Abstract
The recently observed ferroelectricity in thin films of pure and doped Hafnium oxide (HfO2) has initiated a sustaining effort to stabilize its ferroelectric phase which is the polar orthorhombic (o) phase with space group Pca21. This polar o-phase of the oxide does not appear in its phase transition sequence and is also not thought to be stabilized in bulk oxide. Here, we report the stabilization of three o-phases of this oxide in bulk with space groups Pbca, Pca21 and Pbcm in presence of Yttrium (Y) dopant. For inducing o-phase, 10 at% of Y-dopant has been used and temperature mediated phase transformation from monoclinic (m) to o-phase has been observed. The third o-phase with space group Pbcm could be stabilized for the first time in bulk oxide by Y-dopant. All the o-phases in presence of m-phase could be identified by Time Differential Perturbed γ-γ Angular Correlation (TDPAC) Spectroscopy. The TDPAC parameters assigned to Pbcm phase confirm the theoretical modelization for the phase performed by Wien2K calculation based on Density Functional Theory (DFT). The present work reports the possibility of stabilizing different o-phases including polar one and shows the widening of scope of this oxide for future ferroelectric applications.
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Acknowledgements
The data analysis for the PAC spectra were carried out using the software WINFIT developed by Prof. Dr. T. Butz, Leipzig University, Germany. Mr. A. K. Biswas of Radiochemistry laboratory RCD (BARC), VECC, Kolkata, India is thankfully acknowledged for his help during sample preparation. Authors sincerely thank all the members at DHRUVA reactor, BARC, Mumbai, India for successfully producing the probe nuclei at desired activity level. One of the authors, D. Banerjee, sincerely acknowledges Dr. R. Acharya, Head, Nuclear Analytical and Accelerator Chemistry Section, RCD, BARC, Mumbai, India and Dr. P. K. Pujari, Director, Radiochemistry and Isotope Group, BARC, Mumbai, India for their keen interest and support in the work.
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This article is part of the Topical collection on Proceedings of the International Conference on Hyperfine Interactions (HYPERFINE 2021), 5-10 September 2021, Brasov, Romania
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Banerjee, D., Dey, C.C., Sewak, R. et al. Orthorhombic structure stabilazation in bulk HfO2 by yttrium doping. Hyperfine Interact 242, 31 (2021). https://doi.org/10.1007/s10751-021-01765-z
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DOI: https://doi.org/10.1007/s10751-021-01765-z