Microwave-Hydrothermal synthesis of BaTiO3+NiCuZnFe2O4 nanocomposites

Sadhana, K.; Praveena, K.; Bharadwaj, S.R.; Murthy, S. R.

doi:10.1016/j.jallcom.2008.04.104

Cited by 41 publications

(14 citation statements)

References 16 publications

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“…Th e composite of xNi 0.53 Cu 0.12 Zn 0.35 Fe 1.88 O 4 + (1-x)BaTiO 3 were prepared using microwave sintering method at 900°C/30 minutes [90][91][92]. It was found that the sintering temperature and time for Ni 0.3 Cu 0.1 ZnyFe 2 O 4 + BaTiO 3 composite was signifi cant reduced from 22 hours to 30 minutes using microwave process.…”

Section: Microwave Sintering Of Nanocompositesmentioning

confidence: 98%

Role of Microwave Sintering in the Preparation of Ferrites for High Frequency Applications

Bharadwaj¹,

Murthy²

2014

Advanced Sensor and Detection Materials

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It is proven that the microwave sintering method is the truly low temperature method for the preparation of nanocrystalline magnetic oxide materials of diff erent sizes and shapes. Th is method saves time, energy, and cost. Th e materials can be produced in either a batch or continuous process using the said method. Th e key novelty of our work is the use of microwave sintering to dramatically enhance the kinetics of crystallization by one to two orders of magnitude. Th is paper will summarize the results obtained on various systems of soft ferrites, and Garnets (Ni-Cu-Zn ferrites, Mg-Cu-Zn ferrites, Ni-Zn ferrites, Co-Zn ferrites, Mn-Zn ferrites, YIG and GdIG, etc.), which were prepared by using microwave sintering method for various applications such as multilayer chip inductors, high frequency, microwave devices, and multilayered transformer cores, etc. All of these systems were sintered at a low temperature of 900 o C/ 30 minutes. Th e phase identifi cation, crystallinity, and morphology of the prepared powder were characterized by X-ray diff raction and transmission electron microscopy (TEM). Th e ferrites obtained with grain sizes varying from 80 nm to120 nm with high surface area ~ 26.8 m 2 g -1 to 156 m 2 g -1 . Th e performance of the sintered ferrites has been estimated from the studies of dependence of complex permittivity and permeability spectra on the frequency and temperature and it was found that the microwave sintered ferrites show improved dielectric and magnetic properties over conventionally sintered ferrites.

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Section: Microwave Sintering Of Nanocompositesmentioning

confidence: 98%

Role of Microwave Sintering in the Preparation of Ferrites for High Frequency Applications

Bharadwaj¹,

Murthy²

2014

Advanced Sensor and Detection Materials

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“…In addition, the nano-sized BaTiO3 and NiCuZn ferrite powders (40-60 nm) were synthesized at 160 o C for 45 min (Sadhana, Praveena et al, 2009). These xBaTiO3 + (1-x)NiCuZnFe2O4 nano-composites were prepared at different weight percentages.…”

Section: Compositesmentioning

confidence: 99%

Microwave Hydrothermal and Solvothermal Processing of Materials and Compounds

Kharisov¹,

Kharissova²,

Méndez³

2012

The Development and Application of Microwave Heating

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“…Low temperature sintered NiCuZn ferrites are the most universal ferrite materials to produce MLCIs because of their relatively low sintering temperature and high resistivity with good performances in the high frequency range [1][2][3].Typical NiCuZn ferrites with a regular particle size have sintering temperatures above 1000 0 C. The usage of fine powder decreases the sintering temperature of ferrites. Fine powders can be prepared through various wetchemical methods like co-precipitation [4],hydrothermal synthesis [5] and sol-gel processes [6]. Although thecoprecipitation and sol-gel methods are the most popular, theyhave some disadvantages as most of them are highly pH sensitiveand require special attention for complex systems whereas the sol-gel technique requires expensive alkoxide precursor material and stringent process of gel product [7].Among the established synthetic methods, it is still critical tofind simple and cost-effective routes to synthesize nano-crystallineNiCuZn ferrites by using cheap, nontoxic and environmentally benign precursors.…”

Section: Introductionmentioning

confidence: 99%