Effects of substitution of chromium and nickel on the magnetic properties of Er/sub 2/Co/sub 17/ and Sm/sub 2/Co/sub 17/

Journal Article · Thu Mar 01 00:00:00 EST 1979 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.326989· OSTI ID:6122194

Satyanarayana, M V; Wallace, W E; Craig, R S

Ternary Er/sub 2/Co/sub 17/- and Sm/sub 2/Co/sub 17/-based alloys in which Co is replaced by Ni or Cr have been studied to ascertain the effect of alloying on their magnetic properties. The systems are single phase for 0< or =x< or =7 in the case of Er/sub 2/Co/sub 17-x/Ni/sub x/ and for 0< or =x< or =2 for the Cr-substituted ternaries. Directions of magnetization, saturation magnetizations (M/sub s/), anisotropy fields and intrinsic coercive forces (/sub I/H/sub C/) are reported for 300 and 78 K along with the measured Curie temperatures (T/sub c/). All systems were found to be uniaxial except Er/sub 2/Co/sub 13.6/Ni/sub 3.4/ which has planar anisotropy. Replacement of Co by Ni or Cr results in a decrease in M/sub s/ and T/sub c/. /sub I/H/sub C/ values for Er/sub 2/Co/sub 17-x/Ni/sub x/ are small at room temperature but increased to approx.4 kOe at 78 K. The /sub I/H/sub C/ values for Cr-containing ternaries rise dramatically between 300 and 78 K, from approx.0 to approx.15 kOe for Er/sub 2/Co/sub 15/Cr/sub 2/ as an example. Anisotropy fields are significantly increased by Cr substituting, reaching in the case of Sm/sub 2/Co/sub 15/Cr/sub 2/ approx.400 kOe at 78 K. Ni is considerably less effective than Cr in enhancing H/sub A/ in these ternaries. At low concentrations Ni decreases anisotropy presumably because it produces shrinkage in the c-spacing and brings the dumbbell cobalts closer together.

• Research Organization: Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
• OSTI ID: 6122194
• Journal Information: J. Appl. Phys.; (United States), Vol. 50:B3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM ALLOYS
MAGNETIC PROPERTIES
COBALT BASE ALLOYS
EUROPIUM ALLOYS
NICKEL ALLOYS
SAMARIUM ALLOYS
ANISOTROPY
CRITICAL FIELD
CURIE POINT
MAGNETIZATION
PHASE STUDIES
ALLOYS
COBALT ALLOYS
MAGNETIC FIELDS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
360102* - Metals &amp; Alloys- Structure &amp; Phase Studies