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IMPEDANCE SPECTROSCOPIC STUDY OF Ca_1-xY_xTi_1-xCo_xO₃ CERAMICS BASED HUMIDITY SENSOR

RAJESH KUMAR KATARE

Department of Physics, Gondar University, Ethiopia

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LAKSHMAN PANDEY

Department of Physics, Rani Durgavati University, Jabalpur 482001, India

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O. P. THAKUR

Electroceramics Group, Solid State Physics Laboratory, Lucknow Road, Delhi 110054, India

Corresponding author.

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OM PARKASH

Department of Ceramic Engineering, Institute of Technology, Banaras Hindu University, Varanasi 221005, India

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, and

DEVENDRA KUMAR

Department of Ceramic Engineering, Institute of Technology, Banaras Hindu University, Varanasi 221005, India

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https://doi.org/10.1142/S0217979205029468Cited by:0 (Source: Crossref)

Abstract

The results of an investigation of humidity sensors based on ceramic material are discussed. It is widely approved that the ceramics based humidity sensor is superior to the polymer one due to their better thermal stability over a variety of chemical species, wide range of operating temperature and rapid response to change of humidity. Properties of humidity sensor based on ceramic system Ca_1-xY_xTi_1-xCo_xO₃ are presented. The role of each part of the sensitive material in the electrical conduction process is determined based on measurements and calculated equivalent circuits. The proposed model describes the water absorption on grain and grain boundaries surfaces with very good fit to the experimental data. A new approach to the modeling of the impedance frequency dependence by means of an equivalent circuit yields very promising results for sensors.

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