THE ORIGIN OF THE 'INVAR' EFFECT,

reportActive / Technical Report | Accession Number: AD0415635 | Open PDF

Abstract:

The ideas of two electronic configurations of iron atoms in a f.c.c. lattice are extended to the iron-nickel alloy system. With a reasonable variation of the energy difference of these two configurations with nickel concentration it is shown that invar originates from the thermal ex citation of the configuration with lower atomic volume in opposition to the normal anharmonic source of expansion. The anomalous pressure dependence of the Vurie temperature and the variation of Curie temperature with concentration for alloys containing 30 to 60 Ni are also shown to follow.

Author(s):
Weiss, R. J.
Author Organization(s):
ARMY MATERIALS RESEARCH AGENCY WATERTOWN MA
Descriptive Note:
Technical rept.
Pagination:
0024

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AMRA-TR-63-07, MRL-133
Project Number(s):
DA-PROJ-1H0-24401A110
Monitor Series:
AMRA
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*NICKEL ALLOYS, *IRON ALLOYS, CRYSTAL LATTICES, MOSSBAUER EFFECT, CURIE TEMPERATURE, ELECTRON TRANSITIONS, BRILLOUIN ZONES, ATOMIC ENERGY LEVELS, ANTIFERROMAGNETISM, SELECTION RULES(PHYSICS)
Field(s)/Group(s):
Properties of Metals and Alloys
Report Date:
1963 Jun 01