l llN AL- HAITHAM J.I'OH I'U RE & APPL. SCI.        V0L.I9(4) 2006

Studying the Connection Between Partical Size and Lattice Distortions Through X - Ray  Diffraction Line Profile Analysis for CaO Powder


K .H .Harbi
Department of Physics, College of Education  Ibn AI­
Hai t h am  University of Bagh dad .

Abstract
The integral  breadth  method  has been utilized to analyse line
proIiles broadening and lattice strain of CaO at different temperatures
The effect of tcmperattre on crystallite size and strain has also been investigated  . The crystall i tes are found to be highly anisotropic even at high temperatures .

Introduction
1\  detai led	knowledge  of crystallite size and strain in a finely
divided powder often helps to correlate many physical properties of a system under going transformation and solid - state reactions . X - Ray line broadening analysis provides a method of finding crystallite size and strain integral breadth methods ( I  -4 ) .
Calcium oxides have been imponant applications in manufacuturing (
5 - 8 ) . The present investigation aims were to  find the variation of
crystallite size and strain with temperat ure after correction li ne profile



Experimental
In this work, calcium carbonate was used to produce calcium oxide by treatment ofCaC0.1 at 1  100 •c , 1150 •c and 12000C . The
calcination time is chosen as 30 minutes for each run under static air , heating rate of  I o•c   /min  and   a·alumina  as reference material .
Diffraction pattren for the three samples were obtained using Philips automatic powder diffractometer (pwl820) with flat monochromator , step rate 0.02/l .Oec. Specimens were prepared by mounting


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