딕카이트로부터 스멕타이트를 수열법으로 합성하고 XRD, IR, TG, DTA, EDS 및 XRF를 사용하여 물리${cdot}$화학적 특성을 분석하였다. 합성 스멕타이트에 대해 Greene-Kelly 시험을 한 결과, 베이델라이트임을 확인하였다. IR 분석결과, 합성 베이델라이트의 Al-OH 진동에 의한 특징적인 흡수띠인 818, $770;cm^{-1}$ 피크가 관찰되었으므로 순수한 베이델라이트임을 확인되었다. DTA-7G 실험결과 합성된 베이델라이트는 약 $16\%$의 수분을 함유하고 있었으며, $117^{circ}C$에서 탈수 작용이 발생하고, $482^{circ}C$와 $685^{circ}C$ 두 곳에서 탈수산화 작용에 의한 흡열 반응이 나타났다. 또한, $1028^{circ}C$에서 합성 반응물은 뮬라이트와 크리스토발라이트로 재결정되었다. CEC, M.B. 시험 및 팽윤도를 분석한 결과, 각각 $l16~l18$ cmol/kg, $84~91\%,;29~32$ mL/2 g으로 양호한 결과를 나타내었다. EDS 및 XRF 분석 결과, 구조식은 $Na_{0.5}Al_{2.5}Si_{3.5}O_{10}(OH)_2$이었다.
Beidellite, a member of the smectite group, was synthesized hydrothermally from dickite. Physical and chemical properties of the synthetic Na-beidellite were characterized by the analytical methods of XRD, IR, TG, DTA, EDS, XRF and ICP. The result of Greene-Kelly test indicates that the synthesized smectite is Na-beidellite. IR spectrum of synthesized beidellite exhibited Al-O-H bending vibration at $818;cm^{-1};and;770;cm^{-1}$ which was observed particularly in pure beidellite. TGA analysis revealed that the synthesized Na-beidellite comprises $16;wt\%$ of water. DTA curve showed an endothermic peak at $117^{circ}C$ due to dehydration reaction and peaks at $482^{circ}C$ and $685^{circ}C$ due to dehydroxylation reaction. The clay mineral was transformed to mullite and cristobalite at the temperature of $1028^{circ}C$. The CEC value, Methylene Blue test and swelling capacity was determined to be $116~118;cmol/kg,;84~91\%,;29~32;mL/2g$, respectively. The chemical composition of the synthesized phase was identified as $Na_{0.5}Al_{2.5}Si_{3.5}O_{10}(OH)_2$ from EDS and XRF analyses.
