Abstract
For calcium lanthanum sulphide (CLS) formation, the effect of the sulphurizing agent is studied. CS 2 and sulphur are used as sulphurizing agents to sulphurize the lanthanum and calcium carbonate precursors which are formed by a coprecipitated method. With CS 2 as a sulphurizing agent, the intermediate product formed is LaS 2 whereas when sulphur is employed, the La 2O 2S was the intermediate product. If LaS 2 is formed first, it is not difficult to complete the sulphurizing reaction for CLS at a low temperature (700°C) for a short soaking time (3 h). However, if the La 2O 2S is formed first, the phase formation reaction of CLS should be completed at a high temperature (800–1050°C) for a long soaking time in order to dissociate the LaO bond.
Published Version
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