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

Steve . iteration69 at gmail.com
Thu Dec 1 06:21:40 EST 2011


Searching for "journal of applied physics Rb oven"  I found an older
document which seconds what I had thought.

http://tinyurl.com/82fupdj

Steve
On Thu, Dec 1, 2011 at 6:16 AM, Steve . <iteration69 at gmail.com> wrote:

> Mangus,
>
> 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
>
> Steve
>
>
>
> 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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>>
>>
>



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