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고온 수용액으로부터의 고품질 α-Quartz 분말 제조
Preparation of High Quality Crystalline α-Quartz Powder from High Temperature Solution
HWAHAK KONGHAK, April 1997, 35(2), 147-153(7), NONE
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Abstract
입자의 크기가 균일하고 양질의 결정성을 갖는 고품질 α-SiO2 단결정 분말을 수열 조건에서 제조하였다. α-SiO2 단결정 분말은 300-450℃의 온도 범위와 100-300atm의 압력 범위내에서 3시간 동안의 수열반응을 통해 제조되었다. 반응은 무정형 실리카를 영양제로 사용한 성장용액의 용해도를 증가시키기 위해 KOH, NaOH, Na2CO3, KF, NaF와 같은 알칼리와 할로겐 화합물을 광화제로 첨가해서 수열합성시켰으며, 비교적 소량의 첨가에도 우수한 효과를 나타냈다. 수열합성법을 통해 입도가 1-10㎛ 범위내에 해당하고, 육방정의 안정된 결정형을 갖는 α-SiO2 단결정 분말을 얻을 수 있었다. XRD, SEM, PSA, FT-IR과 Raman spectrometer를 이용해서 수열합성물의 물성 특성을 비교·분석하였다.
In this study powders of high quality α-quartz(α-SiO2) crystal having uniform particle sizes and high crystallinity were prepared under hydrothermal conditions. The α-quartz powders were prepared after a 3 hours’ operation in the temperature range of 300-450℃ and in the pressure range of 100-300 atm. Alkali hydroxides and alkali halides such as KOH, NaOH, Na2CO3, KF, and NaF were found to be effective in this reactions, which added in order to increase the solubility of amorphous silica feedstock. The α-quartz crystal powders were obtained in uniform size of 1-10μm with hexagonal structure. The characterization of the synthetic products were carried out using XRD, SEM, PSA, FTIR and Raman spectrometer.
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