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Title: Metal valences in electron-doped (Sr,La){sub 2}FeTaO{sub 6} double perovskite: A {sup 57}Fe Moessbauer spectroscopy study

Abstract

Substitution of divalent Sr by trivalent La is found to affect the valence states of both of the two B-site cations, Fe and Ta, in the double perovskite oxide (Sr{sub 1-} {sub x} La {sub x} ){sub 2}FeTaO{sub 6}. Moreover, it improves the degree of order of these cations. From {sup 57}Fe Moessbauer spectra the average Fe valence was found to decrease with increasing La substitution level, x. However, the valence of Fe decreased less than expected if the valence of Ta was assumed to remain constant. Hence, we conclude that also the valence of Ta decreases. - Graphical abstract: Both the degree of order and the valence states of Fe and Ta are controlled in the (Sr{sub 1-} {sub x} La {sub x} ){sub 2}FeTaO{sub 6} double perovskite oxide through aliovalent La{sup III}-for-Sr{sup II} substitution.

Authors:
 [1];  [2];  [3];  [1];  [1];  [4]
  1. Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503 (Japan)
  2. (Finland)
  3. Physics Department, Abo Akademi, FI-20500 Turku (Finland)
  4. (Finland), E-mail: Maarit.Karppinen@tkk.fi
Publication Date:
OSTI Identifier:
21015668
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 180; Journal Issue: 2; Other Information: DOI: 10.1016/j.jssc.2006.10.034; PII: S0022-4596(06)00582-2; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CATIONS; DOPED MATERIALS; IRON COMPOUNDS; LANTHANUM COMPOUNDS; MOESSBAUER EFFECT; OXIDES; PEROVSKITE; STRONTIUM COMPOUNDS; TANTALUM COMPOUNDS; VALENCE

Citation Formats

Rautama, E.-L., Laboratory of Inorganic and Analytical Chemistry, Helsinki University of Technology, FI-02015 TKK, Linden, J., Yamauchi, H., Karppinen, M., and Laboratory of Inorganic and Analytical Chemistry, Helsinki University of Technology, FI-02015 TKK. Metal valences in electron-doped (Sr,La){sub 2}FeTaO{sub 6} double perovskite: A {sup 57}Fe Moessbauer spectroscopy study. United States: N. p., 2007. Web. doi:10.1016/j.jssc.2006.10.034.
Rautama, E.-L., Laboratory of Inorganic and Analytical Chemistry, Helsinki University of Technology, FI-02015 TKK, Linden, J., Yamauchi, H., Karppinen, M., & Laboratory of Inorganic and Analytical Chemistry, Helsinki University of Technology, FI-02015 TKK. Metal valences in electron-doped (Sr,La){sub 2}FeTaO{sub 6} double perovskite: A {sup 57}Fe Moessbauer spectroscopy study. United States. doi:10.1016/j.jssc.2006.10.034.
Rautama, E.-L., Laboratory of Inorganic and Analytical Chemistry, Helsinki University of Technology, FI-02015 TKK, Linden, J., Yamauchi, H., Karppinen, M., and Laboratory of Inorganic and Analytical Chemistry, Helsinki University of Technology, FI-02015 TKK. Thu . "Metal valences in electron-doped (Sr,La){sub 2}FeTaO{sub 6} double perovskite: A {sup 57}Fe Moessbauer spectroscopy study". United States. doi:10.1016/j.jssc.2006.10.034.
@article{osti_21015668,
title = {Metal valences in electron-doped (Sr,La){sub 2}FeTaO{sub 6} double perovskite: A {sup 57}Fe Moessbauer spectroscopy study},
author = {Rautama, E.-L. and Laboratory of Inorganic and Analytical Chemistry, Helsinki University of Technology, FI-02015 TKK and Linden, J. and Yamauchi, H. and Karppinen, M. and Laboratory of Inorganic and Analytical Chemistry, Helsinki University of Technology, FI-02015 TKK},
abstractNote = {Substitution of divalent Sr by trivalent La is found to affect the valence states of both of the two B-site cations, Fe and Ta, in the double perovskite oxide (Sr{sub 1-} {sub x} La {sub x} ){sub 2}FeTaO{sub 6}. Moreover, it improves the degree of order of these cations. From {sup 57}Fe Moessbauer spectra the average Fe valence was found to decrease with increasing La substitution level, x. However, the valence of Fe decreased less than expected if the valence of Ta was assumed to remain constant. Hence, we conclude that also the valence of Ta decreases. - Graphical abstract: Both the degree of order and the valence states of Fe and Ta are controlled in the (Sr{sub 1-} {sub x} La {sub x} ){sub 2}FeTaO{sub 6} double perovskite oxide through aliovalent La{sup III}-for-Sr{sup II} substitution.},
doi = {10.1016/j.jssc.2006.10.034},
journal = {Journal of Solid State Chemistry},
number = 2,
volume = 180,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}