Transformations in titanium dihydride phase

Titanium hydrides TiH1.99, TiH1.89, TiH1.60, and deuteride TiD1.99 were syn thesized and studied using DTA and DSC techniques in the temperature range 80-600 K. The results were compared with the previously reported H-1 NMR da ta for TiH1.99. In addition to the known f.c.c.-f.c.t. transformation at 29 0-300 K, a new transformation of the second kind was found in TiH2-x near 4 50 K. The results obtained do not confirm the appreciable occupancy of octa hedral interstices by hydrogen atoms in titanium hydride. (C) 1999 Internat ional Association for Hydrogen Energy. Published by Elsevier Science Ltd. A ll rights reserved.