[SI-LIST] Re: relative magnetic permeability of tungsten, molybdenum... proving hard to find
- From: "D G" <dgun@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Sat, 08 Nov 2003 03:09:05 +0800
I doubt the differences from 1 will affect any calculations. But just in
case...
I noticed that magnetic susceptibility is more commonly given for metals rather
than permeability. Is there a way to calculate permeability from
susceptibility?
Daniel
From: "Bart Bouma" <bart.bouma@xxxxxxxxx>
> Hi all,
> I'm not a specialist on this too, but some materials are used in MLCCs.
>
> This is what I wrote to Mark:
>
> " Nickel is a ferro-magnetic metal: these have high permeability values
> (upto 800,000 for alloys)
>
> Gold, copper, silver etc. are diamagnetic materials: relative permeability
> just below 1.
>
> Gold: 0.99996
> Copper: 0.99999
>
> Paramagnetic materials: values for relative permeability also around 1,
> but just above.
> e.g. Palladium is a material belonging to the last category: (Palladium:
> ur = 1.00078)
>
> Sorry, but I didn't find values for molybenum and tungsten, but I think
> (!) that these are either diamagnetic or paramagnetic materials.
> So take ur = 1. "
>
>
> best regards, Bart Bouma
> appl. eng. MLCC & X2Y
> www.yageo.com
>
>
>
>
>
> "Knighten, Jim L" <JK100005@xxxxxxxxxxxxxxxx>
>
> 07-11-03 00:55
> Sent by: si-list-bounce@xxxxxxxxxxxxx
>
> Please respond to JK100005
>
>
> To: mark.walker@xxxxxxxxxxxxxxxx
> si-list@xxxxxxxxxxxxx
> cc:
> Subject: [SI-LIST] Re: relative magnetic permeability of
> tungsten, molybde num...
> proving hard to find
> Category:
>
>
>
> Mark,
>
> I'm not an expert, but I think that gold, molybdenum, and tungsten have
> relative permeabilities of 1. I don't believe they are magnetic.
>
> Jim
>
> ________________________
> James L. Knighten, Ph.D.
> Teradata, a division of NCR http://www.ncr.com
> 17095 Via del Campo
> San Diego, CA 92127
> tel: 858-485-2537
> fax: 858-485-3788
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On
> Behalf Of WALKER, Mark
> Sent: Thursday, November 06, 2003 9:11 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] relative magnetic permeability of tungsten,
> molybdenum...
> proving hard to find
>
>
> All, can you help me out with the relative magnetic permeability of a few
> conductors?
>
> I've spent most of the afternoon using google and searching through the
> numerous engineering, physics & chemistry handbooks in our library, all to
> no avail. I'm looking at materials used for MCM conductors plus a few
> others
> for comparison, with a view to analysing the effects on multi-gigabit
> serial
> link type signals.
>
> Ideally, I'd like to complete the following list for relative magnetic
> permeability, Ur:
>
> copper, Ur = 1.
> gold
> molybdenum
> tungsten
> nickel, Ur in the range 5 to 20 (assume 10) at 1 GHz (see Johnson &
> Graham,
> black magic 2, p267).
>
> However, even if such figures are forthcoming, are they close enough to
> the
> paste like compounds used for MCM conductors?
>
> Cheers,
> Mark.
>
> Stevenage,
> England.
--
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