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- W2188706794 abstract "Crystal structures offour natural Na-rich cordierites (space group Cccm) refined at room temperature are described. Electron-microprobe, Li and Be analyses, and structure refinements indicate the substitutions Na+ + Be2+ -> AP+ and Na+ + Li+ -> MgH or FeH. All crystals exhibit a high degree of (Si,Al) ordering typical oflow-cordierites. The effect ofNa on the structure is determined by comparison with previously reported structures of Napoor crystals. Partial incorporation ofNa in the center of the six-membered ring of oxygen atoms (023-026-0J-023-026-021) causes the rings to predominantly compress along the b-axis, whereas the larger six-membered rings of cations (T23-T 26-T 21-T23-T26-T21) slightly expand along the same direction. These opposing motions lead to an increase in the b-axis and are responsible for a nearly hexagonal lattice geometry in Na-rich cordierites. Linear regression analyses reveal that tetrahedral angles (O-T-O) and individual T-O bonds are affected by Na content. The Al tetrahedron Tl1, interconnecting six-membered rings of tetrahedra, is the preferred site for Be substitution in cordierite. The smaller ionic radius of Be significantly decreases the mean T 11-0 bond length. Li partially occupies octahedral positions and substitutes for Mg or Fe. All Na-rich cordierites studied are also H20 rich because each Na attracts two water molecules into the adjacent structural cavities to complete its coordination polyhedron of eight oxygen atoms." @default.
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- W2188706794 date "1986-06-01" @default.
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- W2188706794 title "Role of Na in the structure of low-cordierite: A single-crystal X-ray study" @default.
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