DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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 (Gd5-xScx)Si1.8Ge2.2 compounds. Replacement of magnetic Gd with non-magnetic Sc in Gd5-xScxSi1.8Ge2.2 increases the ferromagnetic to paramagnetic first order phase transition temperature, TC, with only a minor reduction in MCE when x ≤ 0.2. We also demonstrate that hydrostatic pressure further increases TC and reduces the hysteresis of the first order phase transition in Gd4.8Sc0.2Si1.8Ge2.2 from 7 to 4 K. Temperature-dependent x-ray powder diffraction study of Gd4.8Sc0.2Si1.8Ge2.2 confirms the monoclinic ↔ orthorhombic structural transformation at TC, 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 Gd4.8Sc0.2Si1.8Ge2.2 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, andmore » reduce both the transition temperature and magnetocaloric effect.« less

Authors:
 [1];  [2];  [2];  [3]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Mechanical Engineering
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  3. Ames Lab. and Iowa State Univ., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Materials Science and Engineering
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1415793
Alternate Identifier(s):
OSTI ID: 1549002
Report Number(s):
IS-J-9519
Journal ID: ISSN 1359-6454; PII: S1359645417310297; TRN: US1800852
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 145; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Structural transition; Magnetoresistance; Magnetocaloric

Citation Formats

Rudolph, Kirk, Pathak, Arjun K., Mudryk, Yaroslav, and Pecharsky, Vitalij K. Magnetostructural phase transitions and magnetocaloric effect in (Gd5-xScx)Si1.8Ge2.2. United States: N. p., 2017. Web. doi:10.1016/j.actamat.2017.12.024.
Rudolph, Kirk, Pathak, Arjun K., Mudryk, Yaroslav, & Pecharsky, Vitalij K. Magnetostructural phase transitions and magnetocaloric effect in (Gd5-xScx)Si1.8Ge2.2. United States. https://doi.org/10.1016/j.actamat.2017.12.024
Rudolph, Kirk, Pathak, Arjun K., Mudryk, Yaroslav, and Pecharsky, Vitalij K. Thu . "Magnetostructural phase transitions and magnetocaloric effect in (Gd5-xScx)Si1.8Ge2.2". United States. https://doi.org/10.1016/j.actamat.2017.12.024. https://www.osti.gov/servlets/purl/1415793.
@article{osti_1415793,
title = {Magnetostructural phase transitions and magnetocaloric effect in (Gd5-xScx)Si1.8Ge2.2},
author = {Rudolph, Kirk and Pathak, Arjun K. and Mudryk, Yaroslav and Pecharsky, Vitalij K.},
abstractNote = {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 (Gd5-xScx)Si1.8Ge2.2 compounds. Replacement of magnetic Gd with non-magnetic Sc in Gd5-xScxSi1.8Ge2.2 increases the ferromagnetic to paramagnetic first order phase transition temperature, TC, with only a minor reduction in MCE when x ≤ 0.2. We also demonstrate that hydrostatic pressure further increases TC and reduces the hysteresis of the first order phase transition in Gd4.8Sc0.2Si1.8Ge2.2 from 7 to 4 K. Temperature-dependent x-ray powder diffraction study of Gd4.8Sc0.2Si1.8Ge2.2 confirms the monoclinic ↔ orthorhombic structural transformation at TC, 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 Gd4.8Sc0.2Si1.8Ge2.2 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.},
doi = {10.1016/j.actamat.2017.12.024},
journal = {Acta Materialia},
number = C,
volume = 145,
place = {United States},
year = {Thu Dec 21 00:00:00 EST 2017},
month = {Thu Dec 21 00:00:00 EST 2017}
}

Journal Article:

Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Giant Magnetocaloric Effect in Gd5(Si2Ge2)
journal, June 1997


Magnetic and structural phase diagram of Tb 5 ( Si x Ge 1 x ) 4
journal, February 2002


Evidence of a magnetic glass state in the magnetocaloric material Gd 5 Ge 4
journal, July 2006


Giant magnetoresistance near the magnetostructural transition in Gd5(Si1.8Ge2.2)
journal, December 1998

  • Morellon, L.; Stankiewicz, J.; Garcı́a-Landa, B.
  • Applied Physics Letters, Vol. 73, Issue 23
  • DOI: 10.1063/1.122797

Magnetic-field-induced structural phase transition in Gd 5 ( S i 1.8 Ge 2.2 )
journal, December 1998


New ferromagnetic 5 : 4 compounds in the rare earth silicon and germanium systems
journal, November 1967

  • Holtzberg, F.; Gambino, R. J.; McGuire, T. R.
  • Journal of Physics and Chemistry of Solids, Vol. 28, Issue 11
  • DOI: 10.1016/0022-3697(67)90253-3

Making and Breaking Covalent Bonds across the Magnetic Transition in the Giant Magnetocaloric Material Gd 5 ( Si 2 Ge 2 )
journal, May 2000


Magnetism and magnetocaloric effect in (DyxGd5−x)Si2Ge2 (0⩽x⩽5) compounds
journal, June 2007

  • Nirmala, R.; Kundaliya, Darshan C.; Shinde, S. R.
  • Journal of Applied Physics, Vol. 101, Issue 12
  • DOI: 10.1063/1.2745342

The giant magnetocaloric effect between 190 and 300K in the Gd5SixGe4−x alloys for 1.4⩽x⩽2.2
journal, November 2003

  • Pecharsky, A. O.; Gschneidner, K. A.; Pecharsky, V. K.
  • Journal of Magnetism and Magnetic Materials, Vol. 267, Issue 1
  • DOI: 10.1016/S0304-8853(03)00305-6

Enhancing Magnetic Functionality with Scandium: Breaking Stereotypes in the Design of Rare Earth Materials
journal, April 2017


Magnetothermal properties of single crystal dysprosium
conference, January 2002

  • Chernyshov, A. S.
  • ADVANCES IN CRYOGENIC ENGINEERING: Proceedings of the International Cryogenic Materials Conference - ICMC, AIP Conference Proceedings
  • DOI: 10.1063/1.1472521

The room temperature metastable/stable phase relationships in the pseudo-binary Gd5Si4–Gd5Ge4 system
journal, May 2002


On the determination of the magnetic entropy change in materials with first-order transitions
journal, November 2009

  • Caron, L.; Ou, Z. Q.; Nguyen, T. T.
  • Journal of Magnetism and Magnetic Materials, Vol. 321, Issue 21
  • DOI: 10.1016/j.jmmm.2009.06.086

Magnetocaloric Materials
journal, August 2000


A 3–350 K fast automatic small sample calorimeter
journal, November 1997

  • Pecharsky, V. K.; Moorman, J. O.; Gschneidner, K. A.
  • Review of Scientific Instruments, Vol. 68, Issue 11
  • DOI: 10.1063/1.1148367

X-ray powder diffractometer for in situ structural studies in magnetic fields from 0 to 35 kOe between 2.2 and 315 K
journal, April 2004

  • Holm, Aaron Patrick; Pecharsky, Vitalij K.; Gschneidner, Karl A.
  • Review of Scientific Instruments, Vol. 75, Issue 4
  • DOI: 10.1063/1.1667253

The giant magnetocaloric effect of optimally prepared Gd5Si2Ge2
journal, April 2003

  • Pecharsky, A. O.; Gschneidner, K. A.; Pecharsky, V. K.
  • Journal of Applied Physics, Vol. 93, Issue 8
  • DOI: 10.1063/1.1558210

Barocaloric effect in the magnetocaloric prototype Gd5Si2Ge2
journal, August 2012

  • Yuce, Suheyla; Barrio, Maria; Emre, Baris
  • Applied Physics Letters, Vol. 101, Issue 7
  • DOI: 10.1063/1.4745920

Hydrostatic pressure control of the magnetostructural phase transition in Gd 5 Si 2 Ge 2 single crystals
journal, July 2005


Works referencing / citing this record:

Lanthanum Dilution Effects on the Giant Magnetocaloric Gd 5 Si 1.8 Ge 2.2 Compound
journal, September 2018

  • Andrade, Vivian M.; Belo, João H.; Reis, Mario S.
  • physica status solidi (b), Vol. 255, Issue 10
  • DOI: 10.1002/pssb.201800101

The influence of titanium substitution on the magnetic, magnetocaloric, and magnetoelastic properties of Gd 5 Si 2 Ge 2
journal, August 2018

  • Nikitin, S. A.; Smirnov, A. V.; Ovchenkova, I. A.
  • Journal of Applied Physics, Vol. 124, Issue 8
  • DOI: 10.1063/1.5036723