Differential etch rates in z-cut LiNbO3 for variable HF/HNO3 concentrations

Collin L. Sones, Sakellaris Mailis, William S. Brocklesby, Robert W. Eason, John R. Owen

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92 Citations (Scopus)


We report the experimental measurements for etch rates of the +z and -z faces of single crystal lithium niobate immersed in HF and HNO3 acid mixtures of varying ratios. We find that pure HF produces an etch rate that is a factor of 2 higher than the rate obtained for the more frequently used mixture of HF/HNO3 in a 1:2 ratio. We further observe that the quality of etching is improved for either pure HF or HF/HNO3 in a 1:4 ratio, again by comparison with use of a 1:2 ratio. These results lead to a discussion of the etch chemistry involved, and an explanation for the observed high degree of differential etching between the +z and -z crystal faces.

Original languageEnglish
Pages (from-to)295-298
Number of pages4
JournalJournal of Materials Chemistry
Issue number2
Publication statusPublished - 2002
Externally publishedYes


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