Synthesis and electrical properties of stabilized manganese dioxide (α-MnO2) thin-film electrodes

Do Kyun Kwon, Teppei Akiyoshi, Hyeongjae Lee, Michael T. Lanagan

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Manganese dioxide (α-MnO2) thin films have been explored as a cathode material for reliable glass capacitors. Conducting α-MnO 2 thin films were deposited on a borosilicate glass substrate by a chemical solution deposition technique. High carbon activities originated from manganese acetate precursor, (Mn(C2H3O2) 2·4H2O) and acetic acid solvent (C 2H4O2), which substantially reduced MnO 2 phase stability, and resulted in Mn2O3 formation at pyrolysis temperature in air. The α-MnO2 structure was stabilized by Ba2+ insertion into a (2 × 2) oxygen tunnel frame to form a hollandite structure. With 15-20 mol% Ba addition, a conducting α-MnO2 thin film was obtained after annealing at 600-650°C, exhibiting low electrical resistivity (∼1 Ω·cm), which enables application as a cathode material for capacitors. The hollandite α-MnO2 phase was stable at 850°C, and thermally reduced to the insulating bixbyte (Mn2O3) phase after annealing at 900°C. The phase transition temperature of Ba containing α-MnO 2 was substantially higher than the reported transition temperature for pure MnO2 (∼500°C).

Original languageEnglish (US)
Pages (from-to)906-909
Number of pages4
JournalJournal of the American Ceramic Society
Volume91
Issue number3
DOIs
StatePublished - Mar 1 2008

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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