NDLI: Selectivity and composition dependence of response of gas-sensitive resistors. Part 1.—Propane–carbon monoxide selectivity of Ba6FexNb10 –xO30(1 x 2)

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Selectivity and composition dependence of response of gas-sensitive resistors. Part 1.—Propane–carbon monoxide selectivity of Ba₆Fe_xNb_{10 –x}O₃₀(1 x 2)

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Selectivity and composition dependence of response of gas-sensitive resistors. Part 1.—Propane–carbon monoxide selectivity of Ba₆Fe_xNb_{10 –x}O₃₀(1 x 2)

Content Provider	Royal Society of Chemistry (RSC)
Author	Gellman, L. J. Williams, D. E. Henshaw, G. S.
Copyright Year	1994
Abstract	A series of tetragonal tungsten bronze structure compounds of formula Ba6FexNb10 –xO30(1 < x < 2) have been made and characterised by X-ray powder diffraction and electron microprobe analysis. The compounds were ostensibly single-phase materials, but since their electrical conductivity did not vary with composition, their structure was interpreted as being Ba6FeNb9O30 with intergrowths of, possibly, BaFe2O4. The gas-sensing behaviour to propane and carbon monoxide was investigated. The compounds were n-type semiconductors, exhibiting a resistance decrease in the presence of ppm levels of the gases in air. Pellets were found to show some selectivity to propane over carbon monoxide which increased with temperature in the range 400–485 °C. The selectivity was shown to be dependent on the porosity of the pellets. There was no systematic variation of either sensitivity or selectivity with stoichiometry, x. Temperature-programmed mass spectrometric experiments showed that the onset of carbon monoxide oxidation occurred at 310 °C over these compounds, while propane combustion started at 420 °C. The propane–carbon monoxide selectivity was interpreted as being due to differences in the combustion kinetics of the two gases which resulted in different gas concentration gradients within the pellet. This was confirmed by using a novel electrode geometry, which enabled the resistance to be measured simultaneously at both the centre and the edge of a pellet.
Starting Page	1427
Ending Page	1431
Page Count	5
File Format	PDF
ISSN	09599428
Volume Number	4
Issue Number	9
Journal	Journal of Materials Chemistry
DOI	10.1039/JM9940401427
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Tetragonal crystal system Sodium tungsten bronze Powder diffraction Electron microprobe Electrical resistivity and conductivity Propane Carbon monoxide Extrinsic semiconductor Porosity Stoichiometry Electrode Molecular geometry
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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Selectivity and composition dependence of response of gas-sensitive resistors. Part 1.—Propane–carbon monoxide selectivity of Ba₆Fe_xNb_{10 –x}O₃₀(1 x 2)