Formation of nickel-zinc ferrite embedded in a silica xerogel matrix Article

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Overview

abstract

• We report a study using X-ray diffraction, refinement Rietveld, IR absorption spectroscopy and vibrating sample magnetometry of the formation of particles of Ni-Zn ferrites embedded in a xerogel SiO2 matrix. Initial solutions were prepared mixing TEOS, distilled water, ethanol, and three different nitrates: iron, nickel and zinc. A molar ratio H2O:TEOS:Et-OH of 11.66:1.0:4.0 was used in all solutions. Formation of Ni0.5Zn0.5Fe2O4 as well as structural modifications of the SiO2 matrix induced by these particles are discussed. Ni-Zn crystals having dimensions varying from 4 to 16.5 nm have been synthesized by a suitable heat treatment schedule at temperatures varying from 700 to 1100°C. The coercivity values for different heat-treated samples are found in the range 11-193 Oe, which are significantly larger than those presented by bulk Ni-Zn ferrites.

authors

• Martínez Mendoza José Refugio
• Matutes-Aquino J.
• Palomares Sánchez Salvador Antonio
• Ponce-Castañeda S.
• Ruiz Facundo

publication date

• 2002-01-01

funding provided via

• Consejo Nacional de Ciencia y Tecnología: G-25851-E, W-8001  Grant

published in

• Journal of Sol-Gel Science and Technology  Journal

Research

keywords

• Composites; Infrared spectroscopy; Sol-gel; Vibrating sample magnetometry; X-ray diffraction Coercive force; Ferrites; Fourier transform infrared spectroscopy; Heat treatment; Infrared spectroscopy; Metallic matrix composites; Silica; X ray diffraction analysis; Le Bail method; Nickel zinc ferrite; Rietveld refinement; Silica xerogel matrix; Vibrating sample magnetometry; Sol-gels

Identity

Digital Object Identifier (DOI)

• 10.1023/A:1016036910040

Additional Document Info

start page

• 37

end page

• 41

volume

• 25

issue

• 1