Strontium-doped hematite as a possible humidity sensing material for soil water content determination
Articolo
Data di Pubblicazione:
2013
Abstract:
The aim of this work is to study the sensing behavior of Sr-doped hematite for soil water content measurement. The material was prepared by solid state reaction from commercial hematite and strontium carbonate heat treated at 900 °C. X-Ray diffraction, scanning electron microscopy and mercury intrusion porosimetry were used for microstructural characterization of the synthesized powder. Sensors were then prepared by uniaxially pressing and by screen-printing, on an alumina substrate, the prepared powder and subsequent firing in the 800–1,000 °C range. These sensors were first tested in a laboratory apparatus under humid air and then in an homogenized soil and finally in field. The results evidenced that the screen printed film was able to give a response for a soil matric potential from about 570 kPa, that is to say well below the wilting point in the used soil
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
hematite; strontium hexaferrite; humidity sensor; soil water content determination
Elenco autori:
Tulliani J.-M.; Baroni C.; Zavattaro L.; Grignani C.
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