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Diffusion of Niobium in Congruent Lithium Niobate

✍ Scribed by Born, E. ;Hornsteiner, J. ;Metzger, T. ;Riha, E.

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 350 KB
Volume: 177
Category: Article
ISSN: 0031-8965
DOI: 10.1002/(sici)1521-396x(200002)177:2<393::aid-pssa393>3.0.co;2-f

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✦ Synopsis

According to the phase diagram of lithium niobate (LN) a decomposition of congruently melting LN with segregation of a niobium rich phase LiNb 3 O 8 (L3N) has been observed. It occurs at the surface and at defects within the LN crystals at temperatures significantly higher than 300 C. L3N crystals grow epitaxially towering the wafer surface and decorating defects within the bulk. Thus a niobium (Nb Li ) diffusion besides the lithium (Li Li , Li vac ) diffusion out of the bulk and at the surface is concluded. Moreover, shallow grooves surrounding the L3N segregation at the surface indicate a Nb Nb diffusion only at the surface and along crystal defects. Niobium (Nb Li ) diffusion pathways in the lattice are discussed.

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