THE VARIATION OF EXCHANGE CONSTANT AND MAGNETOCALORIC EFFECT IN LaFe13-xSix (x=1.6, 1.9 AND 2.2) COMPOUNDS

İZGİ T., KOLAT V. S., GENÇER H., ATALAY S.

INTERNATIONAL JOURNAL OF MODERN PHYSICS B, cilt.25, sa.25, ss.3303-3313, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 25 Sayı: 25
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1142/s0217979211101958
  • Dergi Adı: INTERNATIONAL JOURNAL OF MODERN PHYSICS B
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.3303-3313
  • İnönü Üniversitesi Adresli: Evet

Özet

In this work, we present the variation of exchange constant (J(exc)) and magnetocaloric effect (MCE) in LaFe13-xSix (x = 1.6, 1.9 and 2.2) compounds. NaZn13-type LaFe13-xSix intermetallic compounds were prepared by arc melting in an atmosphere of highly pure argon gas. X-ray results indicated a slight decrease of lattice parameter with increasing Si content. The maximum magnetic entropy change of the LaFe13-xSix (x = 1.6, 1.9 and 2.2) samples decreases with increasing Si contents. Also, the magnetic entropy change was calculated theoretically at various magnetic fields and compared with experimental data. The spin-wave dispersion coefficients (D) and exchange constants (J(exc)) were calculated for the fist time for these samples. It was found that D and J(exc) increase with increasing Si content.