Synthesis and Characterization of Sr‐ and Mg‐Doped LaGaO₃ Tapes

Abstract

The study focuses the processing of La 1Àx Sr x Ga 1Ày Mg y O 3Àd (LSGM) tapes and the characterization of their microstructure, chemical composition, and sinter behavior during annealing. Dilatometric runs show that sintering of the tapes conclude at about 15001C. This finding correlates with the observed sharp increase of the crystallinity of LSGM at higher temperatures. The porosity of the tapes has been found to be minimum at 15251C. Increasing sintering temperatures cause a loss of Sr, Mg, and Ga, which is presumably due to evaporation of the elements. The Vickers hardness of the tapes sintered at 15001C was measured to be about 900.

Nanometric La0.9Sr0.1Ga0.8Mg0.2O3−x ceramic prepared by low-pressure reactive spark-plasma-sintering

“…From all the sintering methods only the last one allowed formation of dense LSGM ceramic with particle size below 100 nm [10,12]. (c) Reports indicate on evaporation of Sr, Ga and Mg from LSGM at high temperatures [13] and of Ga and Mg at intermediate temperatures and in environments specific for SOFC working conditions [14]. Other general electrical and thermomechanical requirements for an electrolyte are presented in Ref.…”

Low-temperature sintering and electrical properties of strontium- and magnesium-doped lanthanum gallate with V2O5 additive

“…At relatively low sintering temperatures, the specimen density is poor and various intermediate phases form due to the complexity in cations [7,8]. Specimen densification up to gas impermeable level can be achieved at a high sintering temperature of ∼1500 • C [9]. The interdiffusion of La and Ni components from the Ni-based anode and LSGM electrolyte leads, however, to the formation of a resistive interface phase such as LaNiO 3 [10], which deteriorates the SOFC performance.…”

Atmospheric plasma-sprayed La0.8Sr0.2Ga0.8Mg0.2O3 electrolyte membranes for intermediate-temperature solid oxide fuel cells

“…1 However, the fabrication of LSGM into a thin, dense membrane faces two challenges: segregation of secondary phases (e.g., LaSrGaO 4 and LaSrGa 3 O 7 ) during synthesis 15 and a high sintering temperature ($1500 C) necessary to obtain sufficient density. 16 For example, a solid-state sintering process may require a sintering temperature as high as 1500 C and a sintering time as long as 10 h. Such sintering conditions may lead to abnormal grain growth, dramatically degrading its mechanical properties and structural integrity. Also, it is difficult to prepare a thin electrolyte membrane supported by an electrode (either anode or cathode) because of the potential electrolyte-electrode reactions under the sintering conditions.…”