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LJournal of Alloys and Compounds 306 (2000) 103112 www.elsevier.com/locate/jallcom

Summary: LJournal of Alloys and Compounds 306 (2000) 103­112
Microstructural evolution in B-site Mg-substituted La Sr GaO oxide0.9 0.1 32d
solid solutions
*Abdul-Majeed Azad , Liew Foo Er
Department of Physics, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
Received 29 April 1999; received in revised form 14 January 2000; accepted 29 January 2000
Compositions with substitution both at A and B site of the host LaGaO system were synthesized via conventional solid-state reaction3
31 21 31
route. The substitution at A (La ) site was fixed at 10 mole % Sr , while that at B (Ga ) site was varied between 20 mole % and 50
mole % Mg . Cylindrical compacts were sintered using various temperature (T)­soak-time (t) profiles in the range 1200­14008C and
2­72 h. X-ray analyses showed that up to 40 mole % MgO can go into the host lattice without resulting in new phases. Sintered bodies
with higher amount of the dopant showed microstructures with mixed morphology, indicating that solid-solubility limit could have been
exceeded. Microstructural examination also revealed that a soak-time of about 6 h at 14008C was adequate to achieve benign
microstructure in 20 mole % MgO-doped LaGaO . © 2000 Published by Elsevier Science S.A. All rights reserved.3
Keywords: Lanthanum gallate; Magnesium oxide; Strontium oxide; Solid electrolyte; Microstructure
1. Introduction (iii) evaporation and interaction of the interconnect
(substituted lanthanum chromite, LaCrO ) with YSZ.3


Source: Azad, Abdul-Majeed - Department of Chemical and Environmental Engineering, University of Toledo


Collections: Materials Science; Energy Storage, Conversion and Utilization