The Crystal Structure of Ramsdellite from Pirika Mine

スポンサーリンク

概要

• 論文の詳細を見る

• Chemical composition and crystal structure of ramsdellite from Pirika mine, Hokkaido, Japan were studied. Chemical composition, determined by EPMA, shows that ramsdellite is pure manganese oxide and does not contain any other element. The crystallographic data, obtained by Rietveld analysis, indicate that ramsdellite has orthorhombic symmetry. Space group is Pnma and unit cell parameters are: a=4.513(1)Å, b=9.264(1)Å and c=2.859(1)Å. The structure consists of MnO6 double chains (Byström, 1950). There are 4 symmetry-dependent MnO6 octahedral in an unit cell and 2 symmetry-independent oxygen atoms in an MnO6 octahedron. The difference of inter-atomic distances between Mn-O(1) and Mn-O(2) is larger than other manganese dioxide minerals. The distortion of MnO6 octahedron is quite similar to that of groutite (α-MnOOH). These data suggest that ramsdellite was formed by oxidation of groutite.

• 北海道大学 = Hokkaido Universityの論文

著者

• Miura H

  Hokkaido Univ.

関連論文

• The Crystal Structure of Ramsdellite from Pirika Mine
• CHARACTERISTICS OF SODIUM CHLORIDE-DOPED SILVER CATALYSTS FOR EPOXIDATION OF ETHYLENE

スポンサーリンク