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分别用低温固相反应、高温固相反应和激光快速凝固技术(LRS)合成了固体氧化物燃料电池电解质材料La0.9Sr0.1Ga0.8Mg0.2O3-δ(LSGM),用Raman谱和X射线衍射研究了三组样品的晶体结构。三组样品Raman谱的明显差异表明它们分别属于三种不同的晶体结构。实验Raman谱与计算的三种可能晶体结构(立方、单斜和正交)Γ点声子模的比较表明:通过激光快速凝固法和低温、高温固相反应法制备的三组样品分别属于正交、立方和单斜结构。通过对这三组样品的XRD谱的结构精修,进一步证实了Ra-man光谱分析的结果。
The solid oxide fuel cell electrolyte La0.9Sr0.1Ga0.8Mg0.2O3-δ (LSGM) was synthesized by low temperature solid state reaction, high temperature solid state reaction and laser rapid solidification (LRS) respectively. The Raman spectra and X-ray diffraction The crystal structure of three samples was studied. The obvious difference of the Raman spectra of the three groups of samples indicates that they belong to three different crystal structures respectively. Comparison of experimental Raman spectra and calculated Γ point phonon modes of three possible crystal structures (cubic, monoclinic and orthogonal) shows that three groups of samples prepared by laser rapid solidification and low temperature and high temperature solid state reaction respectively belong to positive AC, cubic and monoclinic structures. Through the structural refinement of the XRD spectra of the three groups of samples, the results of Ra-man spectral analysis were further confirmed.