Microstructure and ionic conductivity of Sr- and Mg-doped LaGaO3

• Published in: Journal of materials science Vol. 41; no. 13; pp. 4205 - 4213
• Main Authors: Liu, N, Shi, M, Wang, C, Yuan, Y. P, Majewski, P, Aldinger, F
• Format: Journal Article
• Language: English
• Published: Heidelberg Kluwer Academic Publishers 01.07.2006; Springer; Springer Nature B.V
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Electrotechnical and electronic ceramics; energy-dispersive X-ray analysis; Exact sciences and technology; gallium; Grain size; Ion currents; lanthanum; Magnesium; Materials science; microstructure; scanning electron microscopy; strontium; Technical ceramics; Scanning electron microscopy; Electrical conductivity; Electrical properties; Property composition relationship; Ionic conductivity; Doping; Gallium oxide; Experimental study; Gallium Lanthanum Oxides Mixed; X ray diffraction; Oxide ceramics; Magnesium addition; Lanthanum oxide; Solid state reaction; Manufacturing; Microstructure; Strontium addition; Codoping; Electroceramics
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-006-6309-1

Samples of Sr- and Mg-doped LaGaO₃ (LSGM) with various concentrations of Sr and Mg were prepared by using solid-state reaction method. Results show that ionic conductivities increase with the increase of relative densities. It can also be known that the optimized concentration in [Formula: see text] with high conductivity is LSGM1520 or LSGM2015. The results also show that, in various concentrations of LSGM, equiaxed, rode-like, polygonal secondary phases such as LaSrGaO₄ or LaSrGa₃O₇ were detected besides (La,Sr)(Ga,Mg)O₃ by means of SEM and EDX. With the increase of doped elements, i.e. x + y, the grain size increases.