Enhancement of ferromagnetism and multiferroicity in Ho doped Fe rich BiFeO3 |
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| Authors: | SK Pradhan BK Roul DR Sahu |
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| Institution: | 1. Institute of Materials Science, Planetarium Building, Bhubaneswar 751013, India;2. School of Physics, University of the Witwatersrand, Private Bag-3, Wits 2050, Johannesburg, South Africa;1. Department of Physics, Institute of Technical Education & Research, Siksha ‘O’ Anusandhan University, Khandagiri, Bhubaneswar 751030, Odisha, India;2. Institute of Materials Research and Engineering, A?STAR (Agency for Science Technology and Research), 3 Research Link, Singapore 117602, Singapore;1. Materials Science Lab, Department of Physics, Chaudhary Devi Lal University, Sirsa, 125055, India;2. Department of Physics, Guru Jambheshwar University of Science & Technology, Hisar, 125001, India;3. School of Sciences, Baddi University of Emerging Sciences and Technology, Baddi, Solan, 173205, India;4. Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Chennai, 600036, India;1. Department of Physics, Hindu College, University of Delhi, Delhi, India;2. Department of Physics, Hansraj College, University of Delhi, Delhi, India;1. Department of Physics, Saurashtra University, Rajkot 360005, India;2. Tata Institute of Fundamental Research, Mumbai 400005, India;3. Dr. S.S. Bhatnagar University Institute of Chemical Engineering and Technology, Punjab University, Chandigarh 160014, India;4. Nano Material Analysis Centre, Korean Institute of Science and Technology, Seoul 136-79, South Korea;5. Inter University Accelerator Centre, New Delhi 110067, India |
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| Abstract: | Crystalline solid solution of BiHoXFe1+XO3 (X=0, 0.05, 0.1, and 0.15) ceramics have been successfully synthesized by slow step sintering schedule. At particular value of X (X=0.1) the sample showed good crystallinity with almost impurity free phases. It was observed that at particular concentration of X (X=0.1), the sample showed enhanced M–H loop by Ho doping in presence of excess Fe. Furthermore, the M–H loop gets reduced with the increase in value of X (X=0.15). Compared to the pure BFO, the dielectric properties for X=0.1 composition are improved due to the decreased oxygen vacancies by the stabilized oxygen octahedron. Raman spectra over the frequency range of 100–1500 cm?1 have been systematically investigated with different concentrations of X. Besides the changes of the peak position and the line width of the all modes, the prominent frequency shift, the line broadening and variation of the intensity for the two-phonon mode between 1270 and 1280 cm?1 were observed with increase in value of X. All these results indicate the existence of strong spin–phonon coupling in Ho doped Fe rich BFO. |
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