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Estimation of La1-xSrxMnO3(x=0.15～0.5) Emittance by Thermal Irradiation Theory

Estimation of La1-xSrxMnO3(x=0.15～0.5) Emittance by Thermal...

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2012 International Conference on Mechanical Materials and Manufacturing Engineering(ICMMME 2012)

作者： Sara Hatefi Monfared Guangze Tang Xinxin Ma Fereidoun A.Mianji School of Materials Science & Engineering Harbin Institute of Technology National Key Laboratory of Science and Technology on Precision Hot Processing of Metals Harbin Institute of Technology State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology

LaSrMnO(LSMO) has recently shown promising features as a metal-insulator material over a limited range of Sr doping(x=0.175 to 0.25). Its thermal property has been commonly measured through the very expensive calorimetric method. In this paper, a considerably more convenient thermal investigation approach to this issue through the thermal irradiation theory is proposed. LSMO compounds were synthesized with a wide range of x(0.15 to 0.5) using the precisely controlled Pechini sol-gel method. XRD phase structure analysis and XPS composition and chemical state study were adopted for quality assurance of the compounds. Resistance and infrared reflectance of the samples were measured respectively with the help of the four probe technique in temperature range of 150 K to 380 K and an infrared spectrometer over a temperature range of 153 K to 544 K. Investigations showed a good correlation between these two measures approving the metal-insulator characteristic of all the samples. Calculation of the total normal emittance(ε(T)) of the compounds was innovatively simplified using the measured reflectivity data through the thermal irradiation theory for graybody. Moreover, the results showed that every x ratio fabricated through the precisely controlled Pechini method presented a unique ε(T) characteristic with a different metal-insulator transition temperature.

关键词： Composite materials nanostructured matereials Optical properties Rare earth alloys and compounds Sol-gel processes Thermal analysis

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