bullet Sensors & Transducers Journal

    (ISSN 1726- 5479)

205.767

2008 e-Impact Factor

25 Top Downloaded Articles

Journal Subscription 2010

Editorial Calendar 2010

Submit an Article

Editorial Board

Current Issue

Sensors & Transducers journal's cover

Sensors & Transducers Journal 2009

Sensors & Transducers Journal 2008

Sensors & Transducers Journal 2007

2000-2002 S&T e-Digest Contents

2003 S&T e-Digest Contents

2004 S&T e-Digest Contents

2005 S&T e-Digest Contents

2006 S&T e-Digest Contents

 

Best Articles 2009

 

 

 

Vol. 116, Issue 5, May 2010, pp. 21-27

 

Bullet

 

Humidity Sensitivity of MgCr2O4-TiO2-LiO2 Ceramics Sensor Prepared by Sol-Gel Routes

 

H. Y. He

Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education,

Shaanxi University of Science and Technology, (710021), China

Tel.: 0086-15319453608, fax: 0086-29-86168803

E-mail: hehy@sust.edu.cn

 

 

Received: 24 March 2010   /Accepted: 24 May 2010   /Published: 31 May 2010

 

Abstract: 79.5MgCr2O4–19.5TiO2–Li2O porous ceramics were investigated as a humidity sensor. The sensors obtain by a cold isostatic pressing and sintering of the fine MgCr2O4 and TiO2 and LiCO3 powders. The MgCr2O4 and TiO2 powders were respectively synthesized by sol-gel methods. The effects of sintering temperature on the humidity sensitivity of sensors were studied by measuring electrical resistance in different conditions of relative humidity (R.H.) at 27 °C. The results indicated that the calcining temperature obviously affected the resistance variation of the sensor in range of 11.3-84.7 % RH. The resistance variation was small at the calcining temperature of 600 oC for 2 h. With increasing calcining temperature, the resistance variation increased to 5.4×104% and 7.0×104 % at 800 oC and  1000 oC for 2 h, but decreased to 3.1×104 % at 1200 oC for 2 h respectively. The response times are 25 s and 35 s respectively for humidity adsorption and humidity desorption between 11.3 %RH and 84.7 %RH.

 

Keywords: MgCr2O4–TiO2–Li2O, Sol-gel method, Ceramics sensor, Sintering temperature, Humidity sensitivity

 

Acrobat reader logo Click <here> or title of paper to download the full pages article (1.43 Mb)

 

 

 

 


1999 - 2010 Copyright ©, International Frequency Sensor Association (IFSA). All Rights Reserved.


Home - News - Links - Archives - Tools - Standardization - Patents - Marketplace - Projects - Wish List - Subscribe - Search - Membership - Submit Press Release

 Members Area -Sensors Portal -Training Courses - S&T Digest - For advertisers - Bookstore - Forums - Polls - Sensor Jobs - e-Shop - Site Map