Hello Ross For this purpose you can use annealed (1573K, 3h, in air) CeO2 (D. Balzar et al., J. Appl. Cryst. 37 (2004), 911-924), which is by far cheaper than the NIST standard, I suppose.
Regards Franz -- GMX FreeMail: 1 GB Postfach, 5 E-Mail-Adressen, 10 Free SMS. Alle Infos und kostenlose Anmeldung: http://www.gmx.net/de/go/freemail
