Preparation of lithium silicon nitrides and their lithium ion conductivity

Hisanori Yamane, Shinichi Kikkawa, Mitsue Koizumi

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79 Citations (Scopus)


Six single phases were prepared by reactions of Li3N and Si3N4 at 1075 K and 1475 K in nitrogen stream. Chemical analysis showed that they were ideally formulated as LiSi2N3, Li2SiN3, Li18Si3N10, Li21Si3N11 and Li8SiN4. Their X-ray diffraction patterns could be indexed with the following lattice parameters except phase II, Li2SiN2: phase I, LiSi2N3; orthorhombic, a=9.198(3), b=5.307(2), c=4.779(2); phase III, Li5SiN3; cubic, a=4.7240(3); phase IV, Li18Si3N10; tetragonal, =14.168(4), c=14.353(8); phase V, Li21Si3N11; tetragonal, a=9.470(3), c=9.530(8); phase VI, Li8SiN4; tetragonal a=10.217(2), c=9.536(3) Å. The unit cell dimensions of phases III to VI were related to each other. All phases are lithium ion conductors. A new phase, Li8SiN4, has the highest lithium ion conductivity (5×10-2 Sm-1 at 400K) and the lowest activation energy (46kJ/mol) among the present products.

Original languageEnglish
Pages (from-to)183-191
Number of pages9
JournalSolid State Ionics
Issue number2-3
Publication statusPublished - 1987 Nov


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