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Volume 45 All articles Published: 7 November 2022 Article ID 0224
ARKADEV ROY HIMAL BHATT V SRIHARI H K POSWAL S R VISHWAKARMA
Bipyramidal distortions play the governing role in physical properties of HoMnO$_3$ multiferroics. We have carried out angle-dispersive high pressure synchrotron X-ray diffraction experiments on hexagonal HoMnO$_3$ to find the evolution of bipyramidal parameters upon external compression. It is found that the average bond-lengths and bond-angles between Mn and O atoms depict significant reduction, which results in the distortion in MnO$_5$ bipyramidal structure athigh pressures. Further, since subtle variations in these distortions are used to compare the properties of hexagonal HoMnO$_3$ manganite series,
in-situ low temperature infrared spectroscopic studies of 10% Dy-doped HoMnO$_3$ have beencarried out to study the effect of further increase in R-site cationic radius on MnO$_5$ deformations. It is found that the phonon modes specifically related to the motion of Mn and O atoms inab -plane display irregularities near magnetic transition temperatures ($T_N$ and T$_{SR}$) via spin phonon coupling. Even a small increase in average ionic radius of rare-earth atom suppresses this anomalous behaviour and follows the trend of undoped hexagonal rare-earth manganites.
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Bulletin of Materials Science
Volume 46, 2023
All articles
Continuous Article Publishing mode
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Bulletin of Materials Science | News
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Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020 -
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Posted on July 25, 2019Click here for Editorial Note on CAP Mode
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