Record Display for the EPA National Library Catalog

RECORD NUMBER: 16 OF 66

OLS Field Name OLS Field Data
Main Title Effect of Satellite Lines from the X-ray Source on X-ray Diffraction Peaks.
Author Briden, F. E. ; Natschke, D. F. ;
CORP Author Acurex Corp., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Publisher c1991
Year Published 1991
Report Number EPA-68-02-4701; EPA/600/J-91/196;
Stock Number PB91-242552
Additional Subjects X ray diffraction ; Calcium hydroxides ; Sorbents ; Spectrum analysis ; Crystallites ; Chemical reactivity ; Combustion products ; Air pollution control ; Strains ; Corrosive gases ; Distribution functions ; Reprints ; Acid gases ; Satellite lines
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB91-242552 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 11/26/1991
Collation 8p
Abstract
The article discusses the development of a method for relating reactivity to crystallite size and strain parameters obtained by the Warren-Averbach technique. EPA has been using crystallite size and strain data obtained from x-ray diffraction (XRD) peak profile analysis to predict the reactivity of solid calcium hydroxide sorbent with acid gases in combustion streams. The software used for the calculations requires that the XRD peak profile be corrected with a distribution function before application in the Warren-Averbach analysis. The curve-fitting software, available on the system, includes the Gaussian, Lorentzian, pseudo-Voight, Pearson VII, and Split Pearson VII distribution functions. The function parameters are specified roughly at the start, and the computer algorithm then optimizes the fit parameters by the least squares method. Most of the work has been on calcium hydroxide sorbent materials with calcium fluoride as a standard to account for instrument effects on the peaks. It has been observed that none of the functions produce a satisfactory fit for the experimental XRD peaks.