Abstract
Local electronic structure was investigated by observing hyperfine interactions (HFI) in Calcium titanate (CTO) perovskite using time differential perturbed angular correlation (TDPAC) spectroscopy. CTO was synthesized by gel-combustion method and doped with (181Hf/181Ta) TDPAC probe to study chemical environment around probe atom. Study revealed presence of two sites characterized by different quadrupole interaction frequencies, ω1a = 203 (2) and ω1b = 160 (2) Mrad/s, but with similar asymmetry parameters, ηa = 0.47 (0.01) and ηb = 0.47 (0.03). Electric Field Gradient (EFG) calculated from HFI parameters are 3.12 (0.03) and 2.47 (0.03) × 1021 V/m2 for the two sites. Point charge model calculation concluded that the two sites have different EFG and corroborated the variation in EFG between two sites accurately. Plausible reasons for existence of two different HFIs at B-site of CTO perovskite is discussed.
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Acknowledgements
Authors thank Dr Rahul Tripathi (Head, Nuclear Chemistry Section, Radiochemistry Division) for his constant support during the work. Authors also thank Dr. Bal Govind Vats (SO/E, Fuel Chemistry Division) for XRD acquisition.
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AK: visualization, investigation, draft-writing and editing. MS: resources, investigation. BST: supervision, draft-proofing.
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Kumar, A., Sahu, M. & Tomar, B.S. Study of hyperfine interactions in calcium titanate perovskite using TDPAC spectroscopy. J Radioanal Nucl Chem (2024). https://doi.org/10.1007/s10967-024-09441-6
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DOI: https://doi.org/10.1007/s10967-024-09441-6