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Critical oxygen content in porous anodes of solid tantalum capacitors

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Abstract

X-ray diffraction analysis of sintered porous anodes of solid tantalum capacitors and the current-voltage (I–V) characteristics of Ta2O5 amorphous layers formed on the anode surface have been performed. A strong correlation between a sharp increase of direct current in the I–V characteristics at some critical oxygen content and the creation of a saturated solid-phase solution of oxygen in tantalum was found. The appearance of a crystalline oxide Ta2O5 phase was detected in porous anodes at oxygen contents above the critical oxygen level. The decrease of effective radius below 1 μm of Ta powder particles used in sintering leads to the size effect: the oxygen content in the porous anode after sintering exceeds the solubility limit. © 1998 Kluwer Academic Publishers

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Authors and Affiliations

  1. Vishay Israel Electronics Company, Industrial Park, Dimona, 86000, Israel

    Yu. Pozdeev-Freeman, Yu. Rozenberg, A. Gladkikh, M. Karpovski & A. Palevski

Authors
  1. Yu. Pozdeev-Freeman
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  2. Yu. Rozenberg
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  3. A. Gladkikh
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  4. M. Karpovski
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  5. A. Palevski
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Pozdeev-Freeman, Y., Rozenberg, Y., Gladkikh, A. et al. Critical oxygen content in porous anodes of solid tantalum capacitors. Journal of Materials Science: Materials in Electronics 9, 309–311 (1998). https://doi.org/10.1023/A:1008884924762

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  • DOI: https://doi.org/10.1023/A:1008884924762

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