Flexibility of the Zeolite RHO Framework. Neutron Powder Structural Characterization of Ca-Exchanged Zeolite RHO

Abstract

Neutron powder diffraction structural characterizations of dehydrated samples of Ca-exchanged zeolite RHO showing the most pronounced distortions of this aluminosilicate framework from Im3m to 143m symmetry yet observed and corresponding to greater than a 7% decrease in the lattice parameter are reported. The framework of zeolite RHO is composed of a body centered cubic arrangement of truncated cubo-octahedra or alpha-cages linked via double 8- rings. Structural studies have shown that zeolite H-RHO undergoes an appreciable distortion and loss of symmetry from Im3m to 143m upon dehydration. This change in symmetry is directly related to an enormous 2.3% decrease in the lattice parameter which goes from 15.031(1) to 14.678(1). Deformation of the dehydrated form also shows a temperature dependence.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1988
Accession Number
ADA197195

Entities

People

  • D. R. Corbin
  • G. A. Jones
  • Galen D. Stucky
  • L. Abrams
  • M. M. Eddy

Organizations

  • University of California, Santa Barbara

Tags

DTIC Thesaurus Topics

  • Abstracts
  • California
  • Chemistry
  • Diffraction
  • Distortion
  • Ion Exchange
  • Military Research
  • Neutron Diffraction
  • Physics
  • Resilience
  • Security
  • Silicates
  • Symmetry
  • Universities

Fields of Study

  • Physics

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Materials Science and Engineering.
  • Materials Science.