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Salas OA, Getahun YW, Mandujano HC, Manciu F, Castellanos M, Lopez J, Garza Hernández R, Buturlim VB, Gofryk K, Bairwa D, Elizabeth S, Nair HS. Resilience of the Aurivillius structure upon La and Cr doping in a Bi 5Ti 3FeO 15 multiferroic. Dalton Trans 2024; 53:6423-6435. [PMID: 38506269 DOI: 10.1039/d4dt00159a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2024]
Abstract
Combining the experimental techniques of high-resolution X-ray diffraction, magnetometry, specific heat measurement, and X-ray photoelectron, Raman and dielectric spectroscopy techniques, we have studied the influence of La and Cr doping on the crystal structure and magnetism of the room temperature Aurivillius multiferroic Bi5Ti3FeO15 by investigating the physical properties of (Bi4La)Ti3FeO15 and Bi5Ti3 (Fe0.5Cr0.5)O15. The parent (Bi5Ti3FeO15) and the doped ((Bi4La)Ti3FeO15 and Bi5Ti3(Fe0.5Cr0.5)O15) compounds crystallize in the A21am space group, which is confirmed through our analysis of high-resolution synchrotron X-ray diffraction data obtained on phase-pure polycrystalline powders. We determined the oxidation states of the metal atoms in the studied compounds as Fe3+, Ti4+, Cr3+, and La3+ through the analysis of X-ray photoelectron spectroscopy data. The magnetic susceptibilities of the three compounds are marked by the absence of a long-range ordered ground state, but dominated by superparamagnetic clusters with dominant antiferromagnetic interactions. This signature of short-range magnetism is also seen in specific heat as a low temperature enhancement which is suppressed upon the application of external magnetic fields up to 8 T. Our dielectric spectroscopy experiments showed that the three studied compounds display similar features in the dielectric constant measured as a function of frequency. However, upon doping La at the Bi site, the width of the ferroelectric hysteresis loop increases for (Bi4La)Ti3FeO15 compared to that of the parent compound Bi5Ti3FeO15, and with Cr doping, Bi5Ti3(Fe0.5Cr0.5)O15 becomes a leaky dielectric. The resilience of the Aurivillius crystal structure towards doping of La at the Bi site and Cr at the Fe site is clearly seen in the bulk properties of magnetic susceptibility, specific heat and the average crystal structure. The relevance of changes in the local structure is evident from our Raman spectroscopy and X-ray pair distribution function studies.
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Affiliation(s)
- Omar Alejandro Salas
- Department of Physics, 500 W University Ave, The University of Texas at El Paso, El Paso, TX 79968, USA.
| | - Yohannes W Getahun
- Department of Physics, 500 W University Ave, The University of Texas at El Paso, El Paso, TX 79968, USA.
| | - H Cein Mandujano
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland, MD 20742, USA
| | - Felicia Manciu
- Department of Physics, 500 W University Ave, The University of Texas at El Paso, El Paso, TX 79968, USA.
| | - Mariana Castellanos
- Department of Physics, 500 W University Ave, The University of Texas at El Paso, El Paso, TX 79968, USA.
| | - Jorge Lopez
- Department of Physics, 500 W University Ave, The University of Texas at El Paso, El Paso, TX 79968, USA.
| | | | - Volodymir B Buturlim
- Glenn T. Seaborg Institute, Idaho National Laboratory, Idaho Falls, ID 83415, USA
| | - Krzysztof Gofryk
- Center for Quantum Actinide Science and Technology, Idaho National Laboratory, Idaho National Laboratory, Idaho Falls, ID 83415, USA
| | - Dhanpal Bairwa
- Department of Physics, Indian Institute of Science, Bangalore, 560012, India
| | - Suja Elizabeth
- Department of Physics, Indian Institute of Science, Bangalore, 560012, India
| | - Harikrishnan S Nair
- Department of Physics, 500 W University Ave, The University of Texas at El Paso, El Paso, TX 79968, USA.
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