Strontium doped lanthanum gallates

A. Ctineyt Ta , Peter J. Majewski, Fritz Aldinger, Chemical preparation of pure and strontium- and/or magnesium-doped lanthanum gallate powders , Journal of American Ceramic Society 83[12], 2954-2960 (2000). 

Silicate apatite conductivity compared to that of YSZ, GDC (gadolinium-doped ceria) and LSGM (lanthanum- and strontium-doped magnesium gallate) (Marero-Lopez etai, 2010). 

Since complicated multicomponent ceramic materials with precise levels of doping are required for some of the new materials that show promise in solid oxide fuel cells, we aim to use the relatively low-cost, simple steric entrapment method to synthesize several solid oxide fuel cell materials, and evaluate some of their characteristics. We have selected lanthanum gallates doped with strontium and magnesium, samarium doped ceria and a promising non-stoichoimetric composition composed of strontium iron and cobalt. 

Lanthanum gallate is doped with divalent metal ions, for instance, strontium and magnesium Lai jSrjMgyGai j,03 usually, x and y have values between 1 and 0. Unlike the ceria-based electrolytes, this electrolyte can also be used at low oxygen partial pressures without the menace of developing an electronic conductivity. When in contact with cathodes of the LSM- or LSC type, some diffusion of manganese and cobalt from the cathode into the electrolyte is possible, but this has little effect on the fuel cell s performance. A certain defect of this electrolyte material is its complicated preparation procedure. 

Huang, P., and Petrie, A. (1996). Superior oxygen ion conductivity of lanthanum gallate doped with strontium and magnesium. J Electrochem Soc. 143 1644-1648. 

A substantially more conductive material that is stable in air and hydrogen was discovered by Goodenough (9). Lanthanum gallate with strontium doping on the A-site of the perovskite and magnesium on the B-site could be used at temperatures as low as 600 °C even on a thick electrolyte. Laboratory fuel cells with this electrolyte have been tested, but the typical... 

The materials that have been studied the most are yttria stabilized zirconia, doped ceria with gadolinium and lanthanum gallate doped with strontium and magnesium. The solid oxide fuel cells can, in principle, operate in a wide temperature range between 500 °C and... 

Lanthanum gallate-based perovskite oxide is selected as the electrolyte material for high-performance cells. Strontium is used as a dopant to the A site, and magnesium together with cobalt are doped to the B site of the... 

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