Infrared, structural and magnetic properties of La0.67Ca0.33MnO3 compound


ADIGUZEL H. İ. , KOLAT V. S. , Gencer H. , SECKIN T. , ATALAY S.

INTERNATIONAL JOURNAL OF MODERN PHYSICS B, cilt.21, ss.43-53, 2007 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 21 Konu: 1
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1142/s0217979207035935
  • Dergi Adı: INTERNATIONAL JOURNAL OF MODERN PHYSICS B
  • Sayfa Sayıları: ss.43-53

Özet

La-0:67 Ca-0:33 MnO3 samples prepared by polymeric precursor route method are investigated using the thermogravimetric, differential thermal analysis, X-ray powder diffraction, scanning electron microscope, infrared spectroscopy and magnetic measurements. The unit cell parameters and grain size for all the samples are re fined using X-ray diffraction and scanning electron microscope. It is observed that the IR bands at about 400 cm 1 is are most likely due to Mn - O - Mn bending mode and the band at 600 cm 1 is the result of the in plane Mn O stretching mode. Magnetization measurements indicated that the Curie temperature increases from 241.3 K for the sample sintered at 600 degrees C to 268.86 K for the sample sintered at 1000 degrees C as a function of sintering temperature. The magnetic entropy change reaches the maximum value of about 4 : 8 J/kg center dot K for the sample sintered at 1150 degrees C at an applied field of 1 T.