Abstract
The possibilities of inductively coupled plasma-atomic emission spectrometry (ICP-AES) for the chemical characterization (dopants, impurities, and macroconstituents) of perovskite ceramic semiconductors (PTC thermistors, varistors, manganites, cobaltites) are shown. The dissolution of the samples is achieved by five methods: (a) decomposition with HCl in a Teflon-lined pressure vessel, (b) decomposition with HF + H 2SO 4 in a Teflon-lined pressure vessel, (c) decomposition with (NH 4) 2SO 4 + H 2SO 4 in a platinum dish, (d) fusion with Na 2CO 3 + Na 2B 4O 7 in a platinum crucible, (e) fusion with Li 2B 4O 7 in a graphite crucible. The spectral interferences and the inter-element effects are studied and corrected. The detection limits are comprised, approximately, between 0.00001% and 0.1%. High sensitivity and good precision are attained.
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