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

Physical Chemistry Chemical Physics, ISSN: 1463-9076, Vol: 21, Issue: 5, Page: 2628-2638
2019
  • 23
    Citations
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  • 5
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    23
    • Citation Indexes
      23
  • Captures
    5

Article Description

This article deals with the magnetic and thermal expansion properties of PrFeSi. 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 T = 390 K, driven by an increase in bond length between iron atoms at 6c sites. The field-dependent behaviour of M below T, and comparatively lower value of coercivity (H) 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 (α = 5.3 × 10 K) operative in the temperature range T = 200-340 K. As a magnetocaloric material, PrFeSi possesses high RCP (87 J kg at μH = 1.5 T), high operating temperature (390 K) and moderate ΔS.

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