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Crystalline phase of Y_2O_3 :Eu particles generated in a substrate-free flame process 被引量:4
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作者 Bing Guoa hoon yim +2 位作者 Wonjoong Hwang Matt Nowell Zhiping Luo 《Particuology》 SCIE EI CAS CSCD 2011年第1期24-31,共8页
In this study, factors affecting the crystal structure of flame-synthesized Y2O3 :Eu particles were investigated, especially the particle size effect and its interaction with Eu doping concentration, Polydisperse Y2O... In this study, factors affecting the crystal structure of flame-synthesized Y2O3 :Eu particles were investigated, especially the particle size effect and its interaction with Eu doping concentration, Polydisperse Y2O3:Eu (size range 200 nm to 3μm) powder samples with Eu doping concentrations from 2,5 mol% to 25 mol% were generated in either H2/air or H2/O2 substrate-free flames. The crystal structure of the powder samples was determined by powder X-ray diffraction (XRD), which was complemented by pho- toluminescence (PL) measurements. Single particle crystal structure was determined by single particle selected area electron diffraction (SAED), and for the first time, by electron backscatter diffraction (EBSD). H2/air flames resulted in cubic phase Y2O3:Eu particles with hollow morphology and irregular shapes, Particles from H2/O2 flames had dense and spherical morphology; samples with lower Eu doping concen- trations had mixed cubic/monoclinic phases; samples with the highest Eu doping concentrations were phase-pure monoclinic. For samples generated from H2/02 flames, a particle size effect and its interaction with Eu doping concentration were found: particles smaller than a critical diameter had the monoclinic phase, and this critical diameter increased with increasing Eu doping concentration, These findings suggest that the formation of monoclinic Y2O3:Eu is inevitable when extremely hot substrate-free flames are used, because typical flame-synthesized Y203 :Eu particle sizes are well below the critical diameter, However, it may be possible to generate particles with dense, spherical morphology and the desired cubic structure by using a moderately high flame temperature that enables fast sintering without melting the particles. 展开更多
关键词 Flame synthesis Aerosol Size effect Crystal structure Y2O3:Eu Particles
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