Article ID Journal Published Year Pages File Type
1294285 Solid State Ionics 2012 7 Pages PDF
Abstract

La0.85Sr0.15Ga0.8Mg0.2O3 − δ (LSGM1520) powder is synthesized by a carbonate co-precipitation coupling with azeotropic-distillation process. The composition of the as-prepared precipitate is determined by X-ray diffraction (XRD), elemental analysis (EA), thermogravimetric and differential scanning calorimeter (TG-DSC) and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The post-distilled precursor is submitted to various thermal treatments and characterized by XRD and transmission electron microscopy (TEM). The results show that the components of the powder calcined at 1000 °C contain a main perovskite phase and small amounts of secondary phases (namely LaSrGaO4 and LaSrGa3O7). TEM observation reveals that the powder has a narrow grain size distribution, which turns out to be suitable for sintering (> 97% relative density for a pellet sintered at 1400 °C during 4 h). The conductivity of sintered pellets is measured and the highest conductivity at 800 °C of LSGM1520 is 0.186 S cm− 1, which is nearly three times as high as that of La0.8Sr0.2Ga0.8Mg0.2O3 − δ (0.0644 S cm− 1) prepared by the similar carbonate method. It suggests that a new route of synthesizing Sr- and Mg-doped lanthanum gallate (LSGM) with good sinterability has been developed.

► La0.85Sr0.15Ga0.8Mg0.2O3 − δ were synthesized via carbonate co-precipitation. ► Compositions of the precipitate and the post-distilled powder were determined. ► The precursor was dehydrated by n-butanol azeotropic-distillation technique. ► The maximum conductivity for La0.85Sr0.15Ga0.8Mg0.2O3 − δ pellet is 0.186 S cm− 1.

Related Topics
Physical Sciences and Engineering Chemistry Electrochemistry
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