A Europium-151 Mössbauer Spectral Study of Eu₁₄MnP₁₁, Eu₁₄MnAs₁₁, and Eu₁₄MnSb₁₁

Author

Raphäel P. Hermann
Fernande Grandjean, Missouri University of Science and TechnologyFollow
Susan M. Kauzlarich
Jiong Jiang
Shawna R. Brown
Gary J. Long, Missouri University of Science and TechnologyFollow

Abstract

The europium-151 Mössbauer spectra of the Eu₁₄MnP₁₁, Eu₁₄MnAs₁₁, and Eu₁₄MnSb₁₁ Zintl compounds, measured between 4.2 and 100 K, reveal europium(II) for all four crystallographically inequivalent europium sites in Eu₁₄MnAs₁₁ and Eu₁₄MnSb₁₁ and europium(II) and europium(III) for the three 32g and the 16f europium sites in Eu₁₄MnP₁₁, respectively. Below the ordering temperatures of 52, 74, and 92 K, only very small hyperfine fields of 2-4 T are observed at the europium sites as a result of the polarization by the manganese magnetic moments. At 4.2 K, the europium(II) magnetic moments are ordered, and hyperfine fields of 24.4, 24.8, and 19.3 T are observed in Eu₁₄MnP ₁₁, Eu₁₄MnAs₁₁, and Eu₁₄MnSb₁₁, respectively, fields that are typical for magnetically ordered europium(II) ions. At 4.2 K the 16f europium(III) sites in Eu ₁₄MnP₁₁ experience a transferred hyperfine field of 33 T from the neighboring ordered europium(II) moments. Between its Curie temperature and 4.2 K, the europium-151 Mössbauer spectra of Eu₁₄MnSb ₁₁ reveal that the europium(II) moments order below ca. 13 K, i.e., below the second magnetic transition observed in magnetic measurements. Between their Curie temperatures and 4.2 K, the europium-151 Mössbauer spectra of Eu₁₄MnP₁₁ and Eu₁₄MnAs₁₁ are complex and have been analyzed with two models, models that give equivalently good fits. However, the second model in which the spectra are fit with a three-dimensional relaxation of the europium(II) and europium(III) hyperfine fields is preferred for its physical meaning and its reduced number of fitted parameters.

Recommended Citation

R. P. Hermann et al., "A Europium-151 Mössbauer Spectral Study of Eu₁₄MnP₁₁, Eu₁₄MnAs₁₁, and Eu₁₄MnSb₁₁," Inorganic Chemistry, vol. 43, no. 22, pp. 7005 - 7013, American Chemical Society (ACS), Nov 2004.

The definitive version is available at https://doi.org/10.1021/ic0491682

Department(s)

Chemistry

Keywords and Phrases

Antimony; Arsenic; Europium; Manganese; Phosphorus; Crystallography; Magnetism; Mössbauer Spectroscopy; Temperature

International Standard Serial Number (ISSN)

0020-1669

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2004 American Chemical Society (ACS), All rights reserved.

Publication Date

01 Nov 2004