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 Ag–defect Ag5Pb2O6" by Djurek, et. al. ... the citation: http://arxiv.org/abs/cond-mat/0310011
In this paper, a "Byström–Evers compound" which in this case is a ceramic composed of silver and lead oxide which has been annealed at 500–540 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 Byström–Evers 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
