[time-nuts] Heated crystal? & Rb tube corrosion (FE-5680A)

Steve . iteration69 at gmail.com
Thu Dec 1 06:16:29 EST 2011


Are you sure its is 130c,  and not 130f?  I can't really cite where i read
it, Maybe the journal of applied physics,  but i was under the impression
that we not want to run an Rb oven much beyond 80c.  Ideally i believe it
was 50c, but the warm up time was a few weeks.

I'd like to know why they need to run so hot


On Thu, Dec 1, 2011 at 6:04 AM, Steve . <iteration69 at gmail.com> wrote:

> Attila,
> Great pictures, by the way.
> My experience with alkaline metal is limited to sodium, potassium and
> lithium.  Mostly sodium, which after a long process is precipitated from
> sodium hydroxide as a reagent. These are all contained in an oven under
> very precise temperature and flow control, as the analytes which are passed
> over change very specific attributes of a cell. These are the results which
> are reported. Eventually the cell fails and the alkaline metal attacks the
> cheaper mounting hardware(even though the oven maintains an argon
> atmosphere).  If not caught in time it will work it's way down the
> thermocouple, under the sheath and in to the support electronics. Rb is
> claimed to be much more active than any of the metals i have experience
> with so i assumed that corrosion was a preliminary sign of low life span.
> For completeness, I maintain the instruments in an environmental
> analytical laboratory. (Sulfur analyzers, CO2, CHN, Calorimeters, ion
> chromatograph, inductive couple plasma mass specs, gas chromatography mass
> spec, organic carbon analyzer.  etc,etc,etc.)
> When i say alkalines i mean alkalies, ie, elements which belong to the
> alkalinity group.  99.9999% or better purity, traceable grade.
> Steve
> On Thu, Dec 1, 2011 at 5:36 AM, Attila Kinali <attila at kinali.ch> wrote:
>> On Thu, 1 Dec 2011 05:19:24 -0500
>> "Steve ." <iteration69 at gmail.com> wrote:
>> > Looking at those pictures with a different mind set, I see now that the
>> > washers are not corroded as I had suspected.  It's amazing how they
>> > resemble badly corroded washers which are so typically found in ovens in
>> > which alkalines have leaked.
>> If you mean "alkaline batteries leaking" with "alkalines leaking",
>> then the corrosion you see there is from something else than
>> alkali metals. In alkaline batteries you have a potpury of different
>> highly reactive stuff. What exactly corrodes what and how is something
>> i cannot tell you, but it's definitly not elemental alkalimetals like
>> you have in Rb cells.
>>                        Attila Kinali
>> --
>> Why does it take years to find the answers to
>> the questions one should have asked long ago?
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