Ni-Zn nanoferrite for radar-absorbing material Lima, U R; Nasar, M C [Departamento de Quimica, UFRN, Natal/RN 59078-970 (Brazil)]; Nasar, R.S. [Departamento de Quimica, UFRN, Natal/RN 59078-970 (Brazil)], E-mail: nasar@terra.com.br; Rezende, M C [CTA/IAE, Divisao de Materiais, S. J. Campos/SP 12228-904 (Brazil)]; Araujo, J H [Departamento de Fisica Teorica e Experimental, UFRN, Natal/RN 59078-970 (Brazil)] 36 MATERIALS SCIENCE; ABSORPTION; ARGON; CITRATES; EPOXIDES; FERRITES; HYSTERESIS; MAGNETIZATION; NANOSTRUCTURES; NICKEL COMPOUNDS; OPTIMIZATION; PARTICLE SIZE; PRECURSOR; RADAR; REFLECTIVITY; SCANNING ELECTRON MICROSCOPY; TEMPERATURE RANGE 0400-1000 K; TEMPERATURE RANGE 1000-4000 K; ZINC COMPOUNDS Nanoparticles of nickel-zinc ferrite have been prepared by using the citrate precursor method. According to scanning electron microscopy (SEM), the particle size is nanometric for the powder calcined at 350 {sup o}C/3.5 h. The phase formation has been studied by applying different calcining atmospheres, such as air and argon. Pure Ni-Zn ferrite has been observed when calcined in argon at the temperature of 350 {sup o}C. Hysteresis analyses have been done with magnetization of 53.01 emu/g at 350 {sup o}C and obtaining 84.62 emu/g at 1100 {sup o}C due to an optimization of domains formation at high temperature. Measures of reflectivity of Ni-Zn ferrite/epoxy composite have been obtained below 21% at 350 {sup o}C and above 96% at 1100 {sup o}C with a coercive field of 26.61 Oe. Low value of coercive field increased the mobilization of domains wall and increased the radiation absorption. Available from http://dx.doi.org/10.1016/j.jmmm.2008.01.022;INIS Netherlands 2008-05-15 English Journal Article Journal Name: Journal of Magnetism and Magnetic Materials; Journal Volume: 320; Journal Issue: 10; Other Information: DOI: 10.1016/j.jmmm.2008.01.022; PII: S0304-8853(08)00011-5; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA) Medium: X; Size: page(s) 1666-1670 https://doi.org/10.1016/j.jmmm.2008.01.022 [] 10 320 Journal ID: ISSN 0304-8853; JMMMDC; TRN: NL08S3253005434 NLN 2010-01-01 21122731