BaNdFeO₄ revisited: true phase composition, magnetic structure evolution, and broadband microwave absorption in an intrinsic self-composite.
7 affiliations
- 1Department of Engineering Physics, Hochiminh City University of Technology and Engineering Ho Chi Minh City Vietnam.
- 2Department of Physics, Le Quy Don Technical University Hanoi 100000 Vietnam.
- 3Department of Physics, Ho Chi Minh City University of Education 700000 Ho Chi Minh Vietnam.
- 4Faculty of Engineering Physics and Nanotechnology, VNU-University of Engineering and Technology 144 Xuan Thuy, Cau Giay 100000 Hanoi Vietnam.
- 5Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research 141980 Dubna Russia.
- 6Faculty of Natural Sciences, Duy Tan University 550000 Danang Vietnam [email protected].
- 7Institute of Research and Development, Duy Tan University 550000 Danang Vietnam.
Abstract
Nominal BaNdFeO₄ has previously been regarded as a single-phase rare-earth ferrite; however, its true phase constitution and intrinsic functional properties remain insufficiently clarified. In this work, we revisit the nominal BaNdFeO₄ composition and demonstrate that it does not form as a single-phase compound, but rather as an intrinsic Ba-Nd-Fe-O self-composite predominantly consisting of Ba₆Nd₂Fe₄O₁₅ and BaNd₂Fe₂O₇ with comparable weight fractions. Combined X-ray diffraction, neutron powder diffraction, and morphological characterization, and energy-dispersive X-ray spectroscopy analyses provide consistent evidence for this revised phase composition. Neutron diffraction further reveals a previously unreported magnetic structure evolution in BaNd₂Fe₂O₇, in which an in-plane Fe-sublattice antiferromagnetic state with k ₁ = (0, 0, 0) is established at room temperature and progressively rotates toward the c axis near 20 K with the onset of Nd magnetic ordering. Meanwhile, Ba₆Nd₂Fe₄O₁₅ develops long-range collinear antiferromagnetic ordering of both Fe and Nd ions below T N ≈ 18 K with a magnetic propagation vector k ₂ = (1/2, 0, 0). The intrinsic coexistence of these structurally and magnetically distinct phases produces an interface-rich and defect-prone microstructure that promotes dielectric-dominant broadband microwave absorption. Reflection-loss analysis reveals thickness-tunable absorption governed by effective impedance matching and quarter-wavelength interference, yielding a maximum effective absorption bandwidth of approximately 5.3 GHz at a thickness of ∼5.0 mm. These findings underscore the potential of this Ba-Nd-Fe-O intrinsic self-composite as a promising chemically stable oxide for broadband electromagnetic wave attenuation.
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BibTeX
@article{tran2026bandfeo₄,
title = {{BaNdFeO₄ revisited: true phase composition, magnetic structure evolution, and broadband microwave absorption in an intrinsic self-composite.}},
author = {T A Tran and D Q Tran and L S Hai and N L V Thanh and T K C Tran and N L Phan and H C Tran and G A V Phan and V A Dao and D H Ta and T L Phan and S E Kichanov and A V Rutkauskas and T P Hoang and N T Dang},
journal = {RSC advances},
year = {2026},
month = oct,
doi = {10.1039/d6ra06375f},
url = {https://europepmc.org/article/MED/42903601},
note = {CC BY-NC},
}
RIS
TY - JOUR
TI - BaNdFeO₄ revisited: true phase composition, magnetic structure evolution, and broadband microwave absorption in an intrinsic self-composite.
AU - T A Tran
AU - D Q Tran
AU - L S Hai
AU - N L V Thanh
AU - T K C Tran
AU - N L Phan
AU - H C Tran
AU - G A V Phan
AU - V A Dao
AU - D H Ta
AU - T L Phan
AU - S E Kichanov
AU - A V Rutkauskas
AU - T P Hoang
AU - N T Dang
PY - 2026
DA - 2026/10/20
JO - RSC advances
DO - 10.1039/d6ra06375f
UR - https://europepmc.org/article/MED/42903601
AB - Nominal BaNdFeO₄ has previously been regarded as a single-phase rare-earth ferrite; however, its true phase constitution and intrinsic functional properties remain insufficiently clarified. In this work, we revisit the nominal BaNdFeO₄ composition and demonstrate that it does not form as a single-phase compound, but rather as an intrinsic Ba-Nd-Fe-O self-composite predominantly consisting of Ba₆Nd₂Fe₄O₁₅ and BaNd₂Fe₂O₇ with comparable weight fractions. Combined X-ray diffraction, neutron powder diffraction, and morphological characterization, and energy-dispersive X-ray spectroscopy analyses provide consistent evidence for this revised phase composition. Neutron diffraction further reveals a previously unreported magnetic structure evolution in BaNd₂Fe₂O₇, in which an in-plane Fe-sublattice antiferromagnetic state with k ₁ = (0, 0, 0) is established at room temperature and progressively rotates toward the c axis near 20 K with the onset of Nd magnetic ordering. Meanwhile, Ba₆Nd₂Fe₄O₁₅ develops long-range collinear antiferromagnetic ordering of both Fe and Nd ions below T N ≈ 18 K with a magnetic propagation vector k ₂ = (1/2, 0, 0). The intrinsic coexistence of these structurally and magnetically distinct phases produces an interface-rich and defect-prone microstructure that promotes dielectric-dominant broadband microwave absorption. Reflection-loss analysis reveals thickness-tunable absorption governed by effective impedance matching and quarter-wavelength interference, yielding a maximum effective absorption bandwidth of approximately 5.3 GHz at a thickness of ∼5.0 mm. These findings underscore the potential of this Ba-Nd-Fe-O intrinsic self-composite as a promising chemically stable oxide for broadband electromagnetic wave attenuation.
SN - 2046-2069
ER -