Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-28T06:34:33.924Z Has data issue: false hasContentIssue false
  • English
  • Français

Texture Measurement of Sintered Alumina Using the Marchdollase Function

Published online by Cambridge University Press:  06 March 2019

James P. Cline ,
Mark D. Vaudin ,
John E. Blended ,
Carol A. Handwerker ,
Rodney Jiggetts ,
Keith J. Bowman  and
Nicholas Medendorp
James P. Cline
Affiliation:
National Institute of Standards and Technology Gaithersburg, Md 20899
Mark D. Vaudin
Affiliation:
National Institute of Standards and Technology Gaithersburg, Md 20899
John E. Blended
Affiliation:
National Institute of Standards and Technology Gaithersburg, Md 20899
Carol A. Handwerker
Affiliation:
National Institute of Standards and Technology Gaithersburg, Md 20899
Rodney Jiggetts
Affiliation:
National Institute of Standards and Technology Gaithersburg, Md 20899
Keith J. Bowman
Affiliation:
National Institute of Standards and Technology Gaithersburg, Md 20899
Nicholas Medendorp
Affiliation:
Purdue University West Lafayette, In 47907
Get access

Extract

The Rietveld method entails the calculation of a powder diffraction pattern from crystallographic, microstructural and equipment characteristics. These characteristics are related to the form of the pattern through a series of model functions. The difference between an observed and calculated pattern is then minimized by sequentially refining the physical parameters contained within the mode) functions to obtain an accurate and precise description of the specimen. A powder diffraction pattern from a specimen exhibiting cry stallo graphic texture, or preferred orientation, will display intensity values which differ systematically from those calculated for a specimen of random orientation. This systematic discrepancy can be addressed by incorporating into the Rietveld refinement a model function for sample texture. A successful model for texture will accurately assess the phase abundance and degree of texture from both oriented and randomized specimens. In this study we use the March-Dollase model function to characterize texture development in sintered alumina with respect to processing variables and sintering time.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 37: Forty-Second Annual Conference on Applications of X-ray Analysis, August 2-6, 1993 , 1993 , pp. 473 - 478
Copyright
Copyright © International Centre for Diffraction Data 1993

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Dollase, W.A., 1986, Correction of Intensities for preferred orientation in powder diffractometry: application of the March model, J. Appl. Crst. 19:267 Google Scholar
2. A., March, 1932, Mathematische theorie der regelung nach der korngestalt bei affiner deformation, Z. Kristailogr. 81:285 Google Scholar
3. Larsen, A.C., General, Von Dreele R. B. Structure Analysis System, Rietveld Analysis Software, LANSCE, MS-H805, Los Alamos Nat, Lab., Los Alamos, NM 87545Google Scholar
4. Handwerker, C.A. et al., to be submitted to the.J.Amer.Cer.Soc. Google Scholar
5. Jensen, D.J., 1992, “Kinetic Texture Measurements,” Neutron News, 3[1]:21 Google Scholar
6. Vaudin, M.D., Carter, W.C., 1991, Studies of ceramics by use of backscatter diffraction patterns in the scanning electron microscope, Microbeam Analysis 152Google Scholar