Effect of decomposition temperature on crystallite size and strain of CaO

Sattar A. Abass, Abass F. Almamori and Amel D. Hussain

Physical Sciences Research International
Published: December 11 2014
Volume 2, Issue 4
Pages 68-76

Abstract

The crystallite size and strain of CaO ceramic powder have been determined from X-ray line-broadening analysis at different decomposition temperatures. The CaO powder has been prepared from decomposition of calcium carbonate CaCO3 at different temperature which have been characterized by X-ray diffraction (XRD) and Differential, Thermal Analysis (TG, DTA) methods. Correction of the FWHM by Warren – method has resulted in corrected values of crystallite size. The crystallite size has been found to increase with increasing decomposition temperature from 30.2 nm at 800°C to 58.7 nm at 1200°C. Strain on the other hand decreases from 2.89 × 10^-3 at 800°C to 1.53 × 10^-3 at 1200°C. Estimation of micro hardness on compacts of different crystallite sizes has showed that crystallite size may influence the bearing load that compact can endure.

Keywords: X-ray diffraction, crystallite size, materials, heat treatment.

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