The Study of the Formation of Solid Solutions of Lithium in Iridium

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Abstract

The interaction in the Li-Ir system using Li3N as a lithium source was studied depending on the temperature, heat treatment time and total pressure in the system. Using X-ray phase analysis (XRD), it was shown that heat treatment of a powder mixture of Li3N and Ir in a graphite or BN crucible in the temperature range of 800–1200°C leads to the formation of a substitution solid solution of Ir(Li), with the lithium content decreasing with increasing temperature, heat treatment time and decreasing total pressure in the system. The maximum lithium content in iridium reached 6.2% at. It was shown that the use of a closed BN container increases the yield of the Ir(Li) solid solution. The use of graphite or BN crucibles prevents the formation of intermetallic compounds of the Li-Ir system.

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About the authors

V. V. Lozanov

Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Author for correspondence.
Email: lozanov.25@yandex.ru
Russian Federation, 18, Kutateladze St., Novosibirsk, 630090; 1, Pirogov St., Novosibirsk, 630090

M. A. Golosov

Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences

Email: lozanov.25@yandex.ru
Russian Federation, 18, Kutateladze St., Novosibirsk, 630090

D. V. Valyaev

Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Email: lozanov.25@yandex.ru
Russian Federation, 18, Kutateladze St., Novosibirsk, 630090; 1, Pirogov St., Novosibirsk, 630090

Ya. A. Nikiforov

Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences

Email: lozanov.25@yandex.ru
Russian Federation, 18, Kutateladze St., Novosibirsk, 630090

A. V. Utkin

Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Email: lozanov.25@yandex.ru
Russian Federation, 18, Kutateladze St., Novosibirsk, 630090; 1, Pirogov St., Novosibirsk, 630090

N. I. Baklanova

Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences

Email: lozanov.25@yandex.ru
Russian Federation, 18, Kutateladze St., Novosibirsk, 630090

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Supplementary files

Supplementary Files
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2. Fig. 1. Diffractograms (a) of Li3N after rubbing in agate mortar in paraffin (1) and in air (2); SEM image of lithium nitride crystal (b).

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3. Fig. 2. X-ray diffraction data of sample 1.

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4. Fig. 3. Reflections of (331) and (420) iridium in samples after heat treatment in vacuum (Ir-800, samples 1-8).

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5. Fig. 4. Reflexes of (331) and (420) iridium in samples after heat treatment in vacuum (Ir-800, sample 9) and argon (sample 10).

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6. Fig. 5. Reflexes (331) and (420) of iridium in samples 11-13 heated in argon in a graphite crucible (a) and lithium content in Ir(Li) solid solutions (b).

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7. Fig. 6. Reflexes of (331) and (420) iridium in samples 14 and 15 heated in BN crucibles.

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8. Fig. 7. XRF data of sample 16 compared to samples 9 and 10.

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