Magnetic and dielectric studies of multiferroic CuO nanoparticles confined to porous glass

Charnaya, E. V.; Lee, M.K.; Tien, Cheng; Pak, V. N.; Formus, D. V.; Pirozerskiĭ, A. L.; Nedbai, A. I.; Ubyĭvovk, E. V.; Барышников, С. В.; Chang, Lo-Yueh

doi:10.1016/j.jmmm.2012.04.046

Cited by 19 publications

(6 citation statements)

References 18 publications

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“…First, the tenorite phase (CuO) normally undergoes transitions at 213 and 230 K, which correspond to the commensurate collinear antiferromagnetic order (AF1) and incommensurate nonlinear spiral antiferromagnetic order (AF2), respectively. 38,[43][44][45] In the case of CuF_20 (CuF_40), the onset temperature of AF1 to AF2 transition begins at 255 (225) K with the maximum transition at 275 (290) K, whereas another transition which corresponds to AF2 to paramagnetic order state is found at 305 (310) K. Similar to our results, paramagnetic to AF1 state of CuO has been observed at 250 K under zero-field condition. 46 The transition is more distinct in the CuF_20 system, which presents similar particle sizes of CuFe 2 O 4 and CuO and a higher percentage of tenorite phase (15%).…”

Section: Magnetic Analysissupporting

confidence: 88%

Single‐phase and binary phase nanogranular ferrites for magnetic hyperthermia application

et al. 2020

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The study demonstrates the performance of heating efficiency in single-phase and binary phase spinel ferrite nanosystems. Ferrimagnetic cobalt ferrite (CoFe 2 O 4) (CFO) and superparamagnetic copper ferrite/copper oxide (CuFe 2 O 4 /CuO) (CuF) nanosystems of different particle sizes were synthesized through a microwave-assisted coprecipitation method. The heating behavior was observed in range of both field amplitudes (8-24 kA/m at 516 kHz) and frequencies (325-973 kHz at 12 kA/m). The heating efficiency was analyzed and compared by means of particle size, magnetization, effective anisotropy constant, and Néel relaxation mechanism. Indeed, the heating rate was maximized in larger ferrite particles with low effective anisotropy constant. Moreover, though the magnetization and effective anisotropy constant of single-phase CoFe 2 O 4 nanoparticles were higher, the binary phase CuFe 2 O 4 /CuO nanosystems of similar crystallite size (28 nm) exhibited superior heating efficiency (4.21°C/s). For a field amplitude and frequency of 24 kA/m and 516 kHz, the heating rate of CuF and CFO ferrites with different crystallite sizes decreased in the order of 4.21 > 2.14 > 0.58 > 0.52°C/s for 29 nm > 25 nm > 12 nm > 15 nm, respectively. The results emphasize that binary phase ferrite nanoparticles are better thermoseeds than the single-phase ferrites for the magnetic hyperthermia application.

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Section: Magnetic Analysissupporting

confidence: 88%

Single‐phase and binary phase nanogranular ferrites for magnetic hyperthermia application

et al. 2020

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“…This type of behaviour has been seen earlier for the CuO nanostructured samples as well as in other oxides and was attributed to the presence of nonstoichiometric defects. 43,44 The ZFC curve shows a peak at around 56 K, which indicates the spin glass behavior at this temperature. The upper inset of Fig.…”

Section: Magnetic Studiesmentioning

confidence: 94%

The synthesis of self-assembled polycrystalline 1-D CuO nanostructures in aqueous medium and a study of their multifunctional features

2014

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“…Charnaya et al have reported no anomalies seen in the real and imaginary parts of permittivity at temperatures corresponding to the boundaries of the straight segments for CuO nanoparticles confined to porous glass [38]. The value of dielectric loss is fairly low rising to about 0.06 for sample S1 and approximately 0.3 for sample S2 with increase in temperature [Figs.…”

Section: Structural Characterization and Morphologymentioning

confidence: 99%

Dielectric and Complex Impedance Spectroscopic studies of Microwave synthesized Cupric Oxide nanoparticles

Bhalerao-Panajkar¹

2023

J. Phys.: Conf. Ser.

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Hexamethylenetetramine (HMT) capped CuO nanoparticles were synthesized by microwave assisted technique. X-ray diffraction analysis confirms the formation of monoclinic single phase of the synthesized particles. The nature of ligand bonding and an estimate of the ligand molecules on the surface of CuO particles were obtained from Fourier Transform Infrared spectroscopy and Thermogravimetric analysis, respectively. Hysteresis measurements performed at 10 and 300 K show both the core-shell nature and the impact of the ligand. Dielectric measurements were performed with a temperature variation of 10 to 325 K and a frequency variation over 126 kHz to 949 kHz range. Broad relaxation peaks, reduction of dielectric constant with size and the presence of anomalies at slight variance to the magnetic transitions observed in bulk material, show signatures of the impact of ligand. Impedance spectroscopic (IS) analysis shows the room temperature impedance to be dominated by grain boundaries and reveals core-shell type of behaviour with conducting grains and insulating grain boundaries. A schematic is proposed with the grain consisting of the ligand capped CuO clusters separated by interfaces/grain boundaries.

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Magnetic and dielectric studies of multiferroic CuO nanoparticles confined to porous glass

Cited by 19 publications

References 18 publications

Single‐phase and binary phase nanogranular ferrites for magnetic hyperthermia application

Single‐phase and binary phase nanogranular ferrites for magnetic hyperthermia application

The synthesis of self-assembled polycrystalline 1-D CuO nanostructures in aqueous medium and a study of their multifunctional features

Dielectric and Complex Impedance Spectroscopic studies of Microwave synthesized Cupric Oxide nanoparticles

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