Extraordinary Responsive Rare Earth Magnetic Materials

Personnel

Project Leader(s):
Vitalij Pecharsky

Principal Investigators:
Scott Chumbley, Karl Gschneidner, Jr., Gordon Miller, Vitalij Pecharsky

Postdoctoral Research Associates:
Mahmud Khan, Hui Wang, Junding Zou

Overview

A major goal of this research is to uncover the underlying electronic, atomic and microscopic interactions that result in an extraordinarily strong coupling between the magnetic and crystal lattices and remarkable responsiveness to both strong (temperature and pressure) and weak (magnetic field) stimuli in some rare earth intermetallic materials. It will be achieved by focusing on the state-of-the-art synthesis, processing and characterization, combined with theory, modeling and computations gauged and refined against reliable experimental data.

The following systems have been selected as model candidates: GdNi and other equiatomic RM compounds (R is a rare earth metal and M is a 3d transition metal or a main Group 14 element), RCo2, La(Fe1‑xSix)13 and hydrides La(Fe1‑xSix)13Hy, and R5T4 compounds (T is a main Group 14 element). These materials exhibit a number of diverse and unique properties associated with magnetic ordering alone, magneto-volume, itinerant electron metamagnetic, and magnetic-martensitic transformations, respectively, which may or may not be driven by a reversible breaking and reforming of specific chemical bonds.

Development and validation of phenomenological models of transformations that range from magneto-volume to magnetic-martensitic is another goal, thus guiding future discoveries of material systems exhibiting strong reactions to small changes of magnetic field, with temperature and pressure providing additional sources of stimulation.

Highlights

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Publications

2011
Gschneidner K . 2011. Rare Talents. Technology Review. 114:13. abstract
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Zhong X C; Zhang H; Zou M; Liu Z W; Zeng D C; Gschneidner Karl A Jr; Pecharsky V K . 2011. Influence of Heat Treatment on the Structure and Magnetic Properties of Gd5Sn4 Alloy for Magnetic Refrigeration. Supplemental Proceedings: Materials Processing and Energy Materials. 1:ch 36. abstract
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Zhong X C; Zou M; Zhang H; Liu Z W; Zeng D C; Gschneidner K A; Pecharsky V K . 2011. Crystal structure and magnetic properties of R5Sn4 alloys, where R is Tb, Dy, Ho, and Er. Journal of Applied Physics. 109:07a917. abstract
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Nirmala R; Paudyal D; Pecharsky V K; Gschneidner K A; Nigam A K . 2011. First order transition in Dy5Si3Ge: Transport and thermal properties, and first principles calculations. Journal of Applied Physics. 109:07a923. abstract
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Mudryk Y; Paudyal D; Pecharsky V K; Gschneidner K A . 2011. Magnetic properties of Gd2C: Experiment and first principles calculations. Journal of Applied Physics. 109:07A924. abstract
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Usman I T M; Yates K A; Moore J D; Morrison K; Pecharsky V K; Gschneidner K A; Verhagen T; Aarts J; Zverev V I; Robinson J W A; Witt J D S; Blamire M G; Cohen L F . 2011. Evidence for spin mixing in holmium thin film and crystal samples. Physical Review B. 83:144518. abstract
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Gschneidner Karl A Jr . 2011. Replacing the Rare Earth Intellectual Capital. Magnetic & Business Technology. 10:6. abstract
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Fu H; Zou M; Guo M S; Zheng Q; Zu X T . 2011. Structural, magnetic, and magnetothermal properties of R(2)Co(2)Al (R = Tb, and Dy) compounds. Materials Characterization. 62:451-455. abstract
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Gschneidner Karl A Jr . 2011. The Rare Earth Crisis — The Supply/Demand Situation for 2010-2015. Materials Matters. 6:32-41. abstract
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Khan M; Paudyal D; Mudryk Y; Gschneidner K A; Pecharsky V K . 2011. Use of Stevens coefficients for the prediction of magnetic transitions in pseudobinary R1xR(x)(2) alloys: Application to Tm1-xTbxAl(2). Physical Review B. 83:134437. abstract
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