Department of Materials Science and Engineering and Ames Laboratory, Iowa State University, Ames, U.S.A

报告人简介：

Vitalij K. Pecharsky is an Anston Marston Distinguished Professor of Materials Science and Engineering at Iowa State University and field work project leader at the Ames Laboratory of U.S. Department of Energy. He received his Ph.D. in Inorganic Chemistry at Lviv State University in Ukraine in 1979. His research interests include synthesis, structure, experimental thermodynamics, physical and chemical properties of intermetallic compounds containing rare earth metals; anomalous behaviors of 4f-electron systems; magnetostructural phase transformations; physical properties of ultra-pure rare earth metals; caloric materials and systems; mechanochemistry, mechanically induced solid state reactions and mechanochemical transformations.  He published one book, 441 peer reviewed papers, 39 book chapters, and holds 15 patents.  He edited 26 books and is an editor of the Handbook on the Physics and Chemistry of Rare Earths and Journal of Alloys and Compounds, both are published by Elsevier.

报告摘要：

Caloric materials encompass reversible thermal effects triggered in solids by magnetic, electric, and/or stress fields. Taken separately or together, caloric effects are in the foundation of transformative solid-state cooling technologies that have the potential to realize substantial energy savings upon adoption and deployment by heating, ventilation, air conditioning, refrigeration, and gas liquefaction industries.  Successful rollout of caloric cooling technologies is, however, inhibited by the unavailability of high-performing caloric solids. A common feature observed in all materials that exhibit the giant magnetocaloric effect is the coupling of magnetic and elastic effects.  In addition to the interplay between magnetic and lattice entropies, both of which are intrinsic materials’ parameters that in principle can be modelled from first principles, extrinsic parameters, such as microstructure, play a role in controlling  both the magnetostructural transition(s) and magnetocaloric effect.  The role of different control parameters and the potential pathways towards materials exhibiting advanced magnetocaloric effect will be discussed.

Publications:

[1] Guillou, F.; Pathak, A. K.; Paudyal, D.; Pecharsky, V. K.; Nature Communications 9, 2925, (2018).

[2] Gschneidner, K. A.; Pecharsky, V. K.; Tsokol, A. O. ; Reports on Progress in Physics 68(6), 1479, (2005). Pecharsky, V. K.; Gschneidner, K. A.; Advanced Materials 13(9), 683, (2001). Pecharsky, V. K.; Gschneidner, K. A.; Physical Review Letters 78(23), 4494, (1997).

[3] Faehler, S.; Pecharsky, V. K.; MRS Bulletin 43(4), 264, (2018).

[4] Yibole, H.; Pathak, A. K.; Mudryk, Y.; Guillou, F.; Pecharsky, V. K.; Acta Materialia 154, 365, (2018).

[5] Rudolph, K.; Pathak, A. K.; Mudryk, Y.; Pecharsky, V. K.; Acta Materialia 145, 369, (2018).

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