Structural, Magnetic, and Magnetocaloric Properties of La0.67Sr0.33-xKxMn0.95Ni0.05O3 Manganites (x=0.10, 0.125, and 0.15): A-site Doping

Authors：Xie, Zhuojia; Feng, Min; Zou, Zhengguang^*; Jiang, Xinyu; Zhang, Weijian

Source：Journal of Superconductivity and Novel Magnetism, 2023, 36(7-9): 1751-1766.

DOI：10.1007/s10948-023-06617-1

• Magnetism
• Magnetocaloric effect
• Doping
• Curie temperature
• Sol-gel method

Polycrystalline powder samples of La0.67Sr0.33-xKxMn0.95Ni0.05O3 (x = 0.1, 0.125, 0.15) (LSKMNO) were prepared using the sol-gel method (S-G) in this study. The influence of K+ doping was systematically investigated on the lattice structure, morphology, and magnetic and magnetocaloric effect (MCE) of LSKMNO. Through the X-ray diffraction (XRD) to confirm the rhombohedral structure of LSKMNO. The magnetic results showed that the Curie temperature (T-C) and the maximum magnetic entropy change (-Delta S-M(max)) increase with the K+ doping for LSKMNO. The T-C and -Delta S-M(max) for LSKMNO (x = 0.15) were 319 K and 3.59 J/(kg center dot K) when the external magnetic field (H) was 5 T, respectively. Arrott curve and normalized magnetic entropy curve (Delta S-M/Delta S-M(max)-theta) are plotted to prove that LSKMNO undergoes a second order magnetic phase transition at the T-C attachment.

• Institution
  桂林理工大学