Dielectric properties of Mn-substituted Ni–Zn ferrites

Singh, Amarendra K.; Goel, T. C.; Mendiratta, R. G.; Thakur, O. P.; Prakash, Chandra

doi:10.1063/1.1470256

Cited by 215 publications

(57 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ɛ r increases with the increase in sintering temperature in antiferroelectric region, but depolarization temperature (T d ) increases below 1,160°C then decreases at higher temperature in the system(in Table 1). ɛ r of any material, in general, is influenced by dipolar, electronic, ionic and interfacial polarizations [10]. Interfacial polarization increases due to the creation of crystal defects, and dipolar polarization decreases due to the increase in randomness of the dipoles with temperature.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and electrical properties of the rare-earth doped 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 piezoelectric ceramics

Fan

Liu

2007

J Electroceram

View full text Add to dashboard Cite

Phase structure, microstructure, piezoelectric and dielectric properties of the 0.4 wt% Ce doped 0.94Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 (Ce-BNT6BT) ceramics sintered at different temperatures have been investigated. The powder X-ray diffraction patterns showed that all of the Ce-BNT6BT ceramics exhibited a single perovskite structure with the coexistence of the rhombohedral and tetragonal phase. The morphologies of inside and outside of the bulk indicated that the different sintering temperatures did not cause the second phase on the inside of bulk. However, the TiO 2 existed on the outside of the bulk due to the Bi 2 O 3 and Na 2 O volatilizing at higher temperature. The ceramics sintered at 1,200°C showed a relatively large remnant polarization (P r ) of about 34.2 μC/cm 2 , and a coercive field (E c ) of about 22.6 kV/cm at room temperature. The permittivity ɛ r of the ceramics increased with the increasing of sintering temperature in antiferroelectric region, the depolarization temperature (T d ) increased below 1,160°C then decreased at higher sintering temperature. The resistivity (ρ) of the Ce-BNT6BT ceramics increased linearly as the sintering temperature increased below 1,180°C, but reduced as the sintering temperature increased further. A maximum value of the ρ was 3.125×10 10 ohm m for the Ce-BNT6BT ceramics sintered at 1,180°C at room temperature.

show abstract

Section: Resultsmentioning

confidence: 99%

Microstructure and electrical properties of the rare-earth doped 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 piezoelectric ceramics

Fan

Liu

2007

J Electroceram

View full text Add to dashboard Cite

show abstract

“…The dipolar polarization is temperature dependant; decreases with rise in temperature whereas the interfacial polarization is frequency dependent and decreases with rise in the frequency. Interfacial polarization increases due to creation of crystal defects [18,19].…”

Section: Temperature Dependencementioning

confidence: 99%

Effect of Ba2+ – Sr2+ co-substitution on the structural and dielectric properties of Lead Titanate

Bardapurkar¹,

Barde²,

Thakur

et al. 2012

J Electroceram

View full text Add to dashboard Cite

Growing interest in developing new materials for device applications led to study of ferroelectric oxides in a wide range and variety of compositions. In the present work, polycrystalline samples of lead barium strontium titanate (Pb 1-x Ba 0.5x Sr 0.5x TiO 3 ) solid solution system have been synthesized. Phase formation studies and crystal structure analysis were carried out by X ray diffractometry at room temperature, which suggested formation of single phase compound with tetragonal structure up to x00.8 and cubic structure for x01.0. The XRD pattern has been analyzed by employing Rietveld method. The phase transition in the system was confirmed by Differential Scanning Calorimetry (DSC). Samples with 0.0≤x≤0.8 are in ferroelectric state whereas with x01.0 is found to be in paraelectric state at room temperature. Co-substitution of Ba 2+ and Sr 2+ into lead titanate shows reduction in anisotropy as well as porosity. The dielectric studies of the system as a function of temperature and frequency were carried out in the range 323 K to 773 K and 100 Hz to 1 MHz respectively. Variation of dielectric constant and loss tangent with temperature shows peaking effect near Curie temperature. Frequency dependant dielectric studies clearly show that the dielectric constant and loss tangent decrease exponentially with increased frequency.

show abstract

“…The increase in the complex permittivity with the treatment temperature is due to the structural and morphologic changes observed. This behaviour occurs for other ferrites [23,24], where an increase in ε′ with the temperature of the heat treatment is observed. The crystallite size of the particles (Figure 3) influences the dielectric response, that is, the increase in the crystallite size, which is maximum for the samples treated at 1050, 1100, 1150 and 1200°C, leads to an increase in the dielectric constant.…”

Section: Electrical and Dielectric Measurementsmentioning

confidence: 88%

Lithium Ferrite: Synthesis, Structural Characterization and Electromagnetic Properties

Teixeira¹,

Graça²,

Valente³

et al. 2017

Magnetic Spinels - Synthesis, Properties and Applications

View full text Add to dashboard Cite

Lithium ferrite (LiFe 5 O 8 ) is a cubic ferrite, belongs to the group of soft ferrite materials with a square hysteresis loop, with high Curie temperature and magnetization. The spinel structure of LiFe 5 O 8 has two crystalline forms: ordered, β-LiFe 5 O 8 (Fd3m space group) and disordered, α-LiFe 5 O 8 (P4 1 32/P4 3 32 space group). It has numerous technological applications in microwave devices, computer memory chip, magnetic recording, radio frequency coil fabrication, transformer cores, rod antennas, magnetic liquids among others. It is also a promising candidate for cathode in rechargeable lithium batteries. In this work, the dc electrical conductivity, the impedance spectroscopy and the magnetization of Li 2 O-Fe 2 O 3 powders, with [Li]/[Fe]=1/5 (mol), heat-treated at several temperatures, are studied and related to their structure and morphology. The structural data were obtained by X-ray diffraction and Raman spectroscopy, and the morphology by scanning electron microscopy. The impedance spectroscopy was analysed in function of temperature and frequency, and it was observed that the dielectric properties are highly dependent on the microstructure of the samples. The dc magnetic susceptibility was recorded with a vibrating sample magnetometer, under zero field cooled and field cooled sequences, between 5-300 K. Typical hysteresis curves were obtained and the saturation magnetization increases with increase in heat-treatment temperature.

show abstract

Dielectric properties of Mn-substituted Ni–Zn ferrites

Cited by 215 publications

References 14 publications

Microstructure and electrical properties of the rare-earth doped 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 piezoelectric ceramics

Microstructure and electrical properties of the rare-earth doped 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 piezoelectric ceramics

Effect of Ba2+ – Sr2+ co-substitution on the structural and dielectric properties of Lead Titanate

Lithium Ferrite: Synthesis, Structural Characterization and Electromagnetic Properties

Contact Info

Product

Resources

About