Accession Number : ADA264632


Title :   Two New Titanium Pyroarsenates: Alpha-TiAs2O7 and Beta-TiAs2O7


Descriptive Note : Technical rept. 1 Jun 92-31 May 93,


Corporate Author : CALIFORNIA UNIV SANTA BARBARA DEPT OF CHEMISTRY


Personal Author(s) : Harrison, William T ; Gier, Thurman E ; Stucky, Galen D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a264632.pdf


Report Date : 20 Apr 1993


Pagination or Media Count : 14


Abstract : Two new titanium pyroarsenate phases, alpha-TiAS2O7 and beta-TiAS2O7, have been prepared by high temperature hydrothermal methods and characterized by single crystal x-ray diffraction techniques. Both structures are based on different three-dimensional networks of vertex-sharing TiO6 octahedra and AsO4 tetrahedra. The TiO6 groups show little distortion from regular octahedral geometry, and the arsenate anions are linked in pairs via As-0-As bonds to form pyroarsenate (AS207) groups. Alpha-TiAS2O7 is isostructural with a polymorph Of SiP2O7; beta-TiAS207 is a new structure.


Descriptors :   *CRYSTAL STRUCTURE , *SYNTHESIS(CHEMISTRY) , *ARSENATES , OPTICAL PROPERTIES , PHYSICAL PROPERTIES , X RAY DIFFRACTION , CRYSTALS , SHARING , GEOMETRY , TITANIUM , ANIONS , DISTORTION , MOLECULAR STRUCTURE , CHEMICAL REACTIONS , THREE DIMENSIONAL , SINGLE CRYSTALS , STRUCTURES , HIGH TEMPERATURE , TEMPERATURE


Subject Categories : Inorganic Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE