Incorporation of lanthanide ions in lead titanate |
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| Authors: | A Peláiz-Barranco Y Méndez-González D C Arnold P Saint-Grégoire D J Keeble |
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| Affiliation: | (1) Facultad de F?sica-Instituto de Ciencia y Tecnolog?a de Materiales, Universidad de La Habana, San L?zaro y L, Vedado, 10400 La Habana, Cuba;(2) School of Chemistry, University of St Andrews, St Andrews, Fife, KY16 9ST, UK;(3) Department of Sciences, University of N?mes, Rue du Dr Georges Salan, 30021 N?mes Cedex 01, France;(4) C2M, Institut C. Gerhardt, UMR-CNRS 5253, 34095 Montpellier Cedex 05, France;(5) School of Engineering, Physics, and Mathematics, University of Dundee, Dundee, DD1 4HN, UK |
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| Abstract: | Lanthanide ion doping of lead titanate was investigated using structural and differential scanning calorimetry measurements.
Dense ceramics samples were prepared with starting compositions, Pb1−3x/2Ln
x
TiO3, assuming A-site substitution of Ln = La, Nd, Sm, Eu, Gd and Dy, at 2 and 8 at.%. Doping with La3+ reduced the tetragonality and cell volume. A systematic recovery in these values was observed for the smaller Ln3+ ions, suggesting the onset of partial substitution of the Ln ions at the B-site. The ferroelectric–paraelectric transition
temperatures also recovered, consistent with an increased probability of B-site occupation with decreasing ion size. Evidence
for site occupancy obtained from the presence cation vacancies is also discussed. |
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