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Pb2+-stabilized Ruddlesden–Popper (Sr1−xPbx)3Ti2O7 ceramics

Published online by Cambridge University Press:  10 May 2016

Feng Gao ,
Yunfei Chang ,
Stephen F. Poterala ,
Elizabeth Kupp  and
Gary L. Messing
Feng Gao
Affiliation:
Department of Materials Science and Engineering, Pennsylvania State University, PA16802, USA; and State Key Laboratory of Solidification Processing, School of Material Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
Yunfei Chang
Affiliation:
Department of Materials Science and Engineering, Pennsylvania State University, PA16802, USA; and Condensed Matter Science and Technology Institute & School of Science, Harbin Institute of Technology, Harbin 150080, Heilongjiang, China
Stephen F. Poterala
Affiliation:
Department of Materials Science and Engineering, Pennsylvania State University, PA16802, USA
Elizabeth Kupp
Affiliation:
Department of Materials Science and Engineering, Pennsylvania State University, PA16802, USA
Gary L. Messing*
Affiliation:
Department of Materials Science and Engineering, Pennsylvania State University, PA16802, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Pb2+-doped (Sr1−xPbx)3Ti2O7 (SPT) ceramics were fabricated by a solid state reaction. The stability and lattice structure of Sr3Ti2O7 and Sr4Ti3O10 Ruddlesden–Popper (RP) phases were studied as a function of Pb2+ content and sintering atmosphere. X-ray diffraction indicates that SrO(SrTiO3)n RP phase formation is sensitive to the Sr:Ti ratio of the raw materials and is a complex circularly iterative process. When the PbO concentration is less than x = 0.03, pure Sr3Ti2O7 can be obtained. Sr4Ti3O10 was found to be the main phase in the SPT samples for x ≥ 0.075. Pb2+ stabilizes SrO(SrTiO3)n RP phases by substitution for Sr2+ which reduces the lattice stress of the RP phase. It was observed that SrO vaporization losses at high temperature can be compensated by the decomposition of the intermediate SrPbO3 phase at lower temperature.

Keywords

dopingRuddlesden–Popper phasephase transformationlattice structurestability
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 10 , 28 May 2016 , pp. 1456 - 1465
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Copyright
Copyright © Materials Research Society 2016 

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