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首页> 外文期刊>Materials Science and Engineering. B, Solid-State Materials for Advanced Technology >Small-angle neutron scattering investigations on fractal aggregation and sintering behavior of La_(1-x)Ca_xCrO_3 synthesized by a combustion process
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Small-angle neutron scattering investigations on fractal aggregation and sintering behavior of La_(1-x)Ca_xCrO_3 synthesized by a combustion process

机译：小角中子散射研究燃烧过程合成的La_（1-x）Ca_xCrO_3的分形聚集和烧结行为

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摘要

La_(1-x)Ca_xCrO_3 (x=0.3) powder has been synthesized by gel combustion process. Fractal behavior of the agglomerates and pore morphology of the sintered compacts have been studied by small-angle neutron scattering. At low scattering vector (q) regime the 'q~(Df)' power law variation of intensity of the powder sample and the green compact indicates that the powder particles are agglomerates and are composed of fractal aggregates. The value of the mass fractal dimension D_f of these aggregates was found to be ～2.2. The Porod exponent of the scattering profiles of the sintered specimens shows deviation from its normal value of -4 to ～-3. This has been attributed due to superposition of scattering intensities from fine intra-granular pores on the scattering intensity from inter-granular pores. Loss of fractal structure of the aggregates upon heat treatment of the compacts at higher temperature has been observed. The pore size distribution gradually shifts towards higher radius size with the increase in sintering temperature due to faster elimination of finer pores.
机译：通过凝胶燃烧法合成了La_（1-x）Ca_xCrO_3（x = 0.3）粉末。通过小角度中子散射研究了团聚体的分形行为和烧结体的孔隙形态。在低散射矢量（q）态下，粉末样品和生压坯强度的“ q〜（Df）”幂定律变化表明粉末颗粒是团聚物，由分形聚集体组成。发现这些聚集体的质量分形维数D_f为〜2.2。烧结样品的散射曲线的Porod指数显示出偏离其正常值-4至〜-3的范围。这归因于来自细颗粒内孔的散射强度与来自颗粒间孔的散射强度的叠加。已经观察到在较高温度下对压坯进行热处理时，聚集体的分形结构损失。随着烧结温度的升高，由于更快地消除了较细的孔，孔尺寸分布逐渐朝着较大的半径尺寸移动。

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