluctuations.Ultimately,a maximum zT of 0.14 is achieved for the material with x=0.15,which is nearly 280 times larger than that of undoped Fe_(2)VAl.This work demonstrates that substituting Al site with V can effectively improve the TE performance of Fe_(2)VAl alloy.展开更多
目的:研究海南地区汉族人群、黎族人群、脑梗死患者、冠心病患者FⅧ val 34Leu分布特点。方法:用聚合酶链反应、限制性片段长度多态性分析及核苷酸顺序测定检测205名汉族正常人、236名黎族正常人、196例脑梗死患者、188例冠心病患者(心...目的:研究海南地区汉族人群、黎族人群、脑梗死患者、冠心病患者FⅧ val 34Leu分布特点。方法:用聚合酶链反应、限制性片段长度多态性分析及核苷酸顺序测定检测205名汉族正常人、236名黎族正常人、196例脑梗死患者、188例冠心病患者(心肌梗死/非心肌梗死,55/133)FⅩⅢA链 Val 34 Leu多态性。结果:汉族人群、黎族人群、脑梗死组未发现Val 34 Leu多态性,在冠心病组中发现1例Val 34 Leu杂合子。结论:FⅧ Val 34 Leu变异在中国人群中不是多态性,与缺血性心脑血管疾病没有关联,不是中国人群中防止动脉血栓性疾病的保护性因素。展开更多
基金National Natural Science Foundation of China(52130203,92463310,52201256)Guangdong Basic and Applied Basic Research Foundation(2022B1515120005)。
文摘Full-Heusler Fe_(2)VAl alloy has received significant attention for thermoelectric(TE)applications due to its high mechanical strength,favorable electrical transport behavior,and earth-abundant constituent elements.However,its intrinsically high lattice thermal conductivity hinders the enhancement of the figure of merit(zT).In this study,a series of bulk materials with the nominal composition of Fe_(2)V_(1+x)Al_(1-x)(x=0-0.21)were prepared by the arc-melting method.Effects of substituting Al site with V on the phase composition,microstructure,band structure,and TE transport properties were systematically investigated.All materials exhibit a single phase with a partially disordered B2 structure.V-doping shifts the Fermi level into the conduction band,significantly enhancing the carrier concentration,and resulting in a high power factor of 4.5 mW·K^(-2)·m^(-1).Additionally,the lattice thermal conductivity is substantially reduced due to enhanced phonon scattering induced by the mass and stress fluctuations.Ultimately,a maximum zT of 0.14 is achieved for the material with x=0.15,which is nearly 280 times larger than that of undoped Fe_(2)VAl.This work demonstrates that substituting Al site with V can effectively improve the TE performance of Fe_(2)VAl alloy.
文摘目的:研究海南地区汉族人群、黎族人群、脑梗死患者、冠心病患者FⅧ val 34Leu分布特点。方法:用聚合酶链反应、限制性片段长度多态性分析及核苷酸顺序测定检测205名汉族正常人、236名黎族正常人、196例脑梗死患者、188例冠心病患者(心肌梗死/非心肌梗死,55/133)FⅩⅢA链 Val 34 Leu多态性。结果:汉族人群、黎族人群、脑梗死组未发现Val 34 Leu多态性,在冠心病组中发现1例Val 34 Leu杂合子。结论:FⅧ Val 34 Leu变异在中国人群中不是多态性,与缺血性心脑血管疾病没有关联,不是中国人群中防止动脉血栓性疾病的保护性因素。
