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INFLUENCE OF TITANIUM SUBSTITUTIONS ON THE MAGNETIC PROPERTIES OF Ni-Zn FERRITES

B. Parvatheeswara Rao1, K. H. Rao1, K. Asokan2, O. F. Caltun3,*

Affiliation

  1. Department of Physics, Andhra University, Visakhapatnam 530003, India
  2. Nuclear Science Centre, New Delhi 110067, India
  3. Department of Electricity and Electronics, A.Z. Cuza University, Iasi, Romania

Abstract

Ni-Zn ferrites with chemical formula Ni0.65 Zn0.35+x Fe1.99-2x In0.01Tix O4 where x value ranges from 0.000 to 0.125 in steps of 0.025 have been prepared by standard ceramic process. X-ray patterns confirm single phase cubic spinel structures and a slight modification of the lattice constants. Bulk densities of the samples have been measured by Archimedes method and straddle between 93 and 95% of their theoretical limits. Magnetization and Curie temperature measurements were made on the samples. The samples have resulted relatively higher magnetizations through out the series. However, the variation in magnetization with the substituents’ concentration is minimal initially and thereafter the magnetization decreases with every increasing step of concentration. Curie temperature has been found to decrease by about 25oC with each step of substitution. The results are discussed on the basis of Neel’s molecular field theory taking into account the site preferences of various cations present in the system. Conclusions have been derived at the end towards distribution of ions over the tetrahedral and octahedral sites..

Keywords

Ni-Zn ferrites, Titanium substitutions, Magnetic properties.

Submitted at: April 14, 2004
Accepted at: June 22, 2004

Citation

B. Parvatheeswara Rao, K. H. Rao, K. Asokan, O. F. Caltun, INFLUENCE OF TITANIUM SUBSTITUTIONS ON THE MAGNETIC PROPERTIES OF Ni-Zn FERRITES, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 3, pp. 959-962 (2004)