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Identification and characterization of single crystal Bi_(2)Te_(3-x)Se_(x) alloy 被引量:1
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作者 emina pozega Svetlana IVANOV +4 位作者 Zoran STEVIC Ljiljana KARANOVIC Rudolf TOMANEC Lidija GOMIDZELOVIC Ana KOSTOV 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第10期3279-3285,共7页
The results of experimental investigation of n-type semiconductor based on Bi2Te3 alloy were presented. This material is used in manufacture of thermoelectric coolers and electrical power generation devices. BizTe2.88... The results of experimental investigation of n-type semiconductor based on Bi2Te3 alloy were presented. This material is used in manufacture of thermoelectric coolers and electrical power generation devices. BizTe2.88Se0.12 solid solution single crystal has been grown using the Czochralski method. Monitoring of structure changes of the sample was carried out by electron microscope. The elemental composition of the studied alloy was obtained by energy dispersive spectrometry (EDS) analysis and empirical formula of the compound was established. X-ray diffraction analysis confirmed that the Bi2Te2.88Se0.12 sample was a single phase with rhombohedral structure. The behavior upon heating was studied using differential thermal analysis (DTA) technique. Changes in physical and chemical properties of materials were measured as a function of increasing temperature by thermogravimetric analysis (TGA). The lattice parameters values obtained by X-ray powder diffraction analyses of Bi2Te2.88Se0.12 are very similar to BizTe3 lattice constants, indicating that a small portion of tellurium is replaced with selenium. The obtained values for specific electrical and thermal conductivities are in correlation with available literature data. The Vickers microhardness values are in range between HV 187 and HV 39.02 and decrease with load increasing. It is shown that very complex process of infrared thermography can be applied for characterization of thermoelectric elements and modules. 展开更多
关键词 Bi_(2)Te_(3) Bi_(2)Te_(3-x)Se_(x) single crystal semiconductor thermoelectrical properties hardness thermovision imaging
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Thermodynamics and characterization of shape memory Cu-Al-Zn alloys 被引量:1
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作者 Lidija GOMIDZELOVIC emina pozega +4 位作者 Ana KOSTOV Nikola VUKOVIC Vesna KRSTIC Dragana ZIVKOVIC Ljubisa BALANOVIC 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第8期2630-2636,共7页
The thermodynamic properties and the microstructure, hardness and electrical conductivity of shape memory alloys (SMAs) belonging to ternary Cu?Al?Zn system were studied by Muggianu model and experiment, respectiv... The thermodynamic properties and the microstructure, hardness and electrical conductivity of shape memory alloys (SMAs) belonging to ternary Cu?Al?Zn system were studied by Muggianu model and experiment, respectively. The isothermal section of phase diagram at 293 K was calculated using Thermo-Calc software. Experiments were conducted by X-ray diffraction, light optic microscopy, scanning electron microscopy with energy dispersive X-ray spectrometry, hardness and electrical conductivity measurements. The calculated values of thermodynamic properties indicate that Cu shows good miscibility with Al and Zn in all investigated alloys. The microstructural analysis of samples reveals that the structure consists of large and polygonal grains. 展开更多
关键词 THERMODYNAMICS shape memory alloy Cu-Al-Zn alloys HARDNESS electrical conductivity
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