Study of the Nd{sub 0.7}A{sub 0.3}Mn{sub 1{minus}x}B{sub x}O{sub 3} (A = Pb, Cd; B = Fe, Co, Ni; x = 0, 0.1) phases: Synthesis, characterization, and magnetic properties
The Nd{sub 0.7}A{sub 0.3}Mn{sub 1{minus}x}B{sub x}O{sub 3} (A = Pb, Cd; B = Fe, Co, Ni; x = 0, 0.1) compounds have been synthesized using the sol-gel method and characterized by redox titration and X-ray diffraction. The replacement of manganese ions by Fe, Co or Ni implies a decrease in the ferromagnetic (or metal-insulator) transition temperature. The ZFC magnetization drops to zero at low temperatures, showing a general weakening of the ferromagnetic DE interactions and an increasing contribution of the AFM ones arising by superexchange. Similar effects have been observed in the cadmium phases but substitutions of Fe, Co and Ni cations do not modify the magnetic behavior of these phases. The difference observed between the para-ferromagnetic transition temperature, {Tc}, and the metal-insulator one could be explained because of the appearance of magnetically inhomogeneous regions. Values of magnetoresistance around 70% for the lead compounds have been obtained. From ESR measurements at room temperature for all of the samples, different line widths related to the kind of metals present in the cell and the corresponding {Tc} have been obtained. The line width values are higher for the cadmium phases than those for the lead ones, and within each family, it increases as follows: Ni < Fe < Co.
- Research Organization:
- Univ. del Paris Vasco, Bilbao (ES)
- OSTI ID:
- 20014832
- Journal Information:
- Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 12 Vol. 11; ISSN CMATEX; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
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