NDLI: Morphological and Humidity Sensing Investigations on Niobium, Neodymium, and Lanthanum Oxides

Content Provider	IEEE Xplore Digital Library
Author	Yadav, B.C. Singh, M.
Copyright Year	2001
Abstract	This paper reports a comparative study of moisture sensing properties of niobium penta oxide, neodymium oxide, and lanthanum oxides. Pellets of these materials were made by using hydraulic pressing machine (M.B. Instruments, New Delhi, India) at a pressure of 616 MPa. These pellets were used as sensing elements and thermally annealed at temperatures 200°C and 400°C successively. After each step of annealing, the sensing element was put within a conventionally designed conductivity holder and exposed to humidity inside a controlled humidity chamber. Variations in resistance with the relative humidity were recorded for each sensing elements made of Nb₂O₅ , Nd₂O₃ , and La₂O₃ , respectively. Sensitivities of samples were compared at different annealing temperatures. Maximum values of sensitivities and linear response of sensors were obtained for samples annealed at 400 ^°C. Lanthanum oxide revealed the highest sensitivity 20 MΩ/%RH in comparison to other samples. Morphological and X-ray diffraction studies of the samples were performed. Results were found reproducible within ±5% error. No ageing effect was observed during three months.
Sponsorship	IEEE Sensors Council
Starting Page	1759
Ending Page	1766
Page Count	8
File Size	1579525
File Format	PDF
ISSN	1530437X
Volume Number	10
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Humidity Niobium Neodymium Lanthanum Annealing Temperature sensors Moisture Pressing Instruments Conductivity sensitivity Adsorption ceramic humidity sensor resistivity
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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