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X-ray diffraction analysis of lanthanum and titanium substituted lead zirconate

Published online by Cambridge University Press:  06 March 2012

Nichole Wonderling,
Else Breval and
Joseph P. Dougherty
Nichole Wonderling
Affiliation:
Materials Research Institute, Penn State University, University Park, Pennsylvania 16802
Else Breval
Affiliation:
Materials Research Institute, Penn State University, University Park, Pennsylvania 16802
Joseph P. Dougherty
Affiliation:
Materials Research Institute, Penn State University, University Park, Pennsylvania 16802
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Abstract

The change in the orthorhombic structure of PbZrO3 was studied as a function of the La substitution for Pb and Ti substitution for Zr. Two types of changes can occur: (1) a change in the atom coordinates toward the positions for a perfect cubic perovskite lattice; and (2) a change of orthorhombic unit cell parameters so that ao, bo, and co exactly fit with the cubic cell parameter ac. Therefore, ao=ac√2, bo=ac.2√2, and co=ac.2, where ao, bo, and co are the orthorhombic cell parameters, and ac is the cubic cell parameter. Substitution of Pb by La in the orthorhombic PLZT leads to both a change in atom coordinates and a change in unit cell parameters toward the perfect cubic structure, especially for La≥4. Substitution of Zr by Ti in the orthorhombic PLZT leads to similar atom coordinate changes, but the unit cell parameters do not change. The composition 0/92.5/7.5 contains a major tetragonal phase and a minor orthorhombic phase. There are only small differences in the orthorhombic structure between the A and the B composition of PLZT. The A composition has a structure closer to the cubic structure than the B composition.

Keywords

powder diffractionperovskite structure

Information

Type
New Diffraction Data
Information
Powder Diffraction , Volume 17 , Issue 4 , December 2002, pp. 295 - 300
Copyright
Copyright © Cambridge University Press 2002

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