J. Korean Ceram. Soc. > Volume 44(3); 2007 > Article
 Journal of the Korean Ceramic Society 2007;44(3): 175. doi: https://doi.org/10.4191/kcers.2007.44.3.175
 분자동력학법에 의한(62-x)CaO·38Al2O3 ·xBaO 유리의 구조 분석 이성주, 강은태1 한국베랄(주)1경상대학교 나노.신소재공학부, 경상대학교 공학원 A study on the Structure of (62-x)CaO Seong-Joo Lee, Eun-Tne Kang1 R&D Center, Koreaberal Co. Ltd.1Division of Nano & Advanced Materials Science and Engineering, Gyeongsang National University, Engineering Research Institute, Gyeongsang National University ABSTRACT Molecular dynamics simulation (MD) of $(62-x)CaO{cdot}38Al_{2}O_{3}{cdot}xBaO$ glasses has been carried out using empirical potentials with the covalent term. The simulations closely reproduce the total neutron correlation functions of glass with 5 mol% BaO and physical properties of these glasses such as elastic constants. For these glasses, aluminum is tetrahedrally coordinated by oxygen, but there is a part of five-fold and six-fold coordination of aluminum. There are no major changes to the mid-range structure of glass, as barium is substituted for calcium. To predict the barium coordination number, we have used the bond valence (BV) theory and also compared the results of simulation with Bond valence. The coordination number for oxygen around barium atoms is close to 8 and the average distance of barium and oxygen is nearly 2.80 A. The viscosity of these glasses increases with the content of barium oxide substituted for calcium oxide. Key words: Calcium aluminate glass, Molecular dynamics simulation, Neutron diffraction, Bond valence, Glass structure
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