> I would like to ask you about the recipe of Ti etchant.  We are going to
> etch a <50 nm thick Ti layer on epitaxial barium titanate.  Since this
> material must be unfamiliar with you, you don't forget about it.  I just
> want to know what kinds of etchant you usually fix for Ti etching.
> Thanks a lot in advance.
> T. Sophie Hamano

You can use 10 H2O : 1 H2O2 (30%) : 1 HF (49%).
My measured etch rate for sputtered titanium is 1.1 um/min = 1100 nm/min.

    --Kirt Williams, Ph.D.    consultant