Abstract
The present Time Differential Perturbed γ-γ Angular Correlation (TDPAC) measurements in bulk HfO2 report, for the first time, the presence of three regular sites at ambient condition, apart from the stable monoclinic phase (m-HfO2). Also, the effects of Gd impurity (5 at%) on HfO2 crystal structure was investigated by PAC. In pure HfO2, apart from the monoclinic component (~76%), four other minor frequency components have been found at room temperature. To further investigate the origin of these minor frequency components, PAC measurement at 673 K was performed. At 673 K, population of two of the four minor components was enhanced at the expense of the m-HfO2 as the population of m-HfO2 reduces to ~58%. On doping with 5 at% Gd, the population of monoclinic site drastically reduced to ~10% while one of the minor components got enhanced to a large extent (68%). The enhancements of the three minor components, both by temperature or by Gd impurity, indicate that these are the regular phases of HfO2 and could therefore be attributed to three orthorhombic phases of HfO2. The fourth minor component (5–10%) with values of ωQ ~ 7 Mrad/s, η = 0 can be assigned to crystalline defect site.
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05 September 2019
Due to technical constraints this article was published in volume 240:1 with erroneous article citation ID number 8 whereas this should have been 78 which is corrected as such. Springer Nature sincerely apologizes towards the author(s) for the inconvenience caused.
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Authors sincerely thank all the members at DHRUVA reactor, BARC, Mumbai, India for successfully producing the probe nuclei at desired activity level.
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This article is part of the Topical Collection on Proceedings of the International Conference on Hyperfine Interactions and their Applications (HYPERFINE 2019), Goa, India, 10-15 February 2019
Edited by S. N. Mishra, P. L. Paulose and R. Palit
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Banerjee, D., Dey, C.C., Raja, S.W. et al. Stability of monoclinic phase in pure and Gd-doped HfO2: a hyperfine interaction study. Hyperfine Interact 240, 78 (2019). https://doi.org/10.1007/s10751-019-1614-7
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DOI: https://doi.org/10.1007/s10751-019-1614-7