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Optical properties of combustion-synthesized iron oxide aggregates

机译:燃烧合成的氧化铁骨料的光学性质

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Measurements of scattering/extinction and asymmetry ratios at both polarization orientations, along with depolarization and reciprocity ratios, corresponding to nanosized Fe_(2)O_(3) aggregates were carried out in an Fe(CO)_(5)-seeded CO air-diffusion flame as a function of the position above the burner surface. The measurements were combined with an exact light-scattering theory to yield, for the first time, the complex refractive index, the primary particle-size parameter, the aspect ratio, and the number density and volume fractions of the Fe_(2)O_(3) chainlike aggregates under flame conditions. An effective complex refractive index of 1.96±6.9% to 0.20±14.5% was inferred from the data analysis at a wavelength of 488 nm and in the temperature range of 894-924K. The corresponding primary particle size was found to be 48 nm ±13%, and the aggregate aspect ratio was in the range of 6-7. Comparisons of the size parameters are made with transmission electron microscopy results, and the possible sources of uncertainties in the inferred results pertaining to temperature, polydispersity effects, and the departure from the straight configuration are discussed.
机译:在Fe(CO)_(5)播种的CO空气中进行了对应于纳米尺寸Fe_(2)O_(3)聚集体的两个极化方向的散射/消光和不对称比的测量,以及去极化和互易比的测量。扩散火焰取决于燃烧器表面上方的位置。将测量结果与精确的光散射理论相结合,首次得出Fe_(2)O_(的复数折射率,初级粒径参数,长宽比以及数密度和体积分数3)火焰条件下的链状聚集体。根据数据分析,在488 nm的波长和894-924K的温度范围内,有效复数折射率为1.96±6.9%至0.20±14.5%。发现相应的一次粒径为48nm±13%,并且聚集体的长径比在6-7的范围内。将尺寸参数与透射电子显微镜结果进行了比较,并讨论了推断结果中与温度,多分散效应和偏离直线构型有关的不确定性来源。

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    《Applied optics》 |2003年第19期|共13页
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