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알칼리계 무연 압전 세라믹과 에폭시 복합소재의 유전 및 압전 특성
윤창호,러득탕,허대준,안경관,이재신,Yoon, Chang-Ho,Le, Duc Thang,Heo, Dae-Jun,Ahn, Kyoung-Kwan,Lee, Jae-Shin 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.6
Lead-free piezoelectric ceramic/epoxy composites with '0-3' connectivity were prepared by cold-pressing with a temperature controlled curing method. A ceramic powder with a composition of $(Na_{0.51}K_{0.47}Li_{0.02})(Nb_{0.8}Ta_{0.2})O_3$ was synthesized by a conventional solid state reaction route. The dielectric and piezoelectric properties of ceramic/epoxy composites were characterized as a function of the volume fraction (${\phi}$) of piezoelectric ceramics, which was varied from 70 to 95 vol%. The results indicated that the piezoelectric properties of composites were significantly affected by the volume fraction of ceramics. In terms of the piezoelectric properties, specimens showed the best performance at ${\phi}$= 85 vol%, resulting in the piezoelectric constant $d_{33}$ of 39 pC/N and the figure of merit as a piezoelectric energy harvester ($d_{33}{\cdot}g_{33}$) of 1.24 $pm^2/N$.