A heat-capacity study of the intermetallic compounds R{sub 2}Fe{sub 17}X{sub y} (R = Er, Tm, Gd; X = N, D)

Journal Article · Tue Mar 01 00:00:00 EST 1994 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/20.312349· OSTI ID:37255

Pique, C; Burriel, R ^[1]; Fruchart, D; Isnard, O; Miraglia, S ^[2]

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1. Univ. de Zaragoza-CSIC (Spain). Inst. de Ciencia de Materiales de Aragon
2. CNRS, Grenoble (France). Lab. de Cristallographie

Adiabatic heat-capacity measurements of some of the intermetallic compounds R{sub 2}Fe{sub 17}X{sub y} (R = Er, Tm, Gd; X = N, D) have been performed from 5 K to 350 K. Magnetic ordering phase transitions have been observed at 291.9 K for Er{sub 2}Fe{sub 17} and at 260 K for Tm{sub 2}Fe{sub 17}. The anomalous enthalpy and entropy of these transitions are much smaller than expected in a pure localized model for the magnetic moments. In Tm{sub 2}Fe{sub 17} a spin reorientation phase transition of second order character has been observed at 94 K. Theoretical calculations of the free energy and thermodynamic functions have been developed. In the interstitial compounds Er{sub 2}Fe{sub 17}D{sub 3.4}, Tm{sub 2}Fe{sub 17}D{sub 2.13}, Gd{sub 2}Fe{sub 17}N{sub 2.18} and ER{sub 2}Fe{sub 17}N{sub 2.4} no anomalies have been observed.

• OSTI ID: 37255
• Report Number(s): CONF-930860-; ISSN 0018-9464; TRN: 95:009408
• Journal Information: IEEE Transactions on Magnetics, Vol. 30, Issue 2Pt2; Conference: EMMA `93: 5th European magnetic materials and applications conference, Kosice (Slovakia), 24-27 Aug 1993; Other Information: PBD: Mar 1994
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ERBIUM ALLOYS
INTERSTITIALS
MAGNETIC PROPERTIES
THULIUM ALLOYS
GADOLINIUM ALLOYS
IRON BASE ALLOYS
NITROGEN ADDITIONS
DEUTERIUM
PHASE TRANSFORMATIONS
THERMODYNAMIC PROPERTIES
EXPERIMENTAL DATA