Jump to main content
Jump to site search

Issue 5, 2019
Previous Article Next Article

Effect of Si substitution in ferromagnetic Pr2Fe17: a magnetocaloric material with zero thermal expansion operative at high temperature

Author affiliations

Abstract

This article deals with the magnetic and thermal expansion properties of Pr2Fe16Si. This compound has been well characterized from the structural point of view by analysing X-ray diffraction (XRD) patterns. The temperature dependent behaviour of magnetization (M) and the structural parameters (lattice parameters, unit cell volume) suggest that the compound undergoes a second order phase transition from a paramagnetic to a ferromagnetic state at TC = 390 K, driven by an increase in bond length between iron atoms at 6c sites. The field-dependent behaviour of M below TC, and comparatively lower value of coercivity (Hc) have been explained by the role of Si atoms as pinning centres. In the ferromagnetic phase, the system is found to behave like an inhomogenous mean field system. The study of thermal expansion properties establishes that the compound is a zero thermal expansion material (αv = 5.3 × 10−6 K−1) operative in the temperature range T = 200–340 K. As a magnetocaloric material, Pr2Fe16Si possesses high RCP (87 J kg−1 at μ0H = 1.5 T), high operating temperature (390 K) and moderate |ΔSM|max.

Graphical abstract: Effect of Si substitution in ferromagnetic Pr2Fe17: a magnetocaloric material with zero thermal expansion operative at high temperature

Back to tab navigation

Publication details

The article was received on 06 Oct 2018, accepted on 03 Jan 2019 and first published on 18 Jan 2019


Article type: Paper
DOI: 10.1039/C8CP06222F
Phys. Chem. Chem. Phys., 2019,21, 2628-2638

  •   Request permissions

    Effect of Si substitution in ferromagnetic Pr2Fe17: a magnetocaloric material with zero thermal expansion operative at high temperature

    S. Dan, S. Mukherjee, C. Mazumdar and R. Ranganathan, Phys. Chem. Chem. Phys., 2019, 21, 2628
    DOI: 10.1039/C8CP06222F

Search articles by author

Spotlight

Advertisements