$Pb(Mg_{1/3}Nb_{2/3})O_3-PbTiO_3$ 계 완화형 강유전체의 특성에 미치는 $PbTiO_3$ 첨가량의 변화 -I.유전특성 및 초전특성-

Effect of $PbTiO_3$ Concentration on the Properties of $Pb(Mg_{1/3}Nb_{2/3})O_3-PbTiO_3$ Relaxor Ferroelectrics

  • 박재환 (서울대학교 무기재료공학과) ;
  • 흥국선 (서울대학교 무기재료공학과) ;
  • 박순자 (서울대학교 무기재료공학과)
  • 발행 : 1996.04.01

초록

PMN계에서 유전적 성질에 관한 연구들은 광범위하게 이루어져 왔으나 전계인가 변위특성에 관한 폭넓은 연구는 매우 드물다. 본 연구에서는 완화형 강유전체의 가장 대표적인 PMN계에서 PT의 함량 및 측정 온도의 변화에 따른 유전적 성질 및 전계인가 변위특성을 광범위하게 조사하는 것을 목표로 하고 있다. 전형적인 columbite precur-sor법에 의해 분말을 준비하고 고상소결방법에 의하여 모든 시편을 제조하였다. PT의 함량이 증가하면서 직선적으로 (T$\varepsilon$max)가 증가하였으며 유전율은 13000~22000 사이의 값을 보였다. 유전율의 온도 의존성은 PMN의 경우 전형적인 완화형 강유전체의 유전 특성을 보이지만 PT의 함량이 증가될수록 보통 강유전체의 sharp한 거동을 보였다. 전계인가 변위특성에서는 단순히 유전율이 최대가 되는 온도에서 발생 strain이 최대가 되는 것은 아니며 tetragonal-cubic의 phase transition에서는 strain의 증가가 없고 rhombohedral에서 tetragonal 혹은 rhombohed-ral에서 cubic으로의 상전이에서만 strain이 크게 나타남을 알 수 있었다.

In order to understand the electrostrictive behavior of Pb(Mg1/3Nb2/3)O3-PbTiO3(PMN-PT) solid solutions the dielectric constants and the electric-field-induced strains in (1-x)PMN-xPT (x=0.0-0.4) were investigated in the temperature range -5$0^{\circ}C$-20$0^{\circ}C$. Powder of (1-x)Pb(Mg2/3Nb2/3)O3-xPbTiO3 (x=0.0, 0.1, 0.2, 0.3, 0.35, and 0.4) were prepared from the oxide forms of Pb, Mg, Nb and Ti via a columbite precursor method As the amount of PbTiO3 increases the temperature of maximum dielectric constant(T$\varepsilon$max) increases and the phase transition become less diffusive. The strain maximum occurs only when the diffuse phase transition occurs from rhombohedral to cubic or rhombohedral to tetragonal as in x=0.1-0.35 The strains monotonically decrease with temperature in the materials in which phase transition occurs from tetragonal to cubic as in x=0.4.

키워드

참고문헌

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