Anisotropic properties of Ba1−xSrxFe12O19 single crystals

Single crystals of Ba1−xSrxFe12O19 with x = 0, 0.25, 0.5, 0.75, and 1 were grown from a Na2CO3 flux. The obtained crystals were hexagon shaped plates with edge lengths of up to one centimetre and a thickness of several millimetres. Phase purity was confirmed by X-ray powder diffraction of crushed sa...

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Bibliographic Details
Published in:CrystEngComm 2022-07, Vol.24 (28), p.5052-5059
Main Authors: Fricke, Tim, Ebbinghaus, Stefan G
Format: Article
Language:English
Subjects:
Coercivity
Curie temperature
Magnetic anisotropy
Magnetic measurement
Remanence
Single crystals
Sodium carbonate
Thermal expansion
X ray powder diffraction
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Summary:Single crystals of Ba1−xSrxFe12O19 with x = 0, 0.25, 0.5, 0.75, and 1 were grown from a Na2CO3 flux. The obtained crystals were hexagon shaped plates with edge lengths of up to one centimetre and a thickness of several millimetres. Phase purity was confirmed by X-ray powder diffraction of crushed samples. The evolution of cell parameters a and c as a function of x in combination with thermal expansion measurements reveal a pronounced (thermo)mechanical anisotropy. Magnetic measurements show an additional strong magnetic anisotropy with the c-axis being the easy-axis, as typical for M-type hexaferrites. The absence of a detectable remanence or coercivity indicates the soft magnetization of the crystals. A small influence of x on the saturation moment was found as well as a linear increase of the Curie temperature with rising Sr-content in the entire x-range.
ISSN:1466-8033
DOI:10.1039/d2ce00165a