Structural and dielectric studies of three-phase composite containing multiwalled carbon nanotubes, nanodispersed silica and KDP

ABSTRACT

The study provides experimental results for clarifying the influence of a conductive filler of multiwalled carbon nanotubes (MWCNT) and a dielectric inclusion of nanodispersed silica (nSiO₂) on dielectric properties of a classical ferroelectric of KH₂PO₄ (KDP) in composites containing these substances. Wits increasing nSiO₂ content, the phase transition point of KDP was shifted toward higher temperatures along with a decrease in dielectric permittivity. Meanwhile, MWCNT composition did not affect phase transition, but enhanced dielectric permittivity that reached highest values at MWCNT:nSiO₂:KDP mass ratio of 0.096:1:1. The thrshod of MWCNT in the composite was also determined. The conductive nature of MWCNT and the interaction between nSiO₂ with KDP in the presence of residual water was figured out as the main reason for these anomalies.

KEYWORDS:

• Ferroelectric composites
• MWCNT
• KDP
• silica
• phase transition

Disclosure statement

No potential conflict of interest was reported by the author(s).