Also an interesting material when high thermal conductivity is considered is boron nitride. It is around five times better than copper, comparable to diamond and can be sintered to a ceramic material. Of course the Wiedemann-Franz-Lorenz law doesn't apply here as it is a very good electrical insulator. A boron nitride OCXO would indeed be interesting! :-)
I use certain kinds of boron nitride at work to increase the the thermal conductivity of some plastic materials. Tobias On Sat., 31 Oct. 2020, 03:57 Bruce Griffiths, <[email protected]> wrote: > Not true > The Wiedemann-Franz gives the ratio of the thermal conductivity to > electrical conductivity of a metal: > ( pi^2 / 3 ) * ( (k/e)^2 ) * T > > Bruce > > On 31 October 2020 at 12:49 "Dr. David Kirkby" < > [email protected]> wrote: > > > > > > On Fri, 30 Oct 2020 at 22:17, Luiz Alberto Saba <[email protected]> > wrote: > > > > > My bad... copper is the second, losing only to silver, as a thermal > > > conductor. > > > > > > > I think you are mistaken. Copper is second to silver for *electrical* > > conductivity, but I doubt that is so for thermal conductivity. I think > > diamond, which is a form of carbon, is the best thermal conductor, and > > around 5x better than copper. > > > > Dave > > > > -- > > Dr. David Kirkby, > > Kirkby Microwave Ltd, > > [email protected] > > https://www.kirkbymicrowave.co.uk/ > > Telephone 01621-680100./ +44 1621 680100 > > > > Registered in England & Wales, company number 08914892. > > Registered office: > > Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, > United > > Kingdom > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
