A comparative study of NiZn ferrites modifiedby the addition of cobalt

Materials Research

S.l. Pereira²  H.-d. Pfannes²  A.a. Mendes Filho¹  L.c.b. De Miranda Pinto¹  M.a. Chíncaro¹ 

[1] ,Universidade Federal de Minas GeraisBelo Horizonte MG ,Brazil

关键词: NiZn ferrites;   

DOI  :  10.1590/S1516-14391999000300020

来源: SciELO

【 摘 要 】

Off-stoichiometric NiZn ferrite was obtained by hydrothermal process and compacted in torus form under different pressures. Two samples A1 and A2 - cobalt doped (0.5 %) were sintered at 1573 K in air atmosphere during 3 h. The magnetic properties were studied by vibrating sample magnetometry, Mössbauer spectroscopy and complex impedanciometry. X-ray diffraction and Hg porosimetry were used in order to determine the average grain size and the type of packing in the samples. Both samples exhibited superparamagnetic behavior in the hysteresis loop. This effect does not agree with Mössbauer results, which were fitted using Normos, a commercial computer program. All samples parameters were compared.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License