• Title/Summary/Keyword: Excess $91PbO-9WO_3$ addition

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Microstructure and Dielectric Properties in $40Pb(Mg_{1/3}Nb_{2/3})O_3-30PbTiO_3-30Pb(Mg_{1/2}W_{1/2})O}3$ Ceramics with Excess $91PbO-9WO_3$ Addition ($91PbO-9WO_3$가 과잉첨가된 $40Pb(Mg_{1/3}Nb_{2/3})O_3-30PbTiO_3-30Pb(Mg_{1/2}W_{1/2})O}3$계 세라믹스의 미세구조와 유전특성)

  • 길영배;이응상
    • Journal of the Korean Ceramic Society
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    • v.34 no.3
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    • pp.281-288
    • /
    • 1997

  • The effects of 0 to 6 mol% excess 91PbO-9WO3 addition on the microstructure and the dielectric pro-perties in 40Pb(Mg1/3Nb2/3)O3-30PbTiO3-30Pb(Mg1/2W1/2)O3 ternary system were investigated. Excess 91PbO-9WO3 addition enhanced densification at relatively lower temperature due to the formation of liquid phase. The dielectric constant of the specimen with standard composition was 16,400 and that of specimen with 1 mol% excess additive was the maximum of 18,500. And more than 2 mol% excess addition decreased dielec-tric constant. Specimens with 2~4 mol% 91PbO-9WO3 addition showed dual peak maxima in the tem-perature dependence of dielectric constant. In the specimens which have more than 5 mol% excess addition a new phase with W-rich composition was formed at grain boundary.

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