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6) A question for Chainsaw: the claim that there are no iron-rich spheres before the chips' ignition and then abundant spheres after ignition of the red-grey chips contradicts your claim that they are there all along. I've been inclined to believe they are not there pre-ignition. Am I wrong?
Abundant? How abundant? Has this been quantified in any way, shape or form? I can establish a numerical lower bound for the required abundance of elemental iron in the chip residue if there was a significant thermite reaction, with only one assumption concerning the word "significant":
There was one chip that had a measured energy density of 7.5 kJ/g. As we all know, that
alone proves that more than half the energy output came from some other exotherm reaction(s), and less than half was provided by thermite.
My assumption is: To call a material "thermitic", let's require that the thermite reaction proper provide a "significant" proportion of the total heat - and let's define "significant" as "at least 5%".
In this case, that would be 5% of 7.5 kJ/g = 0.375 kJ/g.
With thermite's maximum energy yield of 3.96 kJ/g, this is equivalent of thermite being at least 9.5% of the chip's mass. The thermite products, Al2O3 + 2 Fe, are 52.3% by weight iron, so we should expect to find more than 5.0% by weight elemental iron in the residue - and almost as much Al-oxide.
(In fact, both should be a lot more plentiful, given that the organic matrix that makes up much of the red layer burns off and produces gases that escape the residue.)
It appears to me that they found at best traces of elemental iron. The ATM paper shows exactly one (1) microparticle which
may be partially reduced iron oxide. I see no evidence at all that spheres, iron-rich enough to warrant the assumpion that some of the iron oxide therein has been reduced, are "abundant" in the residues.
I wish Ivan were around. I was interested in his experiment but I don't think it went far enough to prove iron-rich microspheres. It was a work in progress, worth a look-see but to my limited view not "admissible" as evidence. I also liked the guy. He sure had a better sense of humor than me!
+1!