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High Resolution Transmission Electron Microscopy of Aluminophosphates; Proposed Structure for AlPO4–8

Published online by Cambridge University Press:  21 February 2011

Judith G. Ulan ,
Rosemarie Szostak ,
Kristin Sørby  and
Ron Gronsky
Judith G. Ulan
Affiliation:
National Center for Electron Microscopy, Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
Rosemarie Szostak
Affiliation:
Zeolite Research Program, Georgia Tech Research Institute, Georgia Institute of Technology,Atlanta, Georgia 30332
Kristin Sørby
Affiliation:
Dept. of Chemistry, U. of Oslo, P.O Box 1033 Blindern, 0315 Oslo 3, Norway
Ron Gronsky
Affiliation:
National Center for Electron Microscopy, Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
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Abstract

VPI-5 transforms to AlPO4–8 under mild thermal treatment (100 °C, 18 hrs). HRTEM micrographs, oriented normal to the c axis, show extensive defect-free regions in VPI-5, while slip planes normal to the c axis are found in AlPO4–8. Analysis of the HRTEM data, in conjunction with infrared and thermal analysis, adsorption studies and x-ray powder diffraction, has lead to a proposed structure for AlPO4–8. Though the sheets containing the 18 member rings which define the pores in VPI-5 remain intact in AlPO4–8, reduction in the porosity is attributed to blockages created by the movement of these sheets relative to each other.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 183: Symposium E – High Resolution Electron Microscopy of Defects in Materials , 1990 , 317
Copyright
Copyright © Materials Research Society 1990

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