Jones,
Interesting.
However, the collossal conductivity claimed by Djurek turned out to be a
collossal disappointment when we and another superconductor lab each
measured two sets of his samples. Perhaps one day he will achieve what he
has claimed, but we saw no evidence of it to this point.
I've passed this on to our magnetics team.
Mark
From: Jones Beene [EMAIL PROTECTED]
Reply-To: [EMAIL PROTECTED]
To: vortex [EMAIL PROTECTED]
Subject: Neel effect OU with flux gate?
Date: Tue, 19 Oct 2004 12:49:31 -0700
To lighten your day, let's start out with a spelling pun...
or as they say in the South... some of that thar fern
spelling, to wit: The Neel effect is in 'grave' need of
attention.
Few on vortex will get it, but in the more likely event that
there are a few experimenters listening with electroplating
skills who wish to discover whether the Neel temperature, or
the related frequency near 100 Ghz, can be exploited in an
overunity flux switching device, here are some
suggestions.
As mentioned previously the Neel temperature is analogous to
the Curie temperature and represents the kinetic motion at
which an antiferromagnetic material becomes paramagnetic.
Some experimenters here have tried the Curie thermo-cycling
technique and found it lacking, of course, which it no doubt
is. But unlike the Curie temperature, the Neel effect can
(probably) produce results in an adiabatic process (in which
no significant heat is gained or lost sequentially by the
system). This is due to the fact that an extremely thin
layer is sufficient to totally shield, and even more
importantly, the frequency range (which substitutes for
temperature) is both narrow and of an energy factor which is
at least 100 times lower than the mid-terahertz range -
which is involved with the Curie technique; where in
addition (with Curie cycling) one must modify a large mass
of material over a wide spread of energies and all that
cycled heat is wasted.
The 100 Ghz frequency, which is the substitute for heating,
may be easier to attain than one realizes due to the fact
that a number of Gunn-type diodes and other solid state
oscillators will reach this range and they would require
minimum circuitry - some just a battery and relay. Less than
a watt should be needed.
Getting hold the ultraconductor-type of material might be
possible also, even if Mark Goldes' firm is not selling any
of it yet.
There is an apparently validated claim that colossal
conductivity of the type which will likely possess, as a
natural consequence of this conductivity, the necessary kind
of antiferromagnetic blocking which is needed for flux
gating, has been discovered and is not really all that
uncommon. Plus it can be manufactured fairly easily: see
Colossal Electric Conductivity in Agdefect Ag5Pb2O6 by
Djurek, et. al. ... the citation:
http://arxiv.org/abs/cond-mat/0310011
In this paper, a ByströmEvers compound which in this case
is a ceramic composed of silver and lead oxide which has
been annealed at 500540 K under flow of electric current -
which results in colossal electric conductivity which they
define as 10^(-9) ohm/cm or about 700% better than
copper, but not as good as the Ultraconductor (TM) of Room
Temperature Superconductors, Inc. at least in their
specifications. Would either of these materials be
antiferromagnetic? Although no precise claims seem to have
been made for this, either should be antiferromagnetic,
according to a least one theory.
In the simplest incarnation of this ByströmEvers compound,
silver and lead are plated in several thin layers onto a
substrate and annealed in air or O2 while passing an
electric current through the material. Afterwards this layer
is connected to an oscillator and physically interposed
between a strong magnet and a coil. Any of the geometries
which have been tried in the past, are feasible like (dare I
mention) the MEG but also more advanced geometries like that
of US Patent #4,006,401 (expired now) of Villasenor de Rivas
which describes what seems like the best design for a flux
gate type transformer.
It is my belief that this thing will work best (if it works
at all) at liquid nitrogen temps, especially for a
continuously running transformer. But just to scope it and
test for robust OU effects, room temperature would be fine.
Once you were convinced of a substantial OU, then anyone
would jump at the chance to apply cryogenics to it, without
much complaint. If there is OU at all, it should be of high
enough COP to carry the parasitic load of cryogenics.
... dream on?
Jones
Half my life's in books' written pages
Live and learn from fools and from sages
You know it's true: All things come back to you
Sing with me, sing for the years
Sing for the laughter and sing for the tears
Sing with me... if it's just for today
Maybe tomorrow the good Lord will take you away...
Dream on, dream on,
Dream yourself a dream come true...
...with apologies to Steven Tyler
