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X-ray powder diffraction refinement of PbTi(1−x)FexO(3−δ) solid solution series

Published online by Cambridge University Press:  28 June 2013

Hasitha Ganegoda ,
James A. Kaduk  and
Carlo U. Segre
Hasitha Ganegoda*
Affiliation:
Department of Physics and CSRRI, Illinois Institute of Technology, Chicago, Illinois
James A. Kaduk
Affiliation:
Department of Physics and CSRRI, Illinois Institute of Technology, Chicago, Illinois
Carlo U. Segre
Affiliation:
Department of Physics and CSRRI, Illinois Institute of Technology, Chicago, Illinois
*
a)Author to whom correspondence should be addressed. Electronic mail: [email protected]
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Abstract

A series of iron-doped lead titanate PbTi(1−x)FexO(3−δ) samples in the x = 0–1 composition range was prepared using sol–gel synthesis at a calcination temperature of 700 °C. The room temperature CuKα powder diffraction data collected from x = 0, 0.005, 0.01, 0.025, 0.05, 0.075, 0.1, 0.125, 0.15, 0.175, 0.2, and 0.3 samples were analyzed using the Rietveld method. Magnetoplumbite (PbFe12O19) secondary phase formation was observed at compositions x = 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1. Fe-composition dependent decrease of tetragonal distortion has been observed. According to Vegard's law, the B-site iron solubility limit in the lead titanate host was found to be approximately 10 mol% (x = 0.1). Homogeneous distribution of dopants below the solubility limit was evidenced by the linear behavior of unit-cell parameters. The absence of a cubic phase and the persistence of distorted oxygen octahedra indicated the existence of ferroelectric properties even at the x = 0.3 composition. Beyond x = 0.3, the P4mm tetragonal model was determined to be invalid possibly because of oxygen defect driven structural changes, mainly tilting Fe-polyhedra.

Keywords

powder structure refinementiron-doped lead titanateGSAS
Type
Technical Articles
Information
Powder Diffraction , Volume 28 , Issue 4 , December 2013 , pp. 254 - 261
Copyright
Copyright © International Centre for Diffraction Data 2013 

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