Studies on thermally treated lanthanum-iron (atomic ratio 1:9) oxyhydroxide

Mossbauer spectral (MS) and magnetic investigations on the products obtained by annealing coprecipitated La(III) and Fe(III) (atomic ratio 1:9) oxyhydroxide gel to different temperatures in the range 100 to 1250 degree C are reported. The annealing temperatures were chosen on the basis of thermal an...

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Bibliographic Details
Published in:Journal of materials science 1989-06, Vol.24 (6), p.2132-2134
Main Authors: SARASWAT, I. P, RAO, G. S, SHARMA, C. L, GARG, V. K, VAJPEI, A. C
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Emulsions. Microemulsions. Foams
Exact sciences and technology
General and physical chemistry
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Summary:Mossbauer spectral (MS) and magnetic investigations on the products obtained by annealing coprecipitated La(III) and Fe(III) (atomic ratio 1:9) oxyhydroxide gel to different temperatures in the range 100 to 1250 degree C are reported. The annealing temperatures were chosen on the basis of thermal analysis data. It is observed that the thermal behavior of the bulk ferric gel is significantly influenced by La(III) incorporation. A quadrupole split doublet observed in the MS of the gel annealed from 100 degree C persists up to 570 degree C and for samples annealed from 850 degree C and above it is not discernable. However, a six-fingered hyperfine split pattern emerges even for the gel heated to 150 degree C indicating the onset of short-range ordering.
ISSN:0022-2461
1573-4803
DOI:10.1007/BF02385432