Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Thermal structural characterization of the acentric layered perovskite LiHSrTa 2 O 7 : X-ray and neutron diffraction, SHG and Raman experiments

Abstract : The present work concerns the thermal structural characterization of the acentric Ruddlesden–Popper LiHSrTa2O7. A previous study, performed with powder neutron diffraction data, has revealed that at room temperature, LiHSrTa2O7 crystallizes in the Ama2 space group and that the acentric character is mainly due to the unequal distribution of the Li+ and H+ cations on their sites. In this new paper, the thermal behaviour has been studied by several techniques: powder X-ray and neutron diffraction, SHG experiments and Raman spectroscopy. All of them have revealed that LiHSrTa2O7 undergoes a reversible structural transition from an orthorhombic to a tetragonal symmetry around 200 °C. This transition is associated with the progressive vanishing of the TaO6 octahedra tilting, becoming completely straight in the high temperature form (S.G. I4/mmm), and with a variation of the Li+ and H+ distribution in the interlayer spacing.
Type de document :
Article dans une revue
Liste complète des métadonnées

https://hal-univ-lemans.archives-ouvertes.fr/hal-01912595
Contributeur : Marie-Pierre Crosnier-Lopez <>
Soumis le : lundi 5 novembre 2018 - 15:03:40
Dernière modification le : mardi 6 octobre 2020 - 16:16:06

Identifiants

Citation

Cyrille Galven, Denis Mounier, Thierry Pagnier, Emmanuelle Suard, Françoise Le Berre, et al.. Thermal structural characterization of the acentric layered perovskite LiHSrTa 2 O 7 : X-ray and neutron diffraction, SHG and Raman experiments. Dalton Transactions, Royal Society of Chemistry, 2014, 43 (39), pp.14841 - 14850. ⟨10.1039/c4dt01723d⟩. ⟨hal-01912595⟩

Partager

Métriques

Consultations de la notice

316