Effective size of vacancies in the Sr1-3x/2Ce xTiO3 superstructure

Rick Ubic; Ganesanpotti Subodh; Mailadil T. Sebastian; Dclphine Gout; Thomas Proffen

doi:10.1002/9780470528990.ch20

Effective size of vacancies in the Sr_1-3x/2Ce _xTiO₃ superstructure

Rick Ubic, Ganesanpotti Subodh, Mailadil T. Sebastian, Dclphine Gout, Thomas Proffen

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

22 Scopus citations

Abstract

Four compositions in the Sr_2-3x/2Ce_xTiO₃ homologous series corresponding to x = 0.1333, 0.1667, 0.1818, 0.25, and 0.4 have been synthesized by mixed-oxide processing and crystallographically characterized by electron diffraction. A non-cubic perovskite superlattice is observed for each composition caused by antiphase octahedral tilting. The degree of tilt increases with increasing x. Structural refinements of neutron diffraction data previously published indicate that the A-site size decreases with increasing x, but not as much as would be expected if vacancies were truly zero-dimensional defects; instead, A-site vacancies posses an effective finite size, presumably due to mutual repulsion of the coordinating oxygen ions. Based on these results, modifications to the predictive formula for pseudocubic lattice constant are proposed and seem successful for several systems with disordered A-site vacancies.

Original language	English
Title of host publication	Advances in Electroceramic Materials - A Collection of Papers Presented at the 2008 Materials Science and Technology Conference (MS and T08)
Publisher	American Ceramic Society
Pages	177-185
Number of pages	9
ISBN (Print)	9780470408445
DOIs	https://doi.org/10.1002/9780470528990.ch20
State	Published - 2009
Externally published	Yes
Event	Advances in Electroceramic Materials - Pittsburgh, PA, United States Duration: Oct 5 2008 → Oct 9 2008

Publication series

Name	Ceramic Transactions
Volume	204
ISSN (Print)	1042-1122

Conference

Conference	Advances in Electroceramic Materials
Country/Territory	United States
City	Pittsburgh, PA
Period	10/5/08 → 10/9/08

Access to Document

10.1002/9780470528990.ch20

Cite this

Ubic, R., Subodh, G., Sebastian, M. T., Gout, D., & Proffen, T. (2009). Effective size of vacancies in the Sr_1-3x/2Ce _xTiO₃ superstructure. In Advances in Electroceramic Materials - A Collection of Papers Presented at the 2008 Materials Science and Technology Conference (MS and T08) (pp. 177-185). (Ceramic Transactions; Vol. 204). American Ceramic Society. https://doi.org/10.1002/9780470528990.ch20

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abstract = "Four compositions in the Sr2-3x/2CexTiO3 homologous series corresponding to x = 0.1333, 0.1667, 0.1818, 0.25, and 0.4 have been synthesized by mixed-oxide processing and crystallographically characterized by electron diffraction. A non-cubic perovskite superlattice is observed for each composition caused by antiphase octahedral tilting. The degree of tilt increases with increasing x. Structural refinements of neutron diffraction data previously published indicate that the A-site size decreases with increasing x, but not as much as would be expected if vacancies were truly zero-dimensional defects; instead, A-site vacancies posses an effective finite size, presumably due to mutual repulsion of the coordinating oxygen ions. Based on these results, modifications to the predictive formula for pseudocubic lattice constant are proposed and seem successful for several systems with disordered A-site vacancies.",

author = "Rick Ubic and Ganesanpotti Subodh and Sebastian, {Mailadil T.} and Dclphine Gout and Thomas Proffen",

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Ubic, R, Subodh, G, Sebastian, MT, Gout, D & Proffen, T 2009, Effective size of vacancies in the Sr_1-3x/2Ce _xTiO₃ superstructure. in Advances in Electroceramic Materials - A Collection of Papers Presented at the 2008 Materials Science and Technology Conference (MS and T08). Ceramic Transactions, vol. 204, American Ceramic Society, pp. 177-185, Advances in Electroceramic Materials, Pittsburgh, PA, United States, 10/5/08. https://doi.org/10.1002/9780470528990.ch20

Effective size of vacancies in the Sr_1-3x/2Ce _xTiO₃ superstructure. / Ubic, Rick; Subodh, Ganesanpotti; Sebastian, Mailadil T. et al.
Advances in Electroceramic Materials - A Collection of Papers Presented at the 2008 Materials Science and Technology Conference (MS and T08). American Ceramic Society, 2009. p. 177-185 (Ceramic Transactions; Vol. 204).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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