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Evolution of crystallographic phases in the system (Pb1−xCax)TiO3: A Rietveld study

Published online by Cambridge University Press:  31 January 2011

Amreesh Chandra  and
Dhananjai Pandey
Amreesh Chandra
Affiliation:
School of Materials Science and Technology, Institute of Technology, Banaras Hindu University, Varanasi – 221005, India
Dhananjai Pandey
Affiliation:
School of Materials Science and Technology, Institute of Technology, Banaras Hindu University, Varanasi – 221005, India
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Abstract

X-ray powder diffraction studies on (Pb1−xCax)TiO3 ceramic powders revealed the presence of superlattice reflections due to antiphase and inphase tilts of oxygen octahedra for x ≥ 0.421. Rietveld analysis of the powder x-ray diffraction data confirmed that the structure of (Pb1-xCax)TiO3 is orthorhombic with Pbnm space group and a−a−c+ tilt system for x ≥ 0.421. For compositions with 0 < x ≤ 0.416, the structure was tetragonal, and the tetragonality decreased with increasing Ca2+ content.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 2 , February 2003 , pp. 407 - 414
Copyright
Copyright © Materials Research Society 2003

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