Gd{sub 5}Ni{sub 0.96}Sb{sub 2.04} and Gd{sub 5}Ni{sub 0.71}Bi{sub 2.29}: Crystal structure, magnetic properties and magnetocaloric effect. Structural transformation and magnetic properties of hexagonal Gd{sub 5}Bi{sub 3}

Journal Article · Thu May 15 04:00:00 EDT 2008 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2008.02.002· OSTI ID:21128285

Svitlyk, Volodymyr; Fan, Fei ^[1]; Mozharivskyj, Yurij ^[1]

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1. Department of Chemistry, McMaster University, ABB 423, 1280 Main Street west, Hamilton, Ontario, L8S 4M1 (Canada)

Nickel was successfully introduced into the Gd{sub 5}Sb{sub 3} and Gd{sub 5}Bi{sub 3} binaries to yield the Gd{sub 5}Ni{sub 0.96(1)}Sb{sub 2.04(1)} and Gd{sub 5}Ni{sub 0.71(1)}Bi{sub 2.29(1)} phases. Both Ni-substituted compounds adopt the orthorhombic Yb{sub 5}Sb{sub 3}-type structure. While the Gd{sub 5}Ni{sub 0.71}Bi{sub 2.29} phase is thermodynamically stable at 800 deg. C and decomposes at lower temperatures upon annealing, it can be easily quenched to room temperature by rapid cooling from 800 deg. C. The Gd{sub 5}Ni{sub 0.96}Sb{sub 2.04} phase is found to be thermodynamically stable till room temperature. Through annealing at different temperatures, Gd{sub 5}Bi{sub 3} was proven to undergo the Mn{sub 5}Si{sub 3}-type (LT){r_reversible}Yb{sub 5}Sb{sub 3}-type (HT) transformation reversibly, whereas Gd{sub 5}Sb{sub 3} was found to adopt only the hexagonal Mn{sub 5}Si{sub 3}-type structure. Orthorhombic Gd{sub 5}Ni{sub 0.96}Sb{sub 2.04} and Gd{sub 5}Ni{sub 0.71}Bi{sub 2.29} and low-temperature hexagonal Gd{sub 5}Bi{sub 3} order ferromagnetically at 115, 162 and 112 K, respectively. In Gd{sub 5}Bi{sub 3}, the ferromagnetic ordering is followed by spin reorientation below 64 K. Magnetocaloric effect in terms of {delta}S was evaluated from the magnetization data and found to reach the maximum values of -7.7 J/kgK for Gd{sub 5}Ni{sub 0.96}Sb{sub 2.04} and -5.6 J/kgK for Gd{sub 5}Ni{sub 0.71}Bi{sub 2.29} around their Curie temperatures. - Graphical abstract: Ni substitution of Sb in Gd{sub 5}Sb{sub 3} and Gd{sub 5}Bi{sub 3} leads to the formation of the orthorhombic Yb{sub 5}Sb{sub 3}-type structure for Gd{sub 5}Ni{sub 0.96}Sb{sub 2.04} and stabilizes the orthorhombic bismuthide Gd{sub 5}Ni{sub 0.71}Bi{sub 2.29} to lower temperatures. Magnetic behavior and magnetocaloric effect was studied for hexagonal Mn{sub 5}Si{sub 3}-type Gd{sub 5}Bi{sub 3}, and orthorhombic Gd{sub 5}Ni{sub 0.96}Sb{sub 2.04} and Gd{sub 5}Ni{sub 0.71}Bi{sub 2.29}.

• OSTI ID: 21128285
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 5 Vol. 181; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ANNEALING
ANTIMONIDES
BISMUTH COMPOUNDS
COOLING
CRYSTAL-PHASE TRANSFORMATIONS
CURIE POINT
GADOLINIUM COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIZATION
NICKEL COMPOUNDS
ORTHORHOMBIC LATTICES
SPIN
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 1000-4000 K