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Low-Temperature Multistep Topotactic Routes to New Mixed-Valence Perovskites

Published online by Cambridge University Press:  16 February 2011

J.N. Lalena ,
R.A. McIntyre ,
B.L. Cushing ,
K.A. Thomas ,
J.L. Heintz Jr. ,
C.T. Seip ,
C.J. O'Connor  and
J.B. Wiley
J.N. Lalena
Affiliation:
Department of Chemistry and the Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148-2820jwiley@uno.edu
R.A. McIntyre
Affiliation:
Department of Chemistry and the Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148-2820jwiley@uno.edu
B.L. Cushing
Affiliation:
Department of Chemistry and the Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148-2820jwiley@uno.edu
K.A. Thomas
Affiliation:
Department of Chemistry and the Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148-2820jwiley@uno.edu
J.L. Heintz Jr.
Affiliation:
Department of Chemistry and the Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148-2820jwiley@uno.edu
C.T. Seip
Affiliation:
Department of Chemistry and the Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148-2820jwiley@uno.edu
C.J. O'Connor
Affiliation:
Department of Chemistry and the Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148-2820jwiley@uno.edu
J.B. Wiley
Affiliation:
Department of Chemistry and the Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148-2820jwiley@uno.edu
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Abstract

Multistep topotactic routes are exploited to introduce mixed-valency into mixed-metal oxides at low temperatures (≤ 350°C). A new set of single- and triple-layered perovskites, Na1-x-yCax/2LaTiO4 and Na2-x+yCax/2La2Ti3O10, respectively, has been prepared by a combination of ion exchange and reductive intercalation. The single-layer series are metastable compounds. The magnetic and electronic behavior of the triple-layer titanate is consistent with Anderson localization effects, while those of the single-layer materials are more complex; samples demonstrate “Hurd-like” conductivity and an unusual magnetic response. The details of the synthesis and characterization of these materials are presented and their magnetic and electronic behavior discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 547: Symposium DD – Solid-State Chemistry of Inorganic Materials II , 1998 , 99
Copyright
Copyright © Materials Research Society 1999

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