Pseudoternary system (Bi2Te3-Sb2Te3-Sb2Se3) ceramic smeiconductor cooling materials were prepared in solid stare reaction with conventional techniques of sintering ceramics. The effect of doping on the properties of t...Pseudoternary system (Bi2Te3-Sb2Te3-Sb2Se3) ceramic smeiconductor cooling materials were prepared in solid stare reaction with conventional techniques of sintering ceramics. The effect of doping on the properties of the material was studied. X-ray diffraction analysis showed that n-p-type materials were solid solutions based on Bi2Te3 and Sb2Te3 respectively. SEM photographs proved that the both types of materials were inhomogeneous and layer structure. The values of fingure of merit for n-type and p-type materials were 3.4 X 10(-3) K-1, respectively. The fabricated thermoelectric modules made of the materials provided excellent cooling effect.展开更多
The low resistance PTC ceramic thermistor material with excellent eleectricalproperties are successfully fabricated by raw materials at industrial range made in our country onthe study of its composition expression an...The low resistance PTC ceramic thermistor material with excellent eleectricalproperties are successfully fabricated by raw materials at industrial range made in our country onthe study of its composition expression and fabrication process by using the addition of Nb, La, Y,Ta , microstructure regulator BN and ASTL phase . The composition and its fabrication method arestudied. The relation of electrical properties of the PTC ceramic material to its compositionexpression and its related electrical properties are discussed展开更多
文摘Pseudoternary system (Bi2Te3-Sb2Te3-Sb2Se3) ceramic smeiconductor cooling materials were prepared in solid stare reaction with conventional techniques of sintering ceramics. The effect of doping on the properties of the material was studied. X-ray diffraction analysis showed that n-p-type materials were solid solutions based on Bi2Te3 and Sb2Te3 respectively. SEM photographs proved that the both types of materials were inhomogeneous and layer structure. The values of fingure of merit for n-type and p-type materials were 3.4 X 10(-3) K-1, respectively. The fabricated thermoelectric modules made of the materials provided excellent cooling effect.
文摘The low resistance PTC ceramic thermistor material with excellent eleectricalproperties are successfully fabricated by raw materials at industrial range made in our country onthe study of its composition expression and fabrication process by using the addition of Nb, La, Y,Ta , microstructure regulator BN and ASTL phase . The composition and its fabrication method arestudied. The relation of electrical properties of the PTC ceramic material to its compositionexpression and its related electrical properties are discussed
