Na-ion dynamics in the solid solution NaxCa1−xCr2O4 studied by muon spin rotation and neutron diffraction

Elisabetta Nocerino; Ola Kenji Forslund; Hiroya Sakurai; Nami Matsubara; Anton Zubayer; Federico Mazza; Stephen Cottrell; Akihiro Koda; Isao Watanabe; Akinori Hoshikawa; Takashi Saito; Jun Sugiyama; Yasmine Sassa; Martin Månsson

doi:10.1039/D3SE01097J

Na-ion dynamics in the solid solution Na_xCa_1−xCr₂O₄ studied by muon spin rotation and neutron diffraction

Elisabetta Nocerino,

*^a Ola Kenji Forslund,^bm Hiroya Sakurai,^c Nami Matsubara,^a Anton Zubayer,^d Federico Mazza,^e Stephen Cottrell,^f Akihiro Koda,^g Isao Watanabe,

^h Akinori Hoshikawa,

ⁱ Takashi Saito,^j Jun Sugiyama,

^kl Yasmine Sassa^a and Martin Månsson

*^a

Author affiliations

* Corresponding authors

^a Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, Sweden
E-mail: nocerino@kth.se, condmat@kth.se

^b Physik-Institut, Universität Zürich, Winterthurerstrasse 190, Zürich, Switzerland

^c National Institute for Materials Science, Namiki, Tsukuba, Ibaraki 305-0044, Japan

^d Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden

^e Insitute of Solid State Physics, TU Wien, Wiedner Haupstraße 8-10, AT-1040 Wien, Austria

^f ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot Oxon OX11 0QX, UK

^g Muon Science Laboratory and Condensed Matter Research Center, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK-IMSS), Tsukuba, Ibaraki 305-0801, Japan

^h Muon Science Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

ⁱ Frontier Research Center for Applied Atomic Sciences, Ibaraki University, IQBRC, 162-1 Shirakata, Tokai, Ibaraki 319-1106, Japan

^j Institute of Materials Structure Science, High Energy Accelerator Research Organization, 203-1 Shirakata, Tokai, Ibaraki 319-1107, Japan

^k Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan

^l Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan

^m Department of Physics and Astronomy, Uppsala University, Box 516, Uppsala, Sweden

Abstract

In this work we present a systematic set of measurements carried out by muon spin rotation/relaxation (μ⁺SR) and neutron powder diffraction (NPD) on the solid solution Na_xCa_1−xCr₂O₄. This study investigates Na-ion dynamics in the quasi-1D (Q1D) diffusion channels created by the honeycomb-like arrangement of CrO₆ octahedra, in the presence of defects introduced by Ca substitution. With increasing Ca content, the size of the diffusion channels is enlarged; however, this effect does not enhance the Na ion mobility. Instead the overall diffusivity is hampered by the local defects and the Na hopping probability is lowered. The diffusion mechanism in Na_xCa_1−xCr₂O₄ is proposed to be interstitial and the activation energy as well as diffusion coefficient are determined for all the members of the solid solution.

$Graphical abstract: Na-ion dynamics in the solid solution NaxCa1−xCr2O4 studied by muon spin rotation and neutron diffraction$

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Na-ion dynamics in the solid solution Na_xCa_1−xCr₂O₄ studied by muon spin rotation and neutron diffraction

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