Using multi-walled carbon nanotubes in spark plasma sintered Pb(Zr0.47Ti0.53)O3 ceramics for tailoring dielectric and tunability properties

• DOI: 10.1063/1.4900527
• Publication Date: 2014-10-30T00:30:39Z
• Authors: Cristina E. Ciomaga; Leontin Padurariu; Lavinia P. Curech...; Nicoleta Lupu; Isabelle Lisiecki; Marco Deluca; Sorin Tascu; Carmen Galassi; Liliana Mitoseriu
• Keywords: Spark Plasma Sintering; Relative density

The addition of small amounts (below 0.1 wt. %) multi-walled carbon nanotubes (MWCNTs) to Pb(Zr0.47Ti0.53)O3 (PZT) ceramics prepared by spark plasma sintering is proposed as a method tailoring the electrical properties, which are expected be modified with respect pure PZT, both result presence 1-D conductive fillers in ceramic product and via microstructural modifications induced during sintering. even strongly reduced sinterability PZT resulted porous fine-grained microstructures (relative density 73% for MWCNT 0.5 vol. % comparison 91% produced same conditions). A monotonous decrease permittivity increasing level from ∼830 ∼627 x = %, at fixed frequency f 1kHz, low dielectric losses below 2% have been observed. Tunability increases values dense concentration high 0.0625 then monotonically decreases higher additions. Calculations finite element modeling demonstrated that compositions percolation limits microstructures, major role changing properties local field modification related porosity rather than influence MWCNTs survived after post-annealing treatment. about 14% combined tunability obtained reasonable fields, makes idea using ferroelectric an interesting approach searching new structures properties.