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Role of modified active surface sites of magnesium ferrite for humidity sensing

R. K. KOTNALA1,* , JYOTI SHAH1, M. C. MATHPAL1, DEVINDER GUPTA1, L. P. PUROHIT2, HARI KISHAN1

Affiliation

  1. Magnetic Materials and measurement Group, National Physical Laboratory, India
  2. Gurukul Kangri Vishwavidyalaya Haridwar India

Abstract

Humidity response of Mg1-x/2Li x/4Cex/4Fe2O4 (0.0 ≤ x ≥ 0.4) was studied in the range 20% - 80% RH using standard humidity generator. The LiCe substitution in magnesium ferrite decreased the grain size and pore size distribution of magnesium ferrite. The pore size distribution in the sample prepared was decreased from 40nm to 10nm and bulk porosity increased to 41% for x = 0.2 composition. Shortest adsorption humidity response time was recorded 90s for x = 0.2 compared to MgFe2O4 sample. The adsorption-desorption humidity hysteresis curves were plotted for all samples, the area enclosed in it was extremely small. Spinel structure of the ferrite compound was confirmed by XRD peaks presence and the defective structure of the spinel compound was analyzed with Raman spectra of the different samples..

Keywords

Magnesium Ferrite, Defective Structure, Scanning Electron Microscopy (SEM), Humidity Sensing, Humidity Hysteresis.

Submitted at: March 3, 2009
Accepted at: March 24, 2009

Citation

R. K. KOTNALA, JYOTI SHAH, M. C. MATHPAL, DEVINDER GUPTA, L. P. PUROHIT, HARI KISHAN, Role of modified active surface sites of magnesium ferrite for humidity sensing, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 3, pp. 296-301 (2009)