마그네사이트 (MgCO$_3$)의 결정구조에 관한 연구

Studies on the Crystal Structure of Magnesite

  • 발행 : 1975.09.01

초록

The crystal structure of synthetic magnesite has been studied by X-ray method. Magnesite is trigonal R3c, with a=4.637$\AA$, c=15.023$\AA$ and Z=6. Intensity data were collected with a Rigaku automated four-circle diffractometer and Mo-K$\alpha$ radiation. The structure was refined by the full-matrix least squares method using anisotropic thermal parameters. The final R index for 234 reflections is 0.037. The C-O and Mg-O bond lengths were 1.283 and 2.105$\AA$, respectively. The interatomic angles of three kinds of O-Mg-O were 88.25, 91.75 and 180.00$^{\circ}$, respectively. It is clarified that the distortion of the Mg-O6 octahedron in magnesite is smaller than that of Ca-O6 in calcite.

키워드

참고문헌

  1. 釜山大, 生技硏, 硏報 v.14 마그네사이트(MgCO₃)의 構造解析 吳基東
  2. Amer. Mineral. v.58 Hydrothermal growth of magnesite single crystals Oh, K.D;H. Morikawa;S. Iwai;H. Aoki
  3. International Tables for X-ray Crysyallography v.1 Norman, F.M.H;K. Lonsdale
  4. Acta Crystallogr. v.18 Position and thermal parameters of oxygen atoms in calcite Chessin, H.;W.C. Hamilton;B. Post
  5. Crystallographic Society Universal Crystallographic Computation Program System Sakurai, T.
  6. Amer. Mineral. v.56 Crystal structures of aragonite, strontianite, and witherite De Villiers, J.P.R.
  7. Amer. Mineral. v.56 Refinement of the crystal structure of aragonite Dal Negro, A.;L. Ungaretti