High resolution transmission electron microscopy of aluminophosphates

Conference · Sun Apr 01 00:00:00 EST 1990

OSTI ID:6949820

Ulan, J G; Gronsky, R ^[1]; Szostak, R ^[2]; Sorby, K ^[3]

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1. Lawrence Berkeley Lab., CA (USA)
2. Georgia Inst. of Tech., Atlanta, GA (USA)
3. Oslo Univ. (Norway). Dept. of Chemistry

VPI-5 transforms to AlPO{sub 4}-8 under mild thermal treatment (100{degree}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 AlPO{sub 4}-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 AlPO{sub 4}-8. Though the sheets containing the 18 member rings which define the pores in VPI-5 remain intact in AlPO{sub 4}-8, reduction in the porosity is attributed to blockages created by the movement of these sheets relative to each other. 8 refs., 7 figs.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6949820
• Report Number(s): LBL-29036; CONF-900466-75; ON: DE90015632
• Resource Relation: Conference: Spring meeting of the Materials Research Society, San Francisco, CA (USA), 16-21 Apr 1990
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM PHOSPHATES
MOLECULAR STRUCTURE
POROSITY
CRYSTAL STRUCTURE
THERMAL ANALYSIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ALUMINIUM COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
ELECTRON MICROSCOPY
MICROSCOPY
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
SCATTERING
360602* - Other Materials- Structure & Phase Studies
360603 - Materials- Properties