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Fabrication and the Research of Properties of Doped Lanthanum Manganese Material

Author: YanShiZuo
Tutor: ZhouYang
School: Beijing Jiaotong University
Course: Materials Science
Keywords: Perovskite La1-xBxMnO3 Preparation Structure Physical properties Infrared emissivity rate of
CLC: TQ174.1
Type: Master's thesis
Year: 2010
Downloads: 143
Quote: 1
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Abstract


Doped rare-earth manganese Oxides material was originally yes because of its has a wealth of magnetic learn nature of while the suffer attach importance to , 20 sixties of last century Zeng on its crystal structure, magnetic learn nature and resistivity rate changes has done system research , while the 90 years after the but also to its giant magnetoresistance effect conducted a lot of research. Nowadays , and also because -doped manganese acid lanthanum materials can be according to temperature change their infrared emissivity rate the nature of the , become the current domestic and international research intelligent thermal control material hot spots. This thesis explores the dopant LaMnO3 material preparation process of , and studied the doped LaMnO3 the material's crystalline structure, the basic physical properties of , resistivity, and infrared emissivity rate and other properties. Research contents include: ( 1 ) research high-purity La1-xBxMnO3 (B = Sr, Ca , etc. ) powders the synthesis of craft . ( 2 ) research high-quality La1-xBxMnO3 (B = Sr, Ca , etc. ) block body sintering process . ( 3 ) take advantage of XRD, SEM, physical performance test systems (PPMS) and other analytical means and technologies , right -doped LaMnO3 materials the crystal structure and microcosmic structure of conducted a analysis and observation , and its density, hardness, resistivity rate of - temperature curve , the phase transition temperature and other physical properties conducted , a test and analysis of . ( 4 ) take advantage of dual-band emission rate measuring instrument pairs of -doped LaMnO3 materials 's infrared emissivity rate performance of conducted a research and analysis. Studies The results showed that: can be used suitable process prepared by out the price and quality dopant LaMnO3 materials . Substantially La1-xBxMnO3 (B = Sr, Ca , etc. ) the material's crystalline structure, ie, unit cell size and doping amount is inversely proportional to , its room temperature for infrared emissivity to its unit cell proportional to the size , while its the phase change temperature and its unit cell size into inversely proportional to the .

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