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Bordoni relaxation and magnetic transformation in cerium and cerium-lanthanum alloys

Journal Article:

Abstract

The internal friction in pure cerium and cerium-base alloys with 2.5 and 12 weight percent of lanthanum added at temperature ranging from 4.2 deg up to 77/sup 0/K is described. Amplitude-independent internal friction has been measured with an inverse torsion pendulum with a specimen oscillation frequency of 1-30 hz in vacuum not less than 1.10/sup -5/ torr. A temperature of the specimen has been determined with a capacitance-type sensor and a gas gage. A curve showing the dependence of internal friction upon a temperature of pure cerium has two distinct peaks; the first at 12.5/sup 0/K, the second at 45/sup 0/K. The 12.5/sup 0/K peak is accounted for by a transition of antiferromagnetic ..beta..-Ce into a paramagnetic state. The 45/sup 0/K peak is a Bordoni maximum. The paper describes an influence of additions, specimen oscillation frequency variations, deformation and annealing upon the peak behavor. Added lanthanum reduces not only a peak temperature but a height as well. Studies of the 45/sup 0/K peak have shown that its temperature location depends upon the specimen oscillation frequency. As the frequency increases the peak tends to a range of high temperatures which confirms its relaxation nature.
Publication Date:
Nov 01, 1975
Product Type:
Journal Article
Reference Number:
AIX-09-367268; EDB-78-080002
Resource Relation:
Journal Name: Fiz. Khim. Obrab. Mater.; (USSR); Journal Volume: 6
Subject:
36 MATERIALS SCIENCE; CERIUM; INTERNAL FRICTION; CERIUM ALLOYS; LANTHANUM ALLOYS; ACTIVATION ENERGY; ANNEALING; ANTIFERROMAGNETISM; BORDONI PEAK; LOW TEMPERATURE; PARAMAGNETISM; PHASE TRANSFORMATIONS; STRESS RELAXATION; TEMPERATURE DEPENDENCE; ULTRALOW TEMPERATURE; VERY LOW TEMPERATURE; ALLOYS; ELEMENTS; ENERGY; FRICTION; HEAT TREATMENTS; MAGNETISM; METALS; RARE EARTH ALLOYS; RARE EARTHS; 360104* - Metals & Alloys- Physical Properties
OSTI ID:
5004903
Country of Origin:
USSR
Language:
Russian
Other Identifying Numbers:
Journal ID: CODEN: FKOMA
Submitting Site:
INIS
Size:
Pages: 97-100
Announcement Date:
Apr 01, 1978

Journal Article:

Citation Formats

Postnikov, V S, Polner, G L, and Sharshakov, I M. Bordoni relaxation and magnetic transformation in cerium and cerium-lanthanum alloys. USSR: N. p., 1975. Web.
Postnikov, V S, Polner, G L, & Sharshakov, I M. Bordoni relaxation and magnetic transformation in cerium and cerium-lanthanum alloys. USSR.
Postnikov, V S, Polner, G L, and Sharshakov, I M. 1975. "Bordoni relaxation and magnetic transformation in cerium and cerium-lanthanum alloys." USSR.
@misc{etde_5004903,
title = {Bordoni relaxation and magnetic transformation in cerium and cerium-lanthanum alloys}
author = {Postnikov, V S, Polner, G L, and Sharshakov, I M}
abstractNote = {The internal friction in pure cerium and cerium-base alloys with 2.5 and 12 weight percent of lanthanum added at temperature ranging from 4.2 deg up to 77/sup 0/K is described. Amplitude-independent internal friction has been measured with an inverse torsion pendulum with a specimen oscillation frequency of 1-30 hz in vacuum not less than 1.10/sup -5/ torr. A temperature of the specimen has been determined with a capacitance-type sensor and a gas gage. A curve showing the dependence of internal friction upon a temperature of pure cerium has two distinct peaks; the first at 12.5/sup 0/K, the second at 45/sup 0/K. The 12.5/sup 0/K peak is accounted for by a transition of antiferromagnetic ..beta..-Ce into a paramagnetic state. The 45/sup 0/K peak is a Bordoni maximum. The paper describes an influence of additions, specimen oscillation frequency variations, deformation and annealing upon the peak behavor. Added lanthanum reduces not only a peak temperature but a height as well. Studies of the 45/sup 0/K peak have shown that its temperature location depends upon the specimen oscillation frequency. As the frequency increases the peak tends to a range of high temperatures which confirms its relaxation nature.}
journal = {Fiz. Khim. Obrab. Mater.; (USSR)}
volume = {6}
journal type = {AC}
place = {USSR}
year = {1975}
month = {Nov}
}