Phys.org: Isotopically enriched cubic boron nitride reveals high thermal conduct
ivity.
[1]https://phys.org/news/2020-01-isotopically-enriched-cubic-boron-nitride.html

   I thought of this invention in 2009.

             Jim Bell

References

   1. https://phys.org/news/2020-01-isotopically-enriched-cubic-boron-nitride.html