Structural changes during the transformation of birnessite to buserite and todorokite

Todorokite synthesized by autoclaving Mg-buserite was examined by infrared (IR) spectroscopy, X-ray diffraction (XRD), and high resolution transmission electron microscopy (hrtem). ir spectroscopy revealed that the structures of birnessite and buserite were very similar : the only difference may be in c-spacings, 7 À in one case and 10 À in the other, as shown by XRD analysis. Lattice fringes and structural images of todorokite correspond to 3 x n tunnels, where n ranges from 2 -15 octahedra ; these tunnels conform to those of the todorokite family. The repeat distance in the с direction remained almost constant near 10 À which may have been controlled by the hydrated Mg cation in the tunnel.Golden D.C., Sittertz-Bhatkar H., Dixon J.B. Structural changes during the transformation of birnessite to buserite and todorokite. In: Proceedings of the 9th international Clay Conference, Strasbourg, 1989. Vol V : Industrial applications of clays. Analytical techniques and teaching of clay mineralogy. Strasbourg : Institut de Géologie – Université Louis-Pasteur, 1990. pp. 177-183. (Sciences Géologiques. Mémoire, 89

Structural changes during the transformation of birnessite to buserite and todorokite

Todorokite synthesized by autoclaving Mg-buserite was examined by infrared (IR) spectroscopy, X-ray diffraction (XRD), and high resolution transmission electron microscopy (hrtem). ir spectroscopy revealed that the structures of birnessite and buserite were very similar : the only difference may be in c-spacings, 7 À in one case and 10 À in the other, as shown by XRD analysis. Lattice fringes and structural images of todorokite correspond to 3 x n tunnels, where n ranges from 2 -15 octahedra ; these tunnels conform to those of the todorokite family. The repeat distance in the с direction remained almost constant near 10 À which may have been controlled by the hydrated Mg cation in the tunnel.Golden D.C., Sittertz-Bhatkar H., Dixon J.B. Structural changes during the transformation of birnessite to buserite and todorokite. In: Proceedings of the 9th international Clay Conference, Strasbourg, 1989. Vol V : Industrial applications of clays. Analytical techniques and teaching of clay mineralogy. Strasbourg : Institut de Géologie – Université Louis-Pasteur, 1990. pp. 177-183. (Sciences Géologiques. Mémoire, 89

Erster Nachweis von Regurgitationsf\ufctterungen bei einer cribellaten Spinne (Stegodyphus lineatus Latreille. 1817, Eresidae)

Volume: 22Start Page: 175End Page: 18

Recto-tergal Fusion in the Braconinae (Hymenoptera: Braconidae): Structure and Distribution

Volume: 5Start Page: 73End Page: 7

Anterolateral abdominal scent glands of braconine wasps (Hymenoptera: Braconidae)

Volume: 6Start Page: 219End Page: 23