The effects of hot pressing on electric performance and mechanical strength of Bi_(0.5)Sb_(1.5)Te_(3) thermoelectric material prepared through vacuum melting and milling were studied.The phase constituent and microstr...The effects of hot pressing on electric performance and mechanical strength of Bi_(0.5)Sb_(1.5)Te_(3) thermoelectric material prepared through vacuum melting and milling were studied.The phase constituent and microstructure were analyzed by X-ray Diffraction and cold field emission Scanning Electric Microscope.Aeolotropisms of the material on microstructure and electric performances are approved.With the rise of hot pressing temperature(from 300-500℃)and pressure(30-70 MPa),electric conductivity and power factor are improved.Moreover,Bi_(0.5)Sb_(1.5)Te_(3) material can gain ideal thermoelectric performances and increased mechanical strength by hot pressing.展开更多
Thermoelectric(TE)materials are a kind of functional materials which can be used to convert directly heat energy to electricity or reversely.The thermoelectric effects hold great potential for application in power gen...Thermoelectric(TE)materials are a kind of functional materials which can be used to convert directly heat energy to electricity or reversely.The thermoelectric effects hold great potential for application in power generation and refrigeration.Bi_(2)Te_(3)and its alloys are well known as best TE materials currently available near room temperature.This paper studies respectively the effects of spark plasma sintering(SPS)on electric performance of Bi_(0.5)Sb_(1.5)Te_(3)thermoelectric materials that are prepared through vacuum melting and ball milling.Through X-ray Diffraction and cold field emission scanning electric microscope s4800,the phase constituent and microstructure of the TE materials samples were analyzed.Electric conductivity and power factor can be improved with the rise of Spark Plasma Sintering temperature(from 300 to 500℃)and pressure(from 30 to 60 MPa),and the density and mechanical strength of Bi_(0.5)Sb_(1.5)Te_(3)thermoelectric material increase,too.展开更多
In order to improve the cycling stability of La-Mg-Ni-Co hydrogen storage alloys, the La0.7Mg0.3 （Ni0.85Co0.15）3.5 alloy was prepared by inductive melting under argon atmosphere. The effect of additive CoO on electr...In order to improve the cycling stability of La-Mg-Ni-Co hydrogen storage alloys, the La0.7Mg0.3 （Ni0.85Co0.15）3.5 alloy was prepared by inductive melting under argon atmosphere. The effect of additive CoO on electrochemical properties of La0.7Mg0.3（Ni0.85 Co0.15）3.5 alloy, which is used as an electrode material was studied. When the addition of CoO is 5 %, both the discharge capacity at high-, low- and room-tem- perature and charge-discharge cycling stability at room temperature can be significantly improved. Electro- chemical measurements and X-ray diffraction （XRD） analyses suggest that CoO improves the electrochemical properties of the La0.7Mg0.3（Ni0.85Co0.15）3.5 alloy by promoting the electrochemical reaction of another phase in the alloy and by self electrochemical reversible reaction occurring during the charge-discharge process.展开更多
文摘The effects of hot pressing on electric performance and mechanical strength of Bi_(0.5)Sb_(1.5)Te_(3) thermoelectric material prepared through vacuum melting and milling were studied.The phase constituent and microstructure were analyzed by X-ray Diffraction and cold field emission Scanning Electric Microscope.Aeolotropisms of the material on microstructure and electric performances are approved.With the rise of hot pressing temperature(from 300-500℃)and pressure(30-70 MPa),electric conductivity and power factor are improved.Moreover,Bi_(0.5)Sb_(1.5)Te_(3) material can gain ideal thermoelectric performances and increased mechanical strength by hot pressing.
文摘Thermoelectric(TE)materials are a kind of functional materials which can be used to convert directly heat energy to electricity or reversely.The thermoelectric effects hold great potential for application in power generation and refrigeration.Bi_(2)Te_(3)and its alloys are well known as best TE materials currently available near room temperature.This paper studies respectively the effects of spark plasma sintering(SPS)on electric performance of Bi_(0.5)Sb_(1.5)Te_(3)thermoelectric materials that are prepared through vacuum melting and ball milling.Through X-ray Diffraction and cold field emission scanning electric microscope s4800,the phase constituent and microstructure of the TE materials samples were analyzed.Electric conductivity and power factor can be improved with the rise of Spark Plasma Sintering temperature(from 300 to 500℃)and pressure(from 30 to 60 MPa),and the density and mechanical strength of Bi_(0.5)Sb_(1.5)Te_(3)thermoelectric material increase,too.
文摘In order to improve the cycling stability of La-Mg-Ni-Co hydrogen storage alloys, the La0.7Mg0.3 （Ni0.85Co0.15）3.5 alloy was prepared by inductive melting under argon atmosphere. The effect of additive CoO on electrochemical properties of La0.7Mg0.3（Ni0.85 Co0.15）3.5 alloy, which is used as an electrode material was studied. When the addition of CoO is 5 %, both the discharge capacity at high-, low- and room-tem- perature and charge-discharge cycling stability at room temperature can be significantly improved. Electro- chemical measurements and X-ray diffraction （XRD） analyses suggest that CoO improves the electrochemical properties of the La0.7Mg0.3（Ni0.85Co0.15）3.5 alloy by promoting the electrochemical reaction of another phase in the alloy and by self electrochemical reversible reaction occurring during the charge-discharge process.
