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Communication Dans Un Congrès Année : 2023

Using total scattering techniques to explore fundamental aspects of the structural organization in weberite-type tantalate oxides

Résumé

Weberite-type tantalate oxides (A3TaO7) are promising candidates for many energy-related applications. However, there is only a limited understanding of how their atomic-scale structure changes under exposure to extreme conditions. We performed neutron total scattering experiments across a compositional range of oxides and analyzed the real space, short-range pair correlation functions to establish evidence that their local atomic arrangements adopt organization different from their well-known long-range structure. This finding appears to be a general phenomenon for a range of weberite-type oxides, spanning from fully ordered (Pr3TaO7) to fully disordered (Yb3TaO7). Furthermore, comparing short- and long-range structural behaviors across the compositional series has revealed a complex organization of structural length scales: the short-range analysis suggests a strong dependence on the ionic radius of the A-site cation and the distortion of a local structural motif that monotonically increases across the compositional series, while the long-range analysis confirmed the existence of three distinct structures.
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Dates et versions

hal-04093524 , version 1 (10-05-2023)

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Paternité - Pas d'utilisation commerciale

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  • HAL Id : hal-04093524 , version 1

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Igor Gussev, Gianguido Baldinozzi, Eric C. O'Quinn, Joerg C Neuefeind, Maik Lang. Using total scattering techniques to explore fundamental aspects of the structural organization in weberite-type tantalate oxides. MS&T23: Materials Science & Technology, The American Ceramic Society (ACerS); The Association for Iron & Steel Technology (AIST); The Minerals, Metals & Materials Society (TMS), Oct 2023, Columbus, Ohio, United States. ⟨hal-04093524⟩
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