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Title: Structural relationships in rare earth-transition metal hydrides

Several structural types of form AB/sub 2/, AB/sub 3/, A/sub 2/B/sub 7/, and AB/sub 5/ (A = rare earth, B = transition metal) are known to be closely related, with local environments which are very similar among the different compounds. Based on these relationships, we suggest that hydride phases A/sub l/B/sub m/H/sub n/ should be related according to the relationships n(AB/sub 3/) = 1/3n(AB/sub 5/) + 2/3n(AB/sub 2/) and n(A/sub 2/B/sub 7/) = n(AB/sub 5/) + n(AB/sub 2/) where the n(AB/sub m/) are observed hydrogen phase concentrations. It is shown that the phases observed in pressure-composition isotherms for AB/sub 3/ and A/sub 2/B/sub 7/ systems can be understood from this viewpoint. A discussion is given of the maximum hydrogen concentration possible in the compounds having these structure types.
Authors:
; ;
Publication Date:
OSTI Identifier:
6588678
Report Number(s):
CONF-800402-20
Journal ID: ISSN 0022-5088
DOE Contract Number:
W-31-109-ENG-38
Resource Type:
Conference
Resource Relation:
Journal Volume: 74; Journal Issue: 1; Conference: International symposium on the properties and applications of metal hydrides, Colorado Springs, CO, USA, 7 Apr 1980
Research Org:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; HYDRIDES; PHASE STUDIES; RARE EARTH COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; HYDROGEN COMPOUNDS 360102* -- Metals & Alloys-- Structure & Phase Studies