Structure and electronic properties of CaAl12−xFexO19 hibonites

B. A. Duell; Jun Li; P. G. LaBarre; J. J. Zhang; R. P. Hermann; A. P. Ramirez; M. A. Subramanian

doi:10.1016/j.jssc.2020.121650

Structure and electronic properties of CaAl_12−xFe_xO₁₉ hibonites

B. A. Duell, Jun Li, P. G. LaBarre, J. J. Zhang, R. P. Hermann, A. P. Ramirez, M. A. Subramanian

Neutron & X-Ray Scattering, & Thermophys

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

Dilution of iron in the AM₁₂O₁₉ has shown promising coupling of magnetic and electric properties in the hexaferrites. We have prepared samples of low iron content in the isostructural hibonite, CaAl_12−xFe_xO₁₉, to investigate the structural effects of larger iron substitution into the aluminum sites and the resultant properties. We found a solid solution exists for CaAl_12−xFe_xO₁₉ where x ≤ 5.5. Iron distributes into all sites with the tetrahedral M3 and octahedral M5 sites displaying nominally larger preference at higher Fe content. Paramagnetic behavior was observed for x = 1–3, while x = 4–5.5 displayed a broad ferromagnetic-like transition with increasing Curie temperature. Differences in field-cooled and zero-field-cooled magnetic susceptibility measurements and low magnetic moment indicate the presence of a frustrated antiferromagnetic structure as the source of the ferromagnetic-like behavior. Increasing Fe content also increases the dielectric constant up to 21 at room temperature with high dielectric loss.

Original language	English
Article number	121650
Journal	Journal of Solid State Chemistry
Volume	291
DOIs	https://doi.org/10.1016/j.jssc.2020.121650
State	Published - Nov 2020

Funding

Mössbauer spectroscopy work by J.J.Z. and R.P.H. was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences , Materials Sciences and Engineering Division . This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).This work was supported by NSF Grant Nos. DMR-1508527 (M.A.S.) and DMR-1534741 (A.P.R.). The authors would like to acknowledge support of the National Institute of Standards and Technology, U.S. Department of Commerce, in providing the neutron research facilities used and thank Dr. Judith K. Stalick for data collection. The identification of any commercial product or trade name does not imply endorsement or recommendation by the National Institute of Standards and Technology. M?ssbauer spectroscopy work by J.J.Z. and R.P.H. was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division. This work was supported by NSF Grant Nos. DMR-1508527 (M.A.S.) and DMR-1534741 (A.P.R.). The authors would like to acknowledge support of the National Institute of Standards and Technology, U.S. Department of Commerce, in providing the neutron research facilities used and thank Dr. Judith K. Stalick for data collection. The identification of any commercial product or trade name does not imply endorsement or recommendation by the National Institute of Standards and Technology.

Funders	Funder number
DOE Public Access Plan
Office of Basic Energy Sciences
United States Government
National Science Foundation	DMR-1534741, DMR-1508527
U.S. Department of Energy
National Institute of Standards and Technology
U.S. Department of Commerce
Office of Science
Basic Energy Sciences
Division of Materials Sciences and Engineering

Keywords

Dielectric
Hibonite
Magnetism
Mossbauer

Access to Document

10.1016/j.jssc.2020.121650

Cite this

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title = "Structure and electronic properties of CaAl12−xFexO19 hibonites",

abstract = "Dilution of iron in the AM12O19 has shown promising coupling of magnetic and electric properties in the hexaferrites. We have prepared samples of low iron content in the isostructural hibonite, CaAl12−xFexO19, to investigate the structural effects of larger iron substitution into the aluminum sites and the resultant properties. We found a solid solution exists for CaAl12−xFexO19 where x ≤ 5.5. Iron distributes into all sites with the tetrahedral M3 and octahedral M5 sites displaying nominally larger preference at higher Fe content. Paramagnetic behavior was observed for x = 1–3, while x = 4–5.5 displayed a broad ferromagnetic-like transition with increasing Curie temperature. Differences in field-cooled and zero-field-cooled magnetic susceptibility measurements and low magnetic moment indicate the presence of a frustrated antiferromagnetic structure as the source of the ferromagnetic-like behavior. Increasing Fe content also increases the dielectric constant up to 21 at room temperature with high dielectric loss.",

keywords = "Dielectric, Hibonite, Magnetism, Mossbauer",

author = "Duell, {B. A.} and Jun Li and LaBarre, {P. G.} and Zhang, {J. J.} and Hermann, {R. P.} and Ramirez, {A. P.} and Subramanian, {M. A.}",

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T1 - Structure and electronic properties of CaAl12−xFexO19 hibonites

AU - Duell, B. A.

AU - Li, Jun

AU - LaBarre, P. G.

AU - Zhang, J. J.

AU - Hermann, R. P.

AU - Ramirez, A. P.

AU - Subramanian, M. A.

PY - 2020/11

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N2 - Dilution of iron in the AM12O19 has shown promising coupling of magnetic and electric properties in the hexaferrites. We have prepared samples of low iron content in the isostructural hibonite, CaAl12−xFexO19, to investigate the structural effects of larger iron substitution into the aluminum sites and the resultant properties. We found a solid solution exists for CaAl12−xFexO19 where x ≤ 5.5. Iron distributes into all sites with the tetrahedral M3 and octahedral M5 sites displaying nominally larger preference at higher Fe content. Paramagnetic behavior was observed for x = 1–3, while x = 4–5.5 displayed a broad ferromagnetic-like transition with increasing Curie temperature. Differences in field-cooled and zero-field-cooled magnetic susceptibility measurements and low magnetic moment indicate the presence of a frustrated antiferromagnetic structure as the source of the ferromagnetic-like behavior. Increasing Fe content also increases the dielectric constant up to 21 at room temperature with high dielectric loss.

AB - Dilution of iron in the AM12O19 has shown promising coupling of magnetic and electric properties in the hexaferrites. We have prepared samples of low iron content in the isostructural hibonite, CaAl12−xFexO19, to investigate the structural effects of larger iron substitution into the aluminum sites and the resultant properties. We found a solid solution exists for CaAl12−xFexO19 where x ≤ 5.5. Iron distributes into all sites with the tetrahedral M3 and octahedral M5 sites displaying nominally larger preference at higher Fe content. Paramagnetic behavior was observed for x = 1–3, while x = 4–5.5 displayed a broad ferromagnetic-like transition with increasing Curie temperature. Differences in field-cooled and zero-field-cooled magnetic susceptibility measurements and low magnetic moment indicate the presence of a frustrated antiferromagnetic structure as the source of the ferromagnetic-like behavior. Increasing Fe content also increases the dielectric constant up to 21 at room temperature with high dielectric loss.

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KW - Magnetism

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