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Gas sensing properties of samarium substituted lithium ferrite

C. DOROFTEI1,2,* , E. REZLESCU2, N. REZLESCU2, P. D. POPA1

Affiliation

  1. University” Al. I. Cuza ” , B-dul Carol I , 11 , 700506, Iasi, Romania
  2. Institute of Technical Physics, B-dul D. Mangeron 47, 700050 Iasi, Romania

Abstract

Microstructure and gas sensitivity of pure and samarium substituted lithium ferrites, Li0.5SmxFe2.5-xO4 (x = 0, 0.05, 0.1 and 0.2), prepared by sol-gel-selfcombustion were studied. As test gases acetone, ethanol, methanol, LPG, butane and ammonia were used. By SEM investigation was evidenced that Sm ions induced microstructural changes in Li ferrite. The finest granulation (bellow 100 nm) and highest porosity (44%) were observed in Li0.5Sm0.2Fe2.3O4. The sensitivity measurements evidenced that the gas sensitivity depends on the working temperature and gas type. All ferrites are sensitive to acetone, ethanol and methanol and less sensitive to ammonia, LPG and butane. The best sensitivities, over 85%, were obtained at operating temperatures of 340 – 3550C for ethanol, methanol and acetone..

Keywords

Ferrites, Substitutes, Structure, Gas sensitivity.

Submitted at: Feb. 16, 2008
Accepted at: Aug. 28, 2008

Citation

C. DOROFTEI, E. REZLESCU, N. REZLESCU, P. D. POPA, Gas sensing properties of samarium substituted lithium ferrite, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 9, pp. 2390-2395 (2008)