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*To*: tesla-at-pupman-dot-com*Subject*: Re: barium titanate doorknob caps/beryllium*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Tue, 24 Apr 2001 16:56:27 -0600*Resent-Date*: Tue, 24 Apr 2001 17:12:29 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <Mc2mJD.A.wKD.Mhg56-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "Dr. Duncan Cadd by way of Terry Fritz <twftesla-at-uswest-dot-net>" <dunckx-at-freeuk-dot-com> Hi Georg, All! >perhaps it is a silly question but why you only want the barium titinate as >a ceramic? If I recall correctly you must use the average dielektrik >constant (you have to pay attention to thickness) if you use different >dieelctrics between two electrodes. IMO you can submerge the BaTi- >powder in something which is also a good insulator, perhaps >paraffin. <snip> Ah, if only it were this simple! Unfortunately when using a composite made by mixing particles with a binder it isn't so easy. I've already made some comments in my reply to Luc's posting, so I'll just give you the formula: Keff = [(a^2 K) + 1 - a^2] / [K - aK + a] where Keff is the effective dielectric constant of the composite, K is the dielectric constant of the pure bulk material and a^3 is the proportion (100% = 1,0) of the composite total volume occupied by material of dielectric constant K (assuming that the K of the "binder" is negligible in comparison). Example: if the binder occupies 10% of the total volume, a^3 = 0,9 and therefore a = cube root (0,9) = 0,965... from which a^2 = 0,932... If then K = 100, Keff = 21,7 :-( I only wish it was otherwise! Dunckx Geek#1113 (G-1)

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