K dopant effect on La0.7KxCa0.3-xMnO3 (x=0, 0.05, 0.1) perovskite compounds: the structural, magnetic and magnetocaloric properties

Tekgul A., ÜNLÜ C. G., Sarlar K., KÜÇÜK İ.

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, cilt.31, sa.9, ss.6875-6882, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 31 Sayı: 9
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1007/s10854-020-03249-2
  • Dergi Adı: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Applied Science & Technology Source, Chemical Abstracts Core, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.6875-6882
  • Bursa Uludağ Üniversitesi Adresli: Evet

Özet

La0.7KxCa0.3-xMnO3 (x = 0, 0.05, 0.1) perovskites were prepared by sol-gel method. The K-doped effect was determined by the structural, magnetic, and magnetocaloric properties of the compounds. In the crystal structure of K-doped La0.7Ca0.3MnO3, Mn-O-Mn bond angle slightly increases with K addition. The transition shifts the range of 270-320 K when the K is added in La0.7Ca0.3MnO3. The Curie temperature increases from 251 to 288 K with increasing K amount. The maximum magnetic entropy change was found to be 2.7 J kg(-1) K-1 at 283 K under a magnetic field change of 2 T for the La0.7K0.05Ca0.25MnO3. The relative cooling powers (RCPs) in the La0.7KxCa0.3-xMnO3 (x = 0, 0.05, 0.1) samples were calculated to be 103, 133 and 88 J kg(-1), respectively.