Combustion synthesis and properties of strontium substituted lanthanum manganites $La_1_-_x$$Sr_x$$MnO_3$ (0\leq x\leq0.3)

Aruna, Singanahally T and Muthuraman, Meiyappan and Patil, Kashinath C (1997) Combustion synthesis and properties of strontium substituted lanthanum manganites $La_1_-_x$$Sr_x$$MnO_3$ (0\leq x\leq0.3). In: Journal Of Materials Chemistry, 7 (12). pp. 2499-2503.

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Abstract

Strontium substituted lanthanum manganites La1-xSrxMnO3 (x = 0, 0.1, 0.16, 0.2 and 0.3) have been prepared by a solution combustion process using lanthanum nitrate, strontium nitrate and manganese nitrate as oxidizers and oxalyl dihydrazide as fuel at 300 degrees C in a pre-heated muffle furnace. As-formed lanthanum manganites are X-ray crystalline showing cubic symmetry. The cubic LaMnO3, with 36% Mn4+ changes to a rhombohedral phase (Mn4+=28%) on calcination at 1000 degrees C. The surface area and average agglomerated particle size of the as-formed manganites are in the range 12-19 m(2) g(-1) and 5.4-8.0 mu m, respectively. Sintering, thermal expansion and de electrical conductivity measurements of La(Sr)MnO3, have been carried out. Strontium substituted lanthanum manganites achieve > 80% theoretical density after sintering at 1350 degrees C for 4 h and the percentage theoretical density decreases with increasing strontium content. The thermal expansion coefficient of La(Sr)MnO, increases with increasing Sr2+ content and La0.84Sr0.16MnO3 shows a highest conductivity value of 202 S cm(-1) at 900 degrees C in air.

Item Type:	Journal Article
Publication:	Journal Of Materials Chemistry
Publisher:	Royal Society of Chemistry
Additional Information:	Copyright of this article belongs to Royal Society of Chemistry.
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	11 Mar 2009 08:57
Last Modified:	19 Sep 2010 05:25
URI:	http://eprints.iisc.ac.in/id/eprint/18712

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