NdCl3･6H2O의 열적 분해 특성에 관한 연구
Thermal Decomposition Characteristics of NdCl3･6H2O
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초록
NdCl3는 NdCl3·6H2O로부터 제조되고, 이 때의 무수화 반응 메커니즘은 반응 온도, 반응 시간, 유입되는 가스와 같은 실험변수에 의해 해석되었다. NdCl3·6H2O의 열적 분해 반응은 differential thermal analysis (DTA)분석을 통해 130°C, 150°C, 190°C, 250°C, 400°C의 5단계로 연구가 수행되었다. 온도가 상승함에 따라 단계적으로 수화물이 제거 되는 결과를 확인하였고 400°C에서 무수화물을 제조하였다. HCl/Ar 분위기에서 2시간 반응시 완벽하게 무수화물이 제조되는 반면에 3시간 열처리 후,에는 Nd2O3와 Nd(OH)2Cl이 부산물로 생성되었다. 한편, HCl/Ar 분위기에서는 무수 염화물이 제조 되는 반면에 Ar분위기에서 산화물이 생성되었다. 최종적으로 NdCl3는 NdCl3·6H2O로부터 HCl/Ar 분위기하에서 400°C 온도에서 2시간의 열처리 과정을 거쳐 제조 되었다.
Abstract
Anhydride NdCl3 was prepared from NdCl3·6H2O and the anhydrous reaction mechanisms were identified by variables such as reaction temperature, reaction time and influent gas. Thermal decomposition reaction of NdCl3·6H2O was studied by 5 steps (130°C, 150°C, 190°C, 250°C, 400°C) using a differential thermal analysis (DTA). Results showed that stepwise dehydration proceeded with increasing temperature and completed at 400°C. Under HCl/Ar atmosphere, anhydride was completely prepared in 2 hour, whereas by-products were produced from Nd2O3 and Nd(OH)2Cl after a 3 hour heat treatment. Meanwhile, anhydrous chlorides were produced under HCl/Ar atmosphere, whereas oxides were produced under Ar atmosphere. Optimally, NdCl3 was prepared from NdCl3·6H2O by a 2 hour heat treatment at 400°C under HCl/Ar atmosphere.
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