57Fe Mössbauer Investigation of the Substitutional Effect of Praseodymium in 1-2-3 Compounds

E. Kuzmann; Z. Klencsár; Z. Homonnay; L. Pöppl; A. Vértes; M. Bódogh; I. Kotsis; A. Nath

doi:10.1023/a:1006753719787

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 246: Issue 1

57Fe Mössbauer Investigation of the Substitutional Effect of Praseodymium in 1-2-3 Compounds

Authors:

E. Kuzmann

E. Kuzmann Loránd Eötvös University Department of Nuclear Chemistry Budapest Hungary

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Z. Klencsár

Z. Klencsár Loránd Eötvös University Department of Nuclear Chemistry Budapest Hungary

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Z. Homonnay

Z. Homonnay Loránd Eötvös University Department of Nuclear Chemistry Budapest Hungary

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L. Pöppl

L. Pöppl Loránd Eötvös University Department of Nuclear Chemistry Budapest Hungary

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A. Vértes

A. Vértes Loránd Eötvös University Department of Nuclear Chemistry Budapest Hungary

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M. Bódogh

M. Bódogh University of Veszprém Department of Silicate Chemistry and Materials Engineering Veszprém Hungary

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I. Kotsis

I. Kotsis University of Veszprém Department of Silicate Chemistry and Materials Engineering Veszprém Hungary

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A. Nath

A. Nath Drexel University Department of Chemistry Philadelphia USA

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Pages:: 117–121

Online Publication Date:: 01 Nov 2004

Publication Date:: 17 Oct 2000

Article Category:: Research Article

DOI:: https://doi.org/10.1023/a:1006753719787

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Abstract

⁵⁷Fe Mössbauer spectroscopy measurements were performed on the perovskite compounds Eu_0.7Pr_0.3Ba₂(Cu_0.99⁵⁷Fe_0.01)₃O_7-, EuBa_1.5Pr_0.5(Cu_0.99⁵⁷Fe_0.01)₃O_7- and EuBa_1.3Pr_0.7(Cu_0.99⁵⁷Fe_0.01)₃O_7-. The observed ⁵⁷Fe Mössbauer spectra provided an evidence for the correct site assignment of subspectra originating from ⁵⁷Fe in different microenvironments. Apart from a minor component which was assigned to the ⁵⁷Fe in the Cu(2) site of the copper oxide plane, all the subspectra could be attributed to the ⁵⁷Fe in the Cu(1) copper oxide chain site with a fourfold (doublet D1), fivefold (doublet D2) or sixfold (doublet D3) oxygen coordination. In contrast, in the compound EuBa₂(Cu_0.99⁵⁷Fe_0.01)₃O_7- the 6-coordinated (D3) species has not been observed. The substitution of Pr for Eu or for Ba resulted in an increased occupancy of the O(5) antichain oxygen sites, which was explained by the charge neutrality criterion. Especially, the replacement of Ba²⁺ with Pr³⁺ led to an unusually high degree of occupancy of O(5) sites. In the ⁵⁷Fe Mössbauer spectra the relative area of the 6-coordinated species (D3) increased, and that of the 4-coordinated one (D1) vanished completely in the case when Pr was substituted for Ba. Furthermore, the proportion of the 6-coordinated (D3) species increased at the expense of the 5-coordinated (D2) one with an increasing concentration of Pr at the Ba site. These experimental results are consistent with the variety of Mössbauer results reported so far.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)