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PZT 분말제조시 수열조건별 특성 연구 : 반응온도, 광화제 및 반응시간의 영향
Studies on Characteristics of Hydrothermal Conditions in Preparing PZT Powders : Effects of Reaction Temperature, Mineralizer and Reaction Time
HWAHAK KONGHAK, August 1997, 35(4), 520-525(6), NONE
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Abstract
본 연구에서는 수열합성법을 이용한 PZT(Lead Zirconate Titanate) 분말제조시 반응온도의 변화, 반응시간의 증감 및 광화제 첨가 등이 입자의 결정성, 입도분포와 평균입경에 미치는 영향을 조사하였다. 수열용액의 용해도를 증가시키기 위하여 KOH를 광화제로 첨가함으로서 130-220℃의 반응온도범위와 100-200psi의 압력범위에서 입방체 모양을 갖는 1-5μm 크기의 PZT 결정분말을 제조할 수 있었다. 실험결과 온도가 증가함에 따라 핵생성 및 결정면의 발달이 빠르게 진행되었으며, 광화제 첨가량이 증가함에 따라 수열반응온도를 낮출 수 있었다. 또한 반응시간이 증가함에 따라 합성분말의 입도분포가 단분산 형태에서 이중형의 형태로 전이되고 입자들의 평균입경도 커짐을 알 수 있었다.
In this study PZT powders were prepared by hydrothermal synthesis. The effects of reaction temperature, reaction time and concentration of mineralizer on crystallinity and the size distribution of particles were investigated. The PZT powders in uniform size of 1-5μm with cubic shapes were obtained in the temperature range of 130-220℃ and the pressure range of 100-200psi using KOH as a mineralizer which increases the solubility of feedstock. It was found that nucleation and development of crystal phases progressed rapidly as the reaction temperature increased, but the reaction temperature decreased as the concentration of mineralizer increased. It was also found that the shape of the size distribution of particles was changed from a monodispersion to a bimodal dispersion, and that the mean particle size increased as the reaction time increased.
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