Alignment of strontium hexaferrite, by cold compaction of anisotropic non-magnetically interacting crystallites

Cold compacted, anisotropic shaped non-magnetically interacting precursors are used to achieve aligned strontium hexaferrites. The simple process of dry mixing platy hematite and/or rod-like goethite with strontium carbonate removes the need for external magnetic fields or high temperatures during c...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2022-03, Vol.51 (1), p.3884-3893
Main Authors: Thomas-Hunt, Jack, Povlsen, Amalie, Vijayan, Harikrishnan, Knudsen, Cecilie Grønvaldt, Gjørup, Frederik H, Christensen, Mogens
Format: Article
Language:English
Subjects:
Alignment
Crystallites
Crystallography
Hematite
High temperature
Magnetic measurement
Preferred orientation
Strontium
Strontium carbonate
Synchrotrons
Two dimensional analysis
X ray powder diffraction
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Summary:Cold compacted, anisotropic shaped non-magnetically interacting precursors are used to achieve aligned strontium hexaferrites. The simple process of dry mixing platy hematite and/or rod-like goethite with strontium carbonate removes the need for external magnetic fields or high temperatures during compaction to assist in alignment. The calcined strontium hexaferrite pellets all displayed preferred orientation and high levels of phase purity (>99 wt%). The mix of goethite and strontium carbonate achieved the highest degree of magnetic alignment with M r / M s reaching 0.83(1) obtained by vibrating sample magnetometry. The magnetic data were supported by examining crystallographic alignment using powder X-ray diffraction as well as 2D texture synchrotron analysis. Goethite and hematite with targeted morphologies dry mixed and cold-pressed with SrCO 3 , with subsequent sintering to achieve highly aligned hexaferrite. Goethite needles offered the best alignment both magnetically and crystallographically.
ISSN:1477-9226
1477-9234
DOI:10.1039/d2dt00062h