Sensors & Transducers Journal
(ISSN 1726- 5479)
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205.767 |
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(ISSN 1726- 5479) |
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Vol. 137, Issue 2, February 2012, pp. 145-154
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Electrical and Humidity Sensing Study of Nanocrtsyallite Mg-Cd Ferrites
a Ashok B. Gadkari, b Tukaram J. Shinde, c Pramod N. Vasambekar *a Department of Physics and Electronics, GKG College, Kolhapur – 416012, (MS) India b Department of Physics, KRP Kanya Mahavidylaya, Isalmpur – 415409, (MS) India c Department of Electronics, Shivaji University, Kolhapur - 416004, (MS) India * Tel.: 09423814704, * e-mail: ashokgadkari88@yahoo.com
Received: 15 January 2012 /Accepted: 14 February 2012 /Published: 28 February 2012 |
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Abstract: Nanocrystallite Mg-Cd ferrite samples were prepared by oxalate co-precipitation method. The XRD reveals single phase cubic spinel nature of materials. The crystallite size lies in the range of 27.79 to 30.4 nm. DC electrical resistivity decreases with increasing temperature indicating the semiconductor behavior. The DC electrical resistivity increases and the Curie temperature decreases with increase in cadmium content. All the samples show decrease in resistivity with increase in relative humidity. All the samples are humidity sensitive in low humidity range (40 to70 %). The electrical resistivity of Cd substituted samples decreased by three order of magnitude, when %RH increased from 40%RH to 90%RH. The response and recovery time of all the samples are 200-300 sec. The shorter response time was 240 s for composition x = 0.4.
Keywords: Humidity sensor, Sensitivity, DC resistivity, Activation energy
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