Structural, Magnetic, and Magnetocaloric Studies of the Potassium Diphosphate KCrP2O7

• Published in: Journal of superconductivity and novel magnetism 2023-02, Vol.36 (2), p.521-528
• Main Authors: Elouafi, A., Ouahbi, S. El, Ezairi, S., Lmai, F., Tizliouine, A., Lassri, H.
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Condensed Matter Physics; Magnetic Materials; Magnetism; Original Paper; Physics; Physics and Astronomy; Strongly Correlated Systems; Superconductivity
• ISSN: 1557-1939; 1557-1947
• DOI: 10.1007/s10948-022-06481-5

The structural, magnetic, and magnetocaloric characteristics of potassium diphosphate KCrP 2 O 7 were thoroughly investigated. A solid-state reaction method has been employed to synthesize this specimen. The crystalline structure was analyzed employing X-ray diffraction (XRD), infrared, and Raman spectroscopy at around room temperature. Detailed Rietveld refinement analysis reveals that the compound adopts a complex monoclinic structure with the space group P21/c and the lattice parameters: a  = 7.350 Ǻ, b  = 9.9691 Ǻ, and c  = 8.1832 Ǻ. Infrared and Raman spectra were examined and analyzed based on the structural peculiarities of the P 2 O 7 - 4 anion and the (K + , Cr 3+ ) cation. The magnetic measurements exhibit an antiferromagnetic-paramagnetic behavior with a second order magnetic transition near the Néel temperature T N ( T N  = 8.5 K) for KCrP 2 O 7 . Magnetic entropy change (− ∆ S M ) induced by the magnetic field was determined by employing the thermodynamic Maxwell’s relation. At H  = 50 kOe, the - Δ S M Max and RCP (magnetic refrigeration capacity) near T N show a value of 4.4 J·kg −1 ·K −1 and 30.06 J·kg −1 , respectively, for the KCrP 2 O 7 compound.