압전 세라믹 조성물

Piezoelectric Ceramic Compositions

Abstract

PURPOSE: Provided is a piezoelectric ceramic composition which has a large signal piezoelectric constant, a large electromechanical coupling factor and a small mechanical quality coefficient. CONSTITUTION: The piezoelectric ceramic composition has a composition represented by xPb(Mg1/2W1/2)O3-yPb(Ni1/3Nb2/3)O3-zPbTiO3-wPbZrO3, wherein x, y, z and w are a molar ratio; 0<=x<=0.05; 0.30<=y<=0.55; 0.35<=z<=0.45; 0.10<=w<=0.25; and x+y+z+w = 1. Preferably the piezoelectric ceramic composition has a composition represented by xPb(Mg1/2W1/2)O3-yPb(Ni1/3Nb2/3)O3-zPbTiO3-wPbZrO3 + uY2O3, wherein x, y, z and w are a molar ratio; 0<=x<=0.05; 0.30<=y<=0.55; 0.35<=z<=0.45; 0.10<=w<=0.25; x+y+z+w = 1; and u satisfies the relation represented by 0<=u (wt%)<=0.5 based on the total weight of the composition.
본 발명은 압전상수와 전기기계 결합계수가 크고 기계적 품질계수가 작은 하기 화학식 1로 나타내어지는 압전 세라믹 조성물에 관한 것이다. <화학식 1> xPb(Mg 1/2 W 1/2 )O 3 -yPb(Ni 1/3 Nb 2/3 )O 3 -zPbTiO 3 -wPbZrO 3 상기 식 중, x, y, z 및 w는 몰비로서 각각 0 ≤x ≤0.05, 0.30 ≤y ≤0.55, 0.35 ≤z ≤0.45 및 0.10 ≤w ≤0.25이되 x + y + z + w = 1이다. 또한, 본 발명은 상기 압전 세라믹 조성물에 Y 2 O 3 가 더 첨가되어 하기 화학식 2로 나타내어지는 압전 세라믹 조성물에 관한 것이다. <화학식 2> xPb(Mg 1/2 W 1/2 )O 3 -yPb(Ni 1/3 Nb 2/3 )O 3 -zPbTiO 3 -wPbZrO 3 + uY 2 O 3 상기 식 중, x, y, z 및 w는 몰비로서 각각 0 ≤x ≤0.05, 0.30 ≤y ≤0.55, 0.35 ≤z ≤0.45 및 0.10 ≤w ≤0.25이되 x + y + z + w = 1이고, u는 조성물의 전체 중량을 기준으로 0 wt% ≤u(wt%) ≤0.5 wt%이다.

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