EFFECT OF HYDROGEN ON THE POLYMORPHIC TRANSFORMATION IN YTTERBIUM

Citation
Rr. Nigmatullin et al., EFFECT OF HYDROGEN ON THE POLYMORPHIC TRANSFORMATION IN YTTERBIUM, Russian metallurgy. Metally, (5), 1993, pp. 163-166
Citations number
12
Categorie Soggetti
Metallurgy & Mining
Journal title
ISSN journal
00360295
Issue
5
Year of publication
1993
Pages
163 - 166
Database
ISI
SICI code
0036-0295(1993):5<163:EOHOTP>2.0.ZU;2-S
Abstract
Differential thermal analysis is used for determining the temperatures of polymorphic transformations in ytterbium and in the Yb-YbH2 system . On transition from ytterbium to the solid solution of hydrogen in yt terbium the temperature of the fee --> bce polymorphic transformation decreases from 730+/-5 to 632+/-8 degrees C. The latter is the eutecto id temperature for the Yb-YbH2 system. The temperature of the hcp --> fee polymorphic transformation, irrespective of the hydrogen level, is 310+/-5 degrees C. The region of the solid solution of hydrogen in yt terbium at 632 degrees C is limited to the range H:Yb = 0.25+/-0.05; t he homogeneity region of ytterbium dihydride is limited to the range H :Yb = 1.90+/-0.05.