Not sure why a Sn label appears at 0.3keV??
As you know, there exist more than a few peak overlaps and Sn-Ca is
classic, fyi.. CaKα 3.7keV, CaLα0.3, SnLα 3.4
I recommend a rescan point and ID, much higher mag, and increase your
accelerating voltage so you can look at binding energies in 10keV+ range..
Bhanu
On Wed, Dec 9, 2015 at 7:55 PM, Vladimir Igoshev <[log in to unmask]
> wrote:
> No underfill or any other fancy stuff
>
> ---- On Wed, 09 Dec 2015 16:53:28 -0800 Yuan-chia Joyce Koo<
> [log in to unmask]> wrote ----
> > tin oxalyate used for epoxy catalyst... there were works for flux/
> > underfill one step stuff utilize flux by product as catalyst for
> > curing... (can't remember which group did that...)
> > jk
> > On Dec 9, 2015, at 7:03 PM, Vladimir Igoshev wrote:
> >
> > > Hi Dave,
> > >
> > > Not really. It doesn't "burn" or "curl" much under the beam, so
> > > it's solid.
> > >
> > > Vladimir
> > >
> > > ---- On Wed, 09 Dec 2015 15:51:29 -0800 David
> > > Hillman<[log in to unmask]> wrote ----
> > >> Thank you Steve!
> > >>
> > >> Vlad - does the substance slightly charge in the SEM?
> > >>
> > >> Dave
> > >>
> > >> On Wed, Dec 9, 2015 at 5:46 PM, Steve Gregory <[log in to unmask]>
> > >> wrote:
> > >>
> > >>> Hi Dave and Vlad,
> > >>>
> > >>> I have it up here:
> > >>>
> > >>> http://stevezeva.homestead.com/What_else_it_can_be.pdf
> > >>>
> > >>> Steve
> > >>>
> > >>> On Wed, Dec 9, 2015 at 4:34 PM, David Hillman <
> > >>> [log in to unmask]> wrote:
> > >>>
> > >>>> HI Vlad - we can't open Dropbox here due to firewall
> > >>>> restrictions so can
> > >>>> you have Steve G. post the pictures?
> > >>>>
> > >>>> Dave Hillman
> > >>>> Rockwell Collins
> > >>>> [log in to unmask]
> > >>>>
> > >>>> On Wed, Dec 9, 2015 at 4:59 PM, Vladimir Igoshev <
> > >>>> [log in to unmask]
> > >>>>> wrote:
> > >>>>
> > >>>>> HI everyone,
> > >>>>>
> > >>>>> I'm attaching a link to a file showing something I'd appreciate
> > >>>>> your
> > >>>>> thoughts on. It's a cross-section of a QFN on an IAg board;
> > >>>>> Pb-free/no-clean process. As you can see from the EDS spectrum,
> > >>>>> that
> > >>>>> greyish stuff between pins has pretty much only Sn and O in its
> > >>>> elemental
> > >>>>> composition.
> > >>>>>
> > >>>>> I know there is burn flux residue around solder joints but that
> > >>>>> stuff
> > >>>>> doesn't have any C in it. The question I have is what is it.
> > >>>>>
> > >>>>> I spoke to Bev and both of us are still puzzled.
> > >>>>>
> > >>>>> Here is the link:
> > >>>>>
> > >>>> https://www.dropbox.com/s/3wbj62vqjyhvj2y/What%20else%20it%20can%
> > >>>> 20be.pdf?dl=0
> > >>>>>
> > >>>>> Thank you very much in advance.
> > >>>>>
> > >>>>> Regards,
> > >>>>>
> > >>>>> Vladimir
> > >>>>>
> > >>>>> SENTEC
> > >>>>>
> > >>>>>
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--
Bhanu Sood
Tel: (202) 468-8449
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