Abstract
The preparation, characterization and gas-sensing properties of the Sb 2O 3Fe 2O 3 complex oxide system have been investigated. Raw powders (with Sb/Fe = 0.2–1.0) of this system have been obtained by chemical coprecipitation. Effects of the Sb/Fe ratio and calcining temperature on the phase constituents and microstructure are characterized by thermal gravimetric-differential thermal analysis, X-ray diffraction and transmission electron microscopy. In the Sb 2O 3Fe 2O 3 system, Fe 2Sb 2O 7 can be used as a new type of gas-sensing material, which has a fair sensitivity to reducing gases. However, of all the samples the powder with Sb/Fe = 0.5 calcined below 800°C, composed of 50% α-Fe 2O 3 and 50% Fe 2Sb 2O 7, exhibits the highest sensitivity to some hydrocarbon gases such as C 2H 2, petrol and liquid petroleum gas (LPG). This is attributed to both very fine crystallites and the amorphous phase of α-Fe 2O 3 existing in the sample.
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