The analysis of x-ray diffraction (XRD) patterns by the Rietveld technique was tested to the quantitativelyphase compositions of self reinforcement AlzOiCaAl12019composite. Room-temperature XRD patterns revealed that a-Al203wasthe only phase presence in the CAOsample, whereas the a-A1203and CaAI12019phases were found for CA5,CA15, CA30, and CA50 samples. The peak intensity of CA6 in the self reinforcement Alz03/CaA112019compositesincreased in proportion with increase in CaAI12019content in contrast to a-AI203. The diffraction patterns for CA100sample shows minor traces of a-Ah03 even in relatively low peak intensity. It is suggesting that the in-situ reactionsintering of raw materials were not react completely to form 100 wt % CaAl12019at temperature 1650 DC.Quantitativephase compositions of self reinforcement AlzOiCaAl12019composites by Rietveld analysis with XRD data has beenwell demonstrated. The results showed that the OOF values are relatively low and the fluctuation in the difference plotsshows a reasonable fit between the observed and the calculated plot.Keywords: X-ray diffraction, Rietveld technique, Al20iCaAl12019PACS: 61.l0.Nz. D. Asmi, I.M. Low2, and B.O'Connor21Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung,ll.Sumantri Brojonegoro No.1, Bandar Lampung 35145, Indonesia2Materials Research Group, Department of Applied Physics, Curtin University of Technology,GPO Box U 1987, Perth, Western Australia
