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The effect of B-doping on the electrical conductivity of polymer-derived Si(B)OC ceramics

  Articoli su Riviste JCR/ISI  (anno 2017)

Autori:  Sorar¨ G. D., Kacha G., Campostrini R., Ponzoni A., Donarelli M., Kumar A., Mariotto G

Affiliazione Autori:  Dipartimento di Ingegneria Industriale, UniversitÓ di Trento, Trento, Italy; SENSOR Lab, CNR, National Institute of Optics (INO), Brescia, Italy; SENSOR Lab, Department of Information Engineering, University of Brescia, Brescia, Italy; Graduate Course on Nanosciences and Advanced Technologies, UniversitÓ di Verona, Verona, Italy; Raman Micro Spectroscopy Laboratory (Lab-Ram), UniversitÓ di Verona, Verona, Italy; Dipartimento di Informatica, UniversitÓ di Verona, Verona, Italy

Riassunto:  In this work the room temperature electrical conductivity of Si(B)OC glasses made via polymer pyrolysis at 1200 degrees C and 1400 degrees C (maximum temperature) and having different amount of boron was measured. When B content is increased from zero (pure SiOC glass) up to B/Si=0.5 the electrical conductivity increases in 2 orders of magnitude from 4.09 +/- 0.64910(-5) up to 2.93 +/- 1.91910(-3) with a corresponding decrease in the activation energy from about 1.08 to 0.51 eV. This results shows for the first time that the electrical conductivity of Si-based polymer-derived ceramics can be controlled by the amount of the doping element. The structure of the Si(B) OC glasses has been studied with different techniques including FT-IR, XRD and Raman spectroscopy. The Raman study indicates that B partially substitutes C into the sp(2) C planes of the free carbon phase forming trigonal BC3 units. Accordingly, the evolution of the electrical properties with the B content has been correlated with the corresponding structural evolution and a hypothesis is presented to rationalize the role of boron on the electrical conductivity of SiOBC glasses.

Volume n.:  100 (10)      Pagine da: 4611  a: 4621
Ulteriori informazioni:  National Research Council, CNR, (Italy); Lombardia Region (Italy)
DOI: 10.1111/jace.14986

*Impact Factor della Rivista: (2017) 2.956   *Citazioni: 3
data tratti da "WEB OF SCIENCE" (marchio registrato di Thomson Reuters) ed aggiornati a:  19/05/2019

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