[Beowulf] Re: Interesting

Nathan Moore ntmoore at gmail.com
Wed Nov 3 01:16:30 EDT 2010


Diamonds will burn, just like coal.  Also, at surface of the earth pressure,
diamond is (by free-energy calc) the less stable state of carbon, and over
(geologic) time diamond will trend to graphite/coal.  Schroeder's "Thermal
Physics" text talks about this for a few pages.

A friend of mine has a wedding band with a tiny "imperfection" in the stone
- a streak of graphite that you can see with a hand-lens.  It makes the
stone less valuable, but frankly its more interesting than your standard
hunk of glitter.


On Tue, Nov 2, 2010 at 8:19 PM, Lux, Jim (337C) <james.p.lux at jpl.nasa.gov>wrote:

>  Diamonds may be almost forever,
>
> But I would think that fused silica would work almost as well, and is
> substantially less expensive.
>
> If you want something exotic, how about ion implantation of Cr+ or Ti+ ions
> into alumina
>
>
>
> Jim Lux
> +1(818)354-2075
>
> *From:* Peter St. John [mailto:peter.st.john at gmail.com]
> *Sent:* Tuesday, November 02, 2010 5:50 PM
> *To:* Robert G. Brown
> *Cc:* Lux, Jim (337C); beowulf at beowulf.org
>
> *Subject:* Re: [Beowulf] Re: Interesting
>
>
>
> deBeers laser-engraves serial numbers onto their (natural) diamonds (to
> counter the increasing gem quality of artificial diamonds made by, say,
> chemical vapor deposition). So how about laser engraving data onto cheap
> chemical vapor deposition thin diamond slices? (One of the ideas had been to
> make microelectronics substrates from diamond this way, since diamond
> conducts heat better than silicon).
> Peter
>
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Nathan Moore
Associate Professor, Physics
Winona State University
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