for this application are preparation of precursor powder and powder treatment (calcination and grinding to make it L anthanum strontium manganite L a 0 · 84 Sr 0 · 16 MnO 3 suitable for aqueous tape casting), formulation of slurry (L SM) powder was prepared by combustion synthesis, with binder and tape casting, controlled binder burnout, using a concentrated solution of nitrates of lanthanum, and sintering. strontium, and manganese as oxidiser, and citric acid Various methods have been reported for the synthesis of as fuel. T he as formed powder was found to be crystal-LSM powders, such as sol-gel, coprecipitation and solution line L SM consisting of porous agglomerates of ne combustion.3-9 In solution combustion, a highly porous particles, and exhibited about 7% total weight loss on soft agglomerated product of the oxide compound is formed heating up to 1100°C. Dispersion conditions for wet as a result of the evolution of a large amount of environment grinding of the powder agglomerates calcined at 1100°C friendly gaseous products from the reaction between an were evaluated f rom zeta potential and viscosity studies.oxidiser (metal nitrate) and a fuel (glycine, citric acid, etc.) A maximum zeta potential of 35 mV was noted at a present in the reacting liquid. Parameters such as fuel type pH of 11, while pseudoplasticity of the slurry decreased and fuel to oxidiser ratio have a signi cant in uence on the with decreasing solid concentration. Powder with d 50 kinetics and exothermicity of the reaction, which is an of around 3 mm and free of agglomerates of size greater important factor for safe operation and scaling up of the than 10 mm was formed by wet grinding. Further calciprocess. The present authors have observed that the nitratenation of this powder at 1350°C improved the solids citric acid reaction is smooth without formation of ame, loading in the slurry. T he tape cast slurry composition while the nitrate-glycine reaction is violent leading to ame was optimised for minimum content of binder, plastiformation. ciser, and water with acceptable pseudoplasticity to Formation of LSM using the nitrate-citric acid combusform exible and at tapes. T he dried tapes cut to tion reaction in which the gaseous products formed are required sizes were subjected to controlled binder burnwater, carbon dioxide, and nitrogen can be written as10 out followed by sintering in the range 1350-1450°C. T he sintered at specimens exhibited densities in the 0·84La(NO 3 ) 3 +0·16Sr(NO 3 ) 2 +Mn(NO 3 ) 2 range 65-80% of theoretical, and open porosities in +1·36C 6 H 8 O 7 ! La 0·84 Sr 0·16 MnO 3 +8·16CO 2 the range 35-20%, with a homogeneous distribution of pore phase in the matrix.
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