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Cation Distribution in Aluminum‐Substituted Yttrium Iron Garnets by Mössbauer Effect Spectroscopy
Author(s) -
Czerlinsky E. R.,
Macmillan R. A.
Publication year - 1970
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19700410137
Subject(s) - mössbauer spectroscopy , octahedron , curie temperature , yttrium , quadrupole splitting , quadrupole , yttrium iron garnet , materials science , analytical chemistry (journal) , absorption (acoustics) , spectroscopy , nuclear magnetic resonance , chemistry , crystallography , atomic physics , ferromagnetism , condensed matter physics , crystal structure , metallurgy , physics , chromatography , oxide , quantum mechanics , composite material
As a part of continuing search for magnetic materials with improved properties and broader applicability in microwave devices, recoil‐free nuclear resonance absorption was measured on eleven different compositions of Y 3 Al t Fe 5− t O 12 powder specimens with t ranging from 0.39 to 4. To avoid magnetic line splitting, measurements were made above the Curie temperature. The quadrupole splittings of the Fe 57 nuclei in the garnet structure caused two absorption doublets for each composition. From the intensities of the lines, the distribution of Fe 3+ and Al 3+ on the tetrahedral and octahedral sites with regard to the composition was obtained. Some of the powders had been subjected to an identical and controlled heat treatment to establish their cation equilibrium at the same temperature. With both the cation distribution and the equilibrium temperature defined, the stabilization energy was determined for each compound. This quantity is a measure for the “site preference”, in our particular case of Al 3+ in AlYIG materials. The results on the distribution are compared with earlier work on AlYIG, GaYIG, and AlYGaG. The electric field gradients resulting from the position of the doublet lines are compared with other investigations on the same compounds.