Characteristics and synthesis of Cu–Ni ferrite nanopowders by coprecipitation method with ultrasound irradiation

Doh, SJ; Kim, E.B.; Lee, B.H.; Oh, Jeong-Hoon

doi:10.1016/j.jmmm.2003.12.926

Cited by 81 publications

(20 citation statements)

References 2 publications

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“…According to their structure, spinel ferrite has a tetrahedral AͲsite and an octahedral BͲsite in AB 2 O 4 crystal structure [6]. The physical properties of ferrites are strongly affected by the cation distribution among AͲ and BͲ sites making the substituted ions to play the important role in modifying the physical properties [7]. Nickel ferrite has a high resistivity and displays a wide range of magnetic properties including low eddy current loss in alternating current applications, making it particularly useful in the radio frequency range [8 -9].…”

Section: Introductionmentioning

confidence: 99%

Role of Cu2+ substitution on the structural and magnetic properties of Ni-ferrite nanoparticles synthesized by the microwave-combustion method

Elshahawy

Mahmoud

Makhlouf

et al. 2015

Ceramics International

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Section: Introductionmentioning

confidence: 99%

Role of Cu2+ substitution on the structural and magnetic properties of Ni-ferrite nanoparticles synthesized by the microwave-combustion method

Elshahawy

Mahmoud

Makhlouf

et al. 2015

Ceramics International

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“…Moreover, Cu Ferrites have shown enhanced thermal, magnetic and dielectric properties [24,25] and its substi tution with Ni, e.g. Cu 1Àx Ni x Fe 2 O 4 , has lead to EMI shielding ma terials having the maximum reflection loss ( 25 dB) for the composition of x 0.5 [26].…”

Section: Introductionmentioning

confidence: 99%

Magnetic silica:epoxy composites with a nano- and micro-scale control

Crespo

González

Pozuelo

2014

Materials Chemistry and Physics

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This is a postprint version of the following published document:Crespo, M., González, M. y Pozuelo, J. (2014) h i g h l i g h t s g r a p h i c a l a b s t r a c tWe present a strategy that permits the nanoscale and micro scale con trol through a simple protocol. Cu Ni ferrites were prepared into the structure pores if commercial silica with a size control by annealing temperature.Composites with epoxy matrix wereThe reinforcements provided an increase in glass transition temperature and decomposition temperature of the composites.Multiscale composites with magnetic properties were prepared by incorporating Cu Ni nanoferrites filled silica microparticles in an epoxy matrix. The size of the nanoferrites was controlled both by the structure of the silica template and the annealing temperature (700 and 900 C) used during the syn thesis procedure. The ferrite:silica particles prepared at 700 C showed a narrow size distribution close to 8.3 nm with a superparamagnetic behaviour. A less symmetric size distribution was obtained when annealing was performed at 900 C, with diameters ranging from 15 to 80 nm. The reinforcement incorporation increased up to 7 C the glass transition temperature and 30 C the decomposition tem peratures of the composites. The proposed strategy permits the nanoscale control, by the trapping effect of the silica on the magnetic nanoparticles, as well as the control of the micro scale distribution through a simple protocol. These composites could have potential applicability as EMI shielding materials, owing to their magnetic nature, lightweight and enhanced thermal stability.

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“…Por otro lado, el sistema cítrico/citrato H 3 (C 3 H 5 O(COO) 3 )/(C 3 H 5 O(COO) 3 3− ) actúa como suave agente polidentado, utilizado como secuestreno alternativo a los polifosfatos en detergentes (8). La síntesis por quelación permite obtener polvos estabilizados muy finos (nanoestructurados), fácilmente dispersables que pueden ser utilizados como tintas serigráficas o para aplicación inkjet (1).…”

Section: Introductionunclassified

Obtención de pigmentos cerámicos de perovskita CaTiO<sub>3</sub> dopada con cromo y vanadio por descomposición metal-orgánica (MOD)

Gargori¹,

Galindo²,

Cerro³

et al. 2012

Bol. Soc. Esp. Ceram. Vidr.

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En el trabajo se presenta la utilización de una ruta de descomposición metal-orgánica MOD (Metal Organic Decomposition), basada en la formación de quelatos por adición de un ácido policarboxílico (oxálico y cítrico) a una disolución de sales metálicas (usualmente nitratos), en la síntesis de pigmentos cerámicos de perovskita CaTiO 3 dopada con cromo y vanadio. La síntesis MOD permite el desarrollo de tintas cerámicas tipo emulsión a partir de los materiales crudos, de tintas tipo dispersión con los materiales carbonizados nanoestructurados en DEG, así como pigmentos estables en vidriados cuando los tamaños de partícula presentan tamaños y grados de cristalización suficientes. En la perovskita de CaTiO 3 modificada con un 20% de vanadio en la posición del Ti, las tintas con materiales carbonizados dispersados rinden coloraciones naranja adecuadas y la calcinación a 1000ºC produce pigmentos naranja estables frente a los vidriados. Las muestras con acomplejación molar 1,5 con policarboxilatos destacan por sus capacidades pigmentantes. En el caso de la perovskita de CaTiO 3 modificada con un 1% de cromo en la posición del Ti, se obtienen tintas por dispersión de los materiales carbonizados que producen coloraciones rosa adecuados, los materiales carbonizados a 500ºC presentan la cristalización de calcita con picos intensos en oxalatos y materiales amorfos con cítrico, por lo que presentan baja capacidad pigmentante en vidriados. La calcinación a 1000ºC produce rosas estables frente a los vidriados. Las muestras con acomplejación molar 0,25 con policarboxilatos destacan por su capacidad pigmentante.Palabras clave: pigmento cerámico, perovskita, tinta cerámica, descomposición metalorgánica. Ceramic pigments based on chromium and vanadium doped CaTiO 3 perovskite obtained by Metal Organic Decomposition (MOD).The Metal Organic Decomposition (MOD) route based on the chelation of a solution of metallic salts (usually nitrates) by policarboxylic acid (oxalic and citric), applied to the synthesis of ceramic pigments based on chromium and vanadium doped CaTiO 3 perovskite, is presented in this paper. MOD synthesis allows preparing ceramic inks using the raw emulsioned materials directly or the nanostructured charried powders at 500ºC dispersed in DEG, and also stable ceramic pigments in glazes when the particle size and crystallization are sufficiently. In the CaTiO 3 perovskite 20% molar modified with vanadium in the Ti position, ceramic inks using charried powders produce adequate orange shades and the fired powders at 1000ºC produce adequate orange colours in glazes. Samples of 1.5 molar addition of policarboxylic acids show the best pigmenting properties. In the case of CaTiO 3 perovskite 1% molar modified with chromium in the Ti position, ceramic inks using charried powders produce adequate pink shades and the fired powders at 1000ºC produce adequate pink colours in glazes. Samples of 0.25 molar addition of policarboxylic acids show the best pigmenting properties. Vol 51, 6, 343-352, noviembre-Diciembre 2012 iSSn 0366-3...

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Characteristics and synthesis of Cu–Ni ferrite nanopowders by coprecipitation method with ultrasound irradiation

Cited by 81 publications

References 2 publications

Role of Cu2+ substitution on the structural and magnetic properties of Ni-ferrite nanoparticles synthesized by the microwave-combustion method

Role of Cu2+ substitution on the structural and magnetic properties of Ni-ferrite nanoparticles synthesized by the microwave-combustion method

Magnetic silica:epoxy composites with a nano- and micro-scale control

Obtención de pigmentos cerámicos de perovskita CaTiO<sub>3</sub> dopada con cromo y vanadio por descomposición metal-orgánica (MOD)

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