Impact of Microstructure on Humidity Influence on Complex Impedance of Iron Manganite
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2020
Authors
Nikolić, Maria Vesna
Vasiljević, Zorka Ž.

Dojčinović, Milena

Vujančević, Jelena

Radovanović, Milan
Conference object (Published version)

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This work deals with our continued research of oxide materials for potential application in gas/humidity sensing. We have made thick film samples using iron manganite powder synthesized by a sol-gel combustion method with a net-like structure, by screen printing on alumina substrate with PdAg interdigitated electrodes. The thick film samples were fired at two temperatures 600 and 800°C. The powder morphology was retained and only the organic compounds in the paste were burnt-out at 600°C, while at 800°C the thick film surface morphology was different where grain growth and individual particles can be observed. We measured complex impedance in a temperature and humidity chamber at room temperature (25°C) in the relative humidity range 30 – 90 % and frequency 100 Hz - 1 MHz. The thick film surface morphology has a significant influence on the effect of humidity on complex impedance. The complex impedance of thick films fired at 600°C was high and did not decrease noticeably with increase... in relative humidity (RH), except for RH 80 and 90%, while thick film samples fired at 800°C had an overall lower impedance that reduced more noticeably with increase in RH 40–70% and even more for RH 80 and 90%.
Keywords:
iron manganite / thick films / complex impedance / relative humiditySource:
2020 43rd International Spring Seminar on Electronics Technology (ISSE), 2020, 1-5Publisher:
- IEEE
Projects:
- Ministry info:eu-repo/grantAgreement/MESTD/inst-2020/200053/RS// (RS-200053)
- Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200175 (Institute of Technical Sciences of SASA, Belgrade) (RS-200175)
- Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200156 (University of Novi Sad, Faculty of Technical Science) (RS-200156)
Note:
- Peer-reviewed manuscript: https://dais.sanu.ac.rs/handle/123456789/8965
DOI: 10.1109/ISSE49702.2020.9120967
ISBN: 978-1-7281-6773-2