Effect of boron oxide on the ionic conductivity of the Li1.2Al0.2Zr0.1Ti1.7 (PO4)3 ceramics with the NASICON structure

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Resumo

Boron oxide is considered as a good dopant for improving the ionic conductivity of solid electrolytes. This effect is usually attributed to the optimization of grain boundary conductivity. In this work, the effect of addition of 1–4 wt. % boron oxide on the ionic conductivity of Li1.2Al0.2Zr0.1Ti1.7(PO4)3 with the NASICON structure was investigated. The obtained materials were characterized by XRD, SEM, Raman spectroscopy, IR spectroscopy, impedance spectroscopy and MAS 27Al, 7Li, 31P and 11B NMR. It was shown that the introduction of B2O3 at the stage of synthesis of Li1.2Al0.2Zr0.1Ti1.7(PO4)3 leads to the production of materials doped with boron ions. The highest conductivity (2.9 × 10–4 S/cm) at 25°C is characteristic of the sample with 2 wt. % boron oxide. At the same time, when B2O3 is added to the already prepared phosphate, it is predominantly localized at the interfaces, leads to the release of LiTiPO5 impurity and does not have a significant effect on the conductivity of the prepared samples.

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Sobre autores

A. Pyrkova

Kurnakov Institute of General and Inorganic Chemistry of Russian Academy of Sciences

Email: stenina@igic.ras.ru
Rússia, Moscow, 119991

I. Stenina

Kurnakov Institute of General and Inorganic Chemistry of Russian Academy of Sciences

Autor responsável pela correspondência
Email: stenina@igic.ras.ru
Rússia, Moscow, 119991

А. Yaroslavtsev

Kurnakov Institute of General and Inorganic Chemistry of Russian Academy of Sciences

Email: stenina@igic.ras.ru
Rússia, Moscow, 119991

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2. Fig. 1. X-ray diffraction patterns of materials LAZTP-xB-syn (a) and LAZTP-xB-bm (b). Boron content (wt. %): x = 0 (1), 1 (2), 2 (3), 4 (4). The asterisk indicates LiTiPO5 reflections.

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3. Fig. 2. CR spectra of materials based on Li1.2Al0.2Zr0.1Ti1.7(PO4)3: 1 - LAZTP-0B-syn, 2 - LAZTP-2B-syn, 3 - LAZTP-2B-bm.

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4. Fig. 3. Fragments of IR spectra of LAZTP-xB-syn (a) and LAZTP-xB-bm (b). Boron content (wt. %): x = 0 (1), 1 (2), 2 (3), 4 (4).

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5. Fig. 4. MAS NMR spectra at 27Al (a), 7Li (b), 31P (c) and 11B (d) nuclei of LAZTP-4B-syn (1) and LAZTP-4B-bm (2).

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6. Fig. 5. Surface micrographs of LAZTP-0B-syn (a), LAZTP-1B-syn (b), LAZTP-2B-syn (c), LAZTP-4B-syn (d), LAZTP-0B-bm (e) and LAZTP-4B-bm (f) tablets.

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7. Fig. 6. Temperature dependences of the total conductivity for the materials LAZTP-xB-syn (a) and LAZTP-xB-bm (b).

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