Magnetostructural phase transitions and magnetocaloric effect in (Gd5-xScx)Si1.8Ge2.2

Rudolph, Kirk; Pathak, Arjun K.; Mudryk, Yaroslav; Pecharsky, Vitalij K.

doi:10.1016/j.actamat.2017.12.024

Magnetostructural phase transitions and magnetocaloric effect in (Gd_5-xSc_x)Si_1.8Ge_2.2

Journal Article · Wed Dec 20 23:00:00 EST 2017 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2017.12.024· OSTI ID:1415793

Rudolph, Kirk ^[1]; Pathak, Arjun K. ^[2]; Mudryk, Yaroslav ^[2]; Pecharsky, Vitalij K. ^[3]

Ames Lab. and Iowa State Univ., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Mechanical Engineering
Ames Lab. and Iowa State Univ., Ames, IA (United States)
Ames Lab. and Iowa State Univ., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Materials Science and Engineering

Future advancements in magnetocaloric refrigeration/heat pumping technologies depend on the discovery of new materials that demonstrate large, tunable magnetocaloric effects (MCEs) in the vicinity of coupled magnetic and structural phase transitions that occur reversibly with minimum hysteresis. Here, with this in mind, we investigate phase transitions, microstructure, magnetic, thermal, magnetocaloric, and transport properties of (Gd_5-xSc_x)Si_1.8Ge_2.2 compounds. Replacement of magnetic Gd with non-magnetic Sc in Gd_5-xSc_xSi_1.8Ge_2.2 increases the ferromagnetic to paramagnetic first order phase transition temperature, T_C, with only a minor reduction in MCE when x ≤ 0.2. We also demonstrate that hydrostatic pressure further increases T_C and reduces the hysteresis of the first order phase transition in Gd_4.8Sc_0.2Si_1.8Ge_2.2 from 7 to 4 K. Temperature-dependent x-ray powder diffraction study of Gd_4.8Sc_0.2Si_1.8Ge_2.2 confirms the monoclinic ↔ orthorhombic structural transformation at T_C, in agreement with magnetic, calorimetric, and electrical transport measurements. In addition to the substantial magnetocaloric effect, a large magnetoresistance of ~20% is also observed in Gd_4.8Sc_0.2Si_1.8Ge_2.2 for ΔH = 50 kOe in the vicinity of the magnetostructural transition. Finally, in a drastic reversal of the initial doping behavior further additions of Sc (x > 0.2) suppress formation of the monoclinic phase, change the nature of the transition from first-to second-order, and reduce both the transition temperature and magnetocaloric effect.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1415793

Report Number(s):: IS-J--9519; PII: S1359645417310297

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 145; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

Lanthanum Dilution Effects on the Giant Magnetocaloric Gd ₅ Si _1.8 Ge _2.2 Compound Andrade, Vivian M.; Belo, João H.; Reis, Mario S. physica status solidi (b), Vol. 255, Issue 10 https://doi.org/10.1002/pssb.201800101	journal	September 2018
The influence of titanium substitution on the magnetic, magnetocaloric, and magnetoelastic properties of Gd ₅ Si ₂ Ge ₂ Nikitin, S. A.; Smirnov, A. V.; Ovchenkova, I. A. Journal of Applied Physics, Vol. 124, Issue 8 https://doi.org/10.1063/1.5036723	journal	August 2018

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36 MATERIALS SCIENCE
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