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- Newsgroups: sci.physics.fusion
- Path: sparky!uunet!think.com!ames!pacbell.com!tandem!zorch!fusion
- From: Dieter Britz <BRITZ@kemi.aau.dk>
- Subject: RE: What about Yamaguchi?
- Message-ID: <C252709F841F203721@vms2.uni-c.dk>
- Sender: scott@zorch.SF-Bay.ORG (Scott Hazen Mueller)
- Reply-To: Dieter Britz <BRITZ@kemi.aau.dk>
- Organization: Sci.physics.fusion/Mail Gateway
- Date: Thu, 19 Nov 1992 17:44:20 GMT
- Lines: 46
-
-
- Originally-From: blue@nscl01.nscl.msu.edu
-
- >I feel the need for a refresher course on what Yamaguchi's experiment
- >actually involves. In addition to a Pd sandwich with an oxide and a
- >gold side with Pd:D in between there seems to be a rather high ion current
- >applied "perpendicular" to the plane of this sandwich. Is this in
- >vacuum or in liquid? Either way I don't see anything too surprising
- >about an observation that this thing comes apart. Next how is the
- >energy balance determined? I would also like to know what kind of
- >material properties the oxide layer is likely to have. I know that
- >wierd things happen when you form oxide layers on alumnimum, for
- >example, relating to large electric field gradients on thin layers.
- >Does an oxide layer on Pd have similar properties? Next some elementary
- >chemistry would seem to indicate that having an oxide in close contact
- >with a layer loaded with deuterium might lead to an explosive situation.
-
- I doubt that you'll get much real information until a paper comes out - if
- indeed it does. I have the earlier paper, and they used an oxide of manganese,
- calling it "Mn-O", of about 100 A thickness. An interesting point you make,
- Dick, whether this layer's interaction with hydrogen might provide the heat.
- With a quick calculation I make that of the order of 10 microgram MnO2, and
- this might release at most 0.1 J per cm**2. The plate would have to very thin
- to get hot. But if what they say is true (and I have this only from remarks
- dropped here, and a brief report in Nature or Science, I forget), the plate
- was charged from the (D2) gas phase - so I don't see how burning in air could
- do the job. Neither can I see what these layers are supposed to do. There
- seems to be some kind of idea here that after charging the Pd, there is a
- large concentration of deuterons still on its way towards the far end, covered
- with oxide (there is a diagram showing this). After some time, they all make
- it out through, and there is an "explosive gas release". Hm, I don't believe
- this.
- The original paper only inferred the plate temperature from the fact that it
- bent, and that the clour of the gold film went away, i.e. that the Au had
- alloyed with the Pd, and this requires, say the authors, a temp. of 1064 C.
- Market forces are a loony phenomenon anyway; I am not really surprised at a
- change in share values. I watched, with amusement, the exchange value of the
- US$ go up and down like a yoyo, during the recent election campaign. I
- couldn't see why a punchy come-back from one or the other candidate should
- have anything to do with that - but money people are not scientists, are they?
- Scientists, now, they need real evidence, before they make up their minds...
- ----------------------------------------------------------------------------
- Dieter Britz alias britz@kemi.aau.dk
- Kemisk Institut, Aarhus Universitet, 8000 Aarhus C, Denmark.
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