Calorimetric identification of a eutectoid phase separation in the LaNi sub 5 -H sub 2 system at T approx 350 K

Journal Article · Fri Jun 01 00:00:00 EDT 1990 · Journal of Solid State Chemistry; (USA)

DOI:https://doi.org/10.1016/0022-4596(90)90130-P· OSTI ID:6550556

Post, M L; Murray, J J ^[1]

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1. National Research Council of Canada, Ottawa, Ontario (Canada)

The phase behavior of the LaNi{sub 5}-H{sub 2} system for 305 < T < 430 K and moderate hydrogen pressures has been studied by use of heat-conduction calorimeter to measure the thermal desorption characteristics of hydrides which were prepared in situ. When the initial hydride composition is in the {alpha}-{beta} coexistence range the data show that a eutectoidal phase transition initiates at T {approx} 350 K. There is no evidence for hydride disproportionation during this process. The phase which is eutectoidally formed has the approximate composition LaNi{sub 5}H{sub 3}.

• OSTI ID: 6550556
• Journal Information: Journal of Solid State Chemistry; (USA), Vol. 86:2; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL HYDRIDES
PHASE STUDIES
CALORIMETRY
DATA ANALYSIS
EUTECTOIDS
EXPERIMENTAL DATA
HIGH TEMPERATURE
LANTHANUM
MEASURING INSTRUMENTS
MEASURING METHODS
DATA
ELEMENTS
HYDRIDES
HYDROGEN COMPOUNDS
INFORMATION
METALS
NICKEL COMPOUNDS
NUMERICAL DATA
RARE EARTHS
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
&amp; Refractories- Structure &amp; Phase Studies